diff --git a/material/assets/javascripts/bundle.65b5374b.min.js b/material/assets/javascripts/bundle.65b5374b.min.js
new file mode 100644
index 000000000..55a1014c3
--- /dev/null
+++ b/material/assets/javascripts/bundle.65b5374b.min.js
@@ -0,0 +1,9 @@
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+ */
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new file mode 100644
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Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }\n\n/**\n * Base class which takes one or more elements, adds event listeners to them,\n * and instantiates a new `ClipboardAction` on each click.\n */\nvar Clipboard = function (_Emitter) {\n    _inherits(Clipboard, _Emitter);\n\n    /**\n     * @param {String|HTMLElement|HTMLCollection|NodeList} trigger\n     * @param {Object} options\n     */\n    function Clipboard(trigger, options) {\n        _classCallCheck(this, Clipboard);\n\n        var _this = _possibleConstructorReturn(this, (Clipboard.__proto__ || Object.getPrototypeOf(Clipboard)).call(this));\n\n        _this.resolveOptions(options);\n        _this.listenClick(trigger);\n        return _this;\n    }\n\n    /**\n     * Defines if attributes would be resolved using internal setter functions\n     * or custom functions that were passed in the constructor.\n     * @param {Object} options\n     */\n\n\n    _createClass(Clipboard, [{\n        key: 'resolveOptions',\n        value: function resolveOptions() {\n            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n            this.action = typeof options.action === 'function' ? options.action : this.defaultAction;\n            this.target = typeof options.target === 'function' ? options.target : this.defaultTarget;\n            this.text = typeof options.text === 'function' ? options.text : this.defaultText;\n            this.container = _typeof(options.container) === 'object' ? options.container : document.body;\n        }\n\n        /**\n         * Adds a click event listener to the passed trigger.\n         * @param {String|HTMLElement|HTMLCollection|NodeList} trigger\n         */\n\n    }, {\n        key: 'listenClick',\n        value: function listenClick(trigger) {\n            var _this2 = this;\n\n            this.listener = (0, _goodListener2.default)(trigger, 'click', function (e) {\n                return _this2.onClick(e);\n            });\n        }\n\n        /**\n         * Defines a new `ClipboardAction` on each click event.\n         * @param {Event} e\n         */\n\n    }, {\n        key: 'onClick',\n        value: function onClick(e) {\n            var trigger = e.delegateTarget || e.currentTarget;\n\n            if (this.clipboardAction) {\n                this.clipboardAction = null;\n            }\n\n            this.clipboardAction = new _clipboardAction2.default({\n                action: this.action(trigger),\n                target: this.target(trigger),\n                text: this.text(trigger),\n                container: this.container,\n                trigger: trigger,\n                emitter: this\n            });\n        }\n\n        /**\n         * Default `action` lookup function.\n         * @param {Element} trigger\n         */\n\n    }, {\n        key: 'defaultAction',\n        value: function defaultAction(trigger) {\n            return getAttributeValue('action', trigger);\n        }\n\n        /**\n         * Default `target` lookup function.\n         * @param {Element} trigger\n         */\n\n    }, {\n        key: 'defaultTarget',\n        value: function defaultTarget(trigger) {\n            var selector = getAttributeValue('target', trigger);\n\n            if (selector) {\n                return document.querySelector(selector);\n            }\n        }\n\n        /**\n         * Returns the support of the given action, or all actions if no action is\n         * given.\n         * @param {String} [action]\n         */\n\n    }, {\n        key: 'defaultText',\n\n\n        /**\n         * Default `text` lookup function.\n         * @param {Element} trigger\n         */\n        value: function defaultText(trigger) {\n            return getAttributeValue('text', trigger);\n        }\n\n        /**\n         * Destroy lifecycle.\n         */\n\n    }, {\n        key: 'destroy',\n        value: function destroy() {\n            this.listener.destroy();\n\n            if (this.clipboardAction) {\n                this.clipboardAction.destroy();\n                this.clipboardAction = null;\n            }\n        }\n    }], [{\n        key: 'isSupported',\n        value: function isSupported() {\n            var action = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : ['copy', 'cut'];\n\n            var actions = typeof action === 'string' ? [action] : action;\n            var support = !!document.queryCommandSupported;\n\n            actions.forEach(function (action) {\n                support = support && !!document.queryCommandSupported(action);\n            });\n\n            return support;\n        }\n    }]);\n\n    return Clipboard;\n}(_tinyEmitter2.default);\n\n/**\n * Helper function to retrieve attribute value.\n * @param {String} suffix\n * @param {Element} element\n */\n\n\nfunction getAttributeValue(suffix, element) {\n    var attribute = 'data-clipboard-' + suffix;\n\n    if (!element.hasAttribute(attribute)) {\n        return;\n    }\n\n    return element.getAttribute(attribute);\n}\n\nmodule.exports = Clipboard;\n\n/***/ }),\n/* 1 */\n/***/ (function(module, exports, __webpack_require__) {\n\n\"use strict\";\n\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nvar _select = __webpack_require__(2);\n\nvar _select2 = _interopRequireDefault(_select);\n\nfunction _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\n/**\n * Inner class which performs selection from either `text` or `target`\n * properties and then executes copy or cut operations.\n */\nvar ClipboardAction = function () {\n    /**\n     * @param {Object} options\n     */\n    function ClipboardAction(options) {\n        _classCallCheck(this, ClipboardAction);\n\n        this.resolveOptions(options);\n        this.initSelection();\n    }\n\n    /**\n     * Defines base properties passed from constructor.\n     * @param {Object} options\n     */\n\n\n    _createClass(ClipboardAction, [{\n        key: 'resolveOptions',\n        value: function resolveOptions() {\n            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n            this.action = options.action;\n            this.container = options.container;\n            this.emitter = options.emitter;\n            this.target = options.target;\n            this.text = options.text;\n            this.trigger = options.trigger;\n\n            this.selectedText = '';\n        }\n\n        /**\n         * Decides which selection strategy is going to be applied based\n         * on the existence of `text` and `target` properties.\n         */\n\n    }, {\n        key: 'initSelection',\n        value: function initSelection() {\n            if (this.text) {\n                this.selectFake();\n            } else if (this.target) {\n                this.selectTarget();\n            }\n        }\n\n        /**\n         * Creates a fake textarea element, sets its value from `text` property,\n         * and makes a selection on it.\n         */\n\n    }, {\n        key: 'selectFake',\n        value: function selectFake() {\n            var _this = this;\n\n            var isRTL = document.documentElement.getAttribute('dir') == 'rtl';\n\n            this.removeFake();\n\n            this.fakeHandlerCallback = function () {\n                return _this.removeFake();\n            };\n            this.fakeHandler = this.container.addEventListener('click', this.fakeHandlerCallback) || true;\n\n            this.fakeElem = document.createElement('textarea');\n            // Prevent zooming on iOS\n            this.fakeElem.style.fontSize = '12pt';\n            // Reset box model\n            this.fakeElem.style.border = '0';\n            this.fakeElem.style.padding = '0';\n            this.fakeElem.style.margin = '0';\n            // Move element out of screen horizontally\n            this.fakeElem.style.position = 'absolute';\n            this.fakeElem.style[isRTL ? 'right' : 'left'] = '-9999px';\n            // Move element to the same position vertically\n            var yPosition = window.pageYOffset || document.documentElement.scrollTop;\n            this.fakeElem.style.top = yPosition + 'px';\n\n            this.fakeElem.setAttribute('readonly', '');\n            this.fakeElem.value = this.text;\n\n            this.container.appendChild(this.fakeElem);\n\n            this.selectedText = (0, _select2.default)(this.fakeElem);\n            this.copyText();\n        }\n\n        /**\n         * Only removes the fake element after another click event, that way\n         * a user can hit `Ctrl+C` to copy because selection still exists.\n         */\n\n    }, {\n        key: 'removeFake',\n        value: function removeFake() {\n            if (this.fakeHandler) {\n                this.container.removeEventListener('click', this.fakeHandlerCallback);\n                this.fakeHandler = null;\n                this.fakeHandlerCallback = null;\n            }\n\n            if (this.fakeElem) {\n                this.container.removeChild(this.fakeElem);\n                this.fakeElem = null;\n            }\n        }\n\n        /**\n         * Selects the content from element passed on `target` property.\n         */\n\n    }, {\n        key: 'selectTarget',\n        value: function selectTarget() {\n            this.selectedText = (0, _select2.default)(this.target);\n            this.copyText();\n        }\n\n        /**\n         * Executes the copy operation based on the current selection.\n         */\n\n    }, {\n        key: 'copyText',\n        value: function copyText() {\n            var succeeded = void 0;\n\n            try {\n                succeeded = document.execCommand(this.action);\n            } catch (err) {\n                succeeded = false;\n            }\n\n            this.handleResult(succeeded);\n        }\n\n        /**\n         * Fires an event based on the copy operation result.\n         * @param {Boolean} succeeded\n         */\n\n    }, {\n        key: 'handleResult',\n        value: function handleResult(succeeded) {\n            this.emitter.emit(succeeded ? 'success' : 'error', {\n                action: this.action,\n                text: this.selectedText,\n                trigger: this.trigger,\n                clearSelection: this.clearSelection.bind(this)\n            });\n        }\n\n        /**\n         * Moves focus away from `target` and back to the trigger, removes current selection.\n         */\n\n    }, {\n        key: 'clearSelection',\n        value: function clearSelection() {\n            if (this.trigger) {\n                this.trigger.focus();\n            }\n\n            window.getSelection().removeAllRanges();\n        }\n\n        /**\n         * Sets the `action` to be performed which can be either 'copy' or 'cut'.\n         * @param {String} action\n         */\n\n    }, {\n        key: 'destroy',\n\n\n        /**\n         * Destroy lifecycle.\n         */\n        value: function destroy() {\n            this.removeFake();\n        }\n    }, {\n        key: 'action',\n        set: function set() {\n            var action = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'copy';\n\n            this._action = action;\n\n            if (this._action !== 'copy' && this._action !== 'cut') {\n                throw new Error('Invalid \"action\" value, use either \"copy\" or \"cut\"');\n            }\n        }\n\n        /**\n         * Gets the `action` property.\n         * @return {String}\n         */\n        ,\n        get: function get() {\n            return this._action;\n        }\n\n        /**\n         * Sets the `target` property using an element\n         * that will be have its content copied.\n         * @param {Element} target\n         */\n\n    }, {\n        key: 'target',\n        set: function set(target) {\n            if (target !== undefined) {\n                if (target && (typeof target === 'undefined' ? 'undefined' : _typeof(target)) === 'object' && target.nodeType === 1) {\n                    if (this.action === 'copy' && target.hasAttribute('disabled')) {\n                        throw new Error('Invalid \"target\" attribute. Please use \"readonly\" instead of \"disabled\" attribute');\n                    }\n\n                    if (this.action === 'cut' && (target.hasAttribute('readonly') || target.hasAttribute('disabled'))) {\n                        throw new Error('Invalid \"target\" attribute. You can\\'t cut text from elements with \"readonly\" or \"disabled\" attributes');\n                    }\n\n                    this._target = target;\n                } else {\n                    throw new Error('Invalid \"target\" value, use a valid Element');\n                }\n            }\n        }\n\n        /**\n         * Gets the `target` property.\n         * @return {String|HTMLElement}\n         */\n        ,\n        get: function get() {\n            return this._target;\n        }\n    }]);\n\n    return ClipboardAction;\n}();\n\nmodule.exports = ClipboardAction;\n\n/***/ }),\n/* 2 */\n/***/ (function(module, exports) {\n\nfunction select(element) {\n    var selectedText;\n\n    if (element.nodeName === 'SELECT') {\n        element.focus();\n\n        selectedText = element.value;\n    }\n    else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {\n        var isReadOnly = element.hasAttribute('readonly');\n\n        if (!isReadOnly) {\n            element.setAttribute('readonly', '');\n        }\n\n        element.select();\n        element.setSelectionRange(0, element.value.length);\n\n        if (!isReadOnly) {\n            element.removeAttribute('readonly');\n        }\n\n        selectedText = element.value;\n    }\n    else {\n        if (element.hasAttribute('contenteditable')) {\n            element.focus();\n        }\n\n        var selection = window.getSelection();\n        var range = document.createRange();\n\n        range.selectNodeContents(element);\n        selection.removeAllRanges();\n        selection.addRange(range);\n\n        selectedText = selection.toString();\n    }\n\n    return selectedText;\n}\n\nmodule.exports = select;\n\n\n/***/ }),\n/* 3 */\n/***/ (function(module, exports) {\n\nfunction E () {\n  // Keep this empty so it's easier to inherit from\n  // (via https://github.com/lipsmack from https://github.com/scottcorgan/tiny-emitter/issues/3)\n}\n\nE.prototype = {\n  on: function (name, callback, ctx) {\n    var e = this.e || (this.e = {});\n\n    (e[name] || (e[name] = [])).push({\n      fn: callback,\n      ctx: ctx\n    });\n\n    return this;\n  },\n\n  once: function (name, callback, ctx) {\n    var self = this;\n    function listener () {\n      self.off(name, listener);\n      callback.apply(ctx, arguments);\n    };\n\n    listener._ = callback\n    return this.on(name, listener, ctx);\n  },\n\n  emit: function (name) {\n    var data = [].slice.call(arguments, 1);\n    var evtArr = ((this.e || (this.e = {}))[name] || []).slice();\n    var i = 0;\n    var len = evtArr.length;\n\n    for (i; i < len; i++) {\n      evtArr[i].fn.apply(evtArr[i].ctx, data);\n    }\n\n    return this;\n  },\n\n  off: function (name, callback) {\n    var e = this.e || (this.e = {});\n    var evts = e[name];\n    var liveEvents = [];\n\n    if (evts && callback) {\n      for (var i = 0, len = evts.length; i < len; i++) {\n        if (evts[i].fn !== callback && evts[i].fn._ !== callback)\n          liveEvents.push(evts[i]);\n      }\n    }\n\n    // Remove event from queue to prevent memory leak\n    // Suggested by https://github.com/lazd\n    // Ref: https://github.com/scottcorgan/tiny-emitter/commit/c6ebfaa9bc973b33d110a84a307742b7cf94c953#commitcomment-5024910\n\n    (liveEvents.length)\n      ? e[name] = liveEvents\n      : delete e[name];\n\n    return this;\n  }\n};\n\nmodule.exports = E;\n\n\n/***/ }),\n/* 4 */\n/***/ (function(module, exports, __webpack_require__) {\n\nvar is = __webpack_require__(5);\nvar delegate = __webpack_require__(6);\n\n/**\n * Validates all params and calls the right\n * listener function based on its target type.\n *\n * @param {String|HTMLElement|HTMLCollection|NodeList} target\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listen(target, type, callback) {\n    if (!target && !type && !callback) {\n        throw new Error('Missing required arguments');\n    }\n\n    if (!is.string(type)) {\n        throw new TypeError('Second argument must be a String');\n    }\n\n    if (!is.fn(callback)) {\n        throw new TypeError('Third argument must be a Function');\n    }\n\n    if (is.node(target)) {\n        return listenNode(target, type, callback);\n    }\n    else if (is.nodeList(target)) {\n        return listenNodeList(target, type, callback);\n    }\n    else if (is.string(target)) {\n        return listenSelector(target, type, callback);\n    }\n    else {\n        throw new TypeError('First argument must be a String, HTMLElement, HTMLCollection, or NodeList');\n    }\n}\n\n/**\n * Adds an event listener to a HTML element\n * and returns a remove listener function.\n *\n * @param {HTMLElement} node\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenNode(node, type, callback) {\n    node.addEventListener(type, callback);\n\n    return {\n        destroy: function() {\n            node.removeEventListener(type, callback);\n        }\n    }\n}\n\n/**\n * Add an event listener to a list of HTML elements\n * and returns a remove listener function.\n *\n * @param {NodeList|HTMLCollection} nodeList\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenNodeList(nodeList, type, callback) {\n    Array.prototype.forEach.call(nodeList, function(node) {\n        node.addEventListener(type, callback);\n    });\n\n    return {\n        destroy: function() {\n            Array.prototype.forEach.call(nodeList, function(node) {\n                node.removeEventListener(type, callback);\n            });\n        }\n    }\n}\n\n/**\n * Add an event listener to a selector\n * and returns a remove listener function.\n *\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenSelector(selector, type, callback) {\n    return delegate(document.body, selector, type, callback);\n}\n\nmodule.exports = listen;\n\n\n/***/ }),\n/* 5 */\n/***/ (function(module, exports) {\n\n/**\n * Check if argument is a HTML element.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.node = function(value) {\n    return value !== undefined\n        && value instanceof HTMLElement\n        && value.nodeType === 1;\n};\n\n/**\n * Check if argument is a list of HTML elements.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.nodeList = function(value) {\n    var type = Object.prototype.toString.call(value);\n\n    return value !== undefined\n        && (type === '[object NodeList]' || type === '[object HTMLCollection]')\n        && ('length' in value)\n        && (value.length === 0 || exports.node(value[0]));\n};\n\n/**\n * Check if argument is a string.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.string = function(value) {\n    return typeof value === 'string'\n        || value instanceof String;\n};\n\n/**\n * Check if argument is a function.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.fn = function(value) {\n    var type = Object.prototype.toString.call(value);\n\n    return type === '[object Function]';\n};\n\n\n/***/ }),\n/* 6 */\n/***/ (function(module, exports, __webpack_require__) {\n\nvar closest = __webpack_require__(7);\n\n/**\n * Delegates event to a selector.\n *\n * @param {Element} element\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @param {Boolean} useCapture\n * @return {Object}\n */\nfunction _delegate(element, selector, type, callback, useCapture) {\n    var listenerFn = listener.apply(this, arguments);\n\n    element.addEventListener(type, listenerFn, useCapture);\n\n    return {\n        destroy: function() {\n            element.removeEventListener(type, listenerFn, useCapture);\n        }\n    }\n}\n\n/**\n * Delegates event to a selector.\n *\n * @param {Element|String|Array} [elements]\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @param {Boolean} useCapture\n * @return {Object}\n */\nfunction delegate(elements, selector, type, callback, useCapture) {\n    // Handle the regular Element usage\n    if (typeof elements.addEventListener === 'function') {\n        return _delegate.apply(null, arguments);\n    }\n\n    // Handle Element-less usage, it defaults to global delegation\n    if (typeof type === 'function') {\n        // Use `document` as the first parameter, then apply arguments\n        // This is a short way to .unshift `arguments` without running into deoptimizations\n        return _delegate.bind(null, document).apply(null, arguments);\n    }\n\n    // Handle Selector-based usage\n    if (typeof elements === 'string') {\n        elements = document.querySelectorAll(elements);\n    }\n\n    // Handle Array-like based usage\n    return Array.prototype.map.call(elements, function (element) {\n        return _delegate(element, selector, type, callback, useCapture);\n    });\n}\n\n/**\n * Finds closest match and invokes callback.\n *\n * @param {Element} element\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @return {Function}\n */\nfunction listener(element, selector, type, callback) {\n    return function(e) {\n        e.delegateTarget = closest(e.target, selector);\n\n        if (e.delegateTarget) {\n            callback.call(element, e);\n        }\n    }\n}\n\nmodule.exports = delegate;\n\n\n/***/ }),\n/* 7 */\n/***/ (function(module, exports) {\n\nvar DOCUMENT_NODE_TYPE = 9;\n\n/**\n * A polyfill for Element.matches()\n */\nif (typeof Element !== 'undefined' && !Element.prototype.matches) {\n    var proto = Element.prototype;\n\n    proto.matches = proto.matchesSelector ||\n                    proto.mozMatchesSelector ||\n                    proto.msMatchesSelector ||\n                    proto.oMatchesSelector ||\n                    proto.webkitMatchesSelector;\n}\n\n/**\n * Finds the closest parent that matches a selector.\n *\n * @param {Element} element\n * @param {String} selector\n * @return {Function}\n */\nfunction closest (element, selector) {\n    while (element && element.nodeType !== DOCUMENT_NODE_TYPE) {\n        if (typeof element.matches === 'function' &&\n            element.matches(selector)) {\n          return element;\n        }\n        element = element.parentNode;\n    }\n}\n\nmodule.exports = closest;\n\n\n/***/ })\n/******/ ]);\n});","var g;\n\n// This works in non-strict mode\ng = (function() {\n\treturn this;\n})();\n\ntry {\n\t// This works if eval is allowed (see CSP)\n\tg = g || new Function(\"return this\")();\n} catch (e) {\n\t// This works if the window reference is available\n\tif (typeof window === \"object\") g = window;\n}\n\n// g can still be undefined, but nothing to do about it...\n// We return undefined, instead of nothing here, so it's\n// easier to handle this case. if(!global) { ...}\n\nmodule.exports = g;\n","export default \"/Users/squidfunk/Desktop/General/Sources/mkdocs-material-typescript/material/app.a6040c1b.min.css\";","export default function _isPlaceholder(a) {\n       return a != null && typeof a === 'object' && a['@@functional/placeholder'] === true;\n}","import _isPlaceholder from './_isPlaceholder.js';\n\n/**\n * Optimized internal one-arity curry function.\n *\n * @private\n * @category Function\n * @param {Function} fn The function to curry.\n * @return {Function} The curried function.\n */\nexport default function _curry1(fn) {\n  return function f1(a) {\n    if (arguments.length === 0 || _isPlaceholder(a)) {\n      return f1;\n    } else {\n      return fn.apply(this, arguments);\n    }\n  };\n}","export default function _identity(x) {\n  return x;\n}","import _curry1 from './internal/_curry1.js';\nimport _identity from './internal/_identity.js';\n\n/**\n * A function that does nothing but return the parameter supplied to it. Good\n * as a default or placeholder function.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Function\n * @sig a -> a\n * @param {*} x The value to return.\n * @return {*} The input value, `x`.\n * @example\n *\n *      R.identity(1); //=> 1\n *\n *      const obj = {};\n *      R.identity(obj) === obj; //=> true\n * @symb R.identity(a) = a\n */\nvar identity = /*#__PURE__*/_curry1(_identity);\nexport default identity;","export default function _has(prop, obj) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}","import _has from './_has.js';\n\nvar toString = Object.prototype.toString;\nvar _isArguments = /*#__PURE__*/function () {\n  return toString.call(arguments) === '[object Arguments]' ? function _isArguments(x) {\n    return toString.call(x) === '[object Arguments]';\n  } : function _isArguments(x) {\n    return _has('callee', x);\n  };\n}();\n\nexport default _isArguments;","import _curry1 from './internal/_curry1.js';\nimport _has from './internal/_has.js';\nimport _isArguments from './internal/_isArguments.js';\n\n// cover IE < 9 keys issues\nvar hasEnumBug = ! /*#__PURE__*/{ toString: null }.propertyIsEnumerable('toString');\nvar nonEnumerableProps = ['constructor', 'valueOf', 'isPrototypeOf', 'toString', 'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];\n// Safari bug\nvar hasArgsEnumBug = /*#__PURE__*/function () {\n  'use strict';\n\n  return arguments.propertyIsEnumerable('length');\n}();\n\nvar contains = function contains(list, item) {\n  var idx = 0;\n  while (idx < list.length) {\n    if (list[idx] === item) {\n      return true;\n    }\n    idx += 1;\n  }\n  return false;\n};\n\n/**\n * Returns a list containing the names of all the enumerable own properties of\n * the supplied object.\n * Note that the order of the output array is not guaranteed to be consistent\n * across different JS platforms.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Object\n * @sig {k: v} -> [k]\n * @param {Object} obj The object to extract properties from\n * @return {Array} An array of the object's own properties.\n * @see R.keysIn, R.values\n * @example\n *\n *      R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']\n */\nvar keys = typeof Object.keys === 'function' && !hasArgsEnumBug ? /*#__PURE__*/_curry1(function keys(obj) {\n  return Object(obj) !== obj ? [] : Object.keys(obj);\n}) : /*#__PURE__*/_curry1(function keys(obj) {\n  if (Object(obj) !== obj) {\n    return [];\n  }\n  var prop, nIdx;\n  var ks = [];\n  var checkArgsLength = hasArgsEnumBug && _isArguments(obj);\n  for (prop in obj) {\n    if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {\n      ks[ks.length] = prop;\n    }\n  }\n  if (hasEnumBug) {\n    nIdx = nonEnumerableProps.length - 1;\n    while (nIdx >= 0) {\n      prop = nonEnumerableProps[nIdx];\n      if (_has(prop, obj) && !contains(ks, prop)) {\n        ks[ks.length] = prop;\n      }\n      nIdx -= 1;\n    }\n  }\n  return ks;\n});\nexport default keys;","import _curry1 from './internal/_curry1.js';\nimport keys from './keys.js';\n\n/**\n * Returns a list of all the enumerable own properties of the supplied object.\n * Note that the order of the output array is not guaranteed across different\n * JS platforms.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Object\n * @sig {k: v} -> [v]\n * @param {Object} obj The object to extract values from\n * @return {Array} An array of the values of the object's own properties.\n * @see R.valuesIn, R.keys\n * @example\n *\n *      R.values({a: 1, b: 2, c: 3}); //=> [1, 2, 3]\n */\nvar values = /*#__PURE__*/_curry1(function values(obj) {\n  var props = keys(obj);\n  var len = props.length;\n  var vals = [];\n  var idx = 0;\n  while (idx < len) {\n    vals[idx] = obj[props[idx]];\n    idx += 1;\n  }\n  return vals;\n});\nexport default values;","/*! *****************************************************************************\r\nCopyright (c) Microsoft Corporation. All rights reserved.\r\nLicensed under the Apache License, Version 2.0 (the \"License\"); you may not use\r\nthis file except in compliance with the License. You may obtain a copy of the\r\nLicense at http://www.apache.org/licenses/LICENSE-2.0\r\n\r\nTHIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\r\nKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED\r\nWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,\r\nMERCHANTABLITY OR NON-INFRINGEMENT.\r\n\r\nSee the Apache Version 2.0 License for specific language governing permissions\r\nand limitations under the License.\r\n***************************************************************************** */\r\n/* global Reflect, Promise */\r\n\r\nvar extendStatics = function(d, b) {\r\n    extendStatics = Object.setPrototypeOf ||\r\n        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||\r\n        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };\r\n    return extendStatics(d, b);\r\n};\r\n\r\nexport function __extends(d, b) {\r\n    extendStatics(d, b);\r\n    function __() { this.constructor = d; }\r\n    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());\r\n}\r\n\r\nexport var __assign = function() {\r\n    __assign = Object.assign || function __assign(t) {\r\n        for (var s, i = 1, n = arguments.length; i < n; i++) {\r\n            s = arguments[i];\r\n            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];\r\n        }\r\n        return t;\r\n    }\r\n    return __assign.apply(this, arguments);\r\n}\r\n\r\nexport function __rest(s, e) {\r\n    var t = {};\r\n    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)\r\n        t[p] = s[p];\r\n    if (s != null && typeof Object.getOwnPropertySymbols === \"function\")\r\n        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)\r\n            t[p[i]] = s[p[i]];\r\n    return t;\r\n}\r\n\r\nexport function __decorate(decorators, target, key, desc) {\r\n    var c = arguments.length, r = c < 3 ? target : desc === null ? 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resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }\r\n        step((generator = generator.apply(thisArg, _arguments || [])).next());\r\n    });\r\n}\r\n\r\nexport function __generator(thisArg, body) {\r\n    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;\r\n    return g = { next: verb(0), \"throw\": verb(1), \"return\": verb(2) }, typeof Symbol === \"function\" && (g[Symbol.iterator] = function() { return this; }), g;\r\n    function verb(n) { return function (v) { return step([n, v]); }; }\r\n    function step(op) {\r\n        if (f) throw new TypeError(\"Generator is already executing.\");\r\n        while (_) try {\r\n            if (f = 1, y && (t = op[0] & 2 ? y[\"return\"] : op[0] ? y[\"throw\"] || ((t = y[\"return\"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;\r\n            if (y = 0, t) op = [op[0] & 2, t.value];\r\n            switch (op[0]) {\r\n                case 0: case 1: t = op; break;\r\n                case 4: _.label++; return { value: op[1], done: false };\r\n                case 5: _.label++; y = op[1]; op = [0]; continue;\r\n                case 7: op = _.ops.pop(); _.trys.pop(); continue;\r\n                default:\r\n                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }\r\n                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }\r\n                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }\r\n                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }\r\n                    if (t[2]) _.ops.pop();\r\n                    _.trys.pop(); continue;\r\n            }\r\n            op = body.call(thisArg, _);\r\n        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }\r\n        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };\r\n    }\r\n}\r\n\r\nexport function __exportStar(m, exports) {\r\n    for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];\r\n}\r\n\r\nexport function __values(o) {\r\n    var m = typeof Symbol === \"function\" && o[Symbol.iterator], i = 0;\r\n    if (m) return m.call(o);\r\n    return {\r\n        next: function () {\r\n            if (o && i >= o.length) o = void 0;\r\n            return { value: o && o[i++], done: !o };\r\n        }\r\n    };\r\n}\r\n\r\nexport function __read(o, n) {\r\n    var m = typeof Symbol === \"function\" && o[Symbol.iterator];\r\n    if (!m) return o;\r\n    var i = m.call(o), r, ar = [], e;\r\n    try {\r\n        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);\r\n    }\r\n    catch (error) { e = { error: error }; }\r\n    finally {\r\n        try {\r\n            if (r && !r.done && (m = i[\"return\"])) m.call(i);\r\n        }\r\n        finally { if (e) throw e.error; }\r\n    }\r\n    return ar;\r\n}\r\n\r\nexport function __spread() {\r\n    for (var ar = [], i = 0; i < arguments.length; i++)\r\n        ar = ar.concat(__read(arguments[i]));\r\n    return ar;\r\n}\r\n\r\nexport function __await(v) {\r\n    return this instanceof __await ? (this.v = v, this) : new __await(v);\r\n}\r\n\r\nexport function __asyncGenerator(thisArg, _arguments, generator) {\r\n    if (!Symbol.asyncIterator) throw new TypeError(\"Symbol.asyncIterator is not defined.\");\r\n    var g = generator.apply(thisArg, _arguments || []), i, q = [];\r\n    return i = {}, verb(\"next\"), verb(\"throw\"), verb(\"return\"), i[Symbol.asyncIterator] = function () { return this; }, i;\r\n    function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }\r\n    function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }\r\n    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }\r\n    function fulfill(value) { resume(\"next\", value); }\r\n    function reject(value) { resume(\"throw\", value); }\r\n    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }\r\n}\r\n\r\nexport function __asyncDelegator(o) {\r\n    var i, p;\r\n    return i = {}, verb(\"next\"), verb(\"throw\", function (e) { throw e; }), verb(\"return\"), i[Symbol.iterator] = function () { return this; }, i;\r\n    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === \"return\" } : f ? f(v) : v; } : f; }\r\n}\r\n\r\nexport function __asyncValues(o) {\r\n    if (!Symbol.asyncIterator) throw new TypeError(\"Symbol.asyncIterator is not defined.\");\r\n    var m = o[Symbol.asyncIterator], i;\r\n    return m ? m.call(o) : (o = typeof __values === \"function\" ? __values(o) : o[Symbol.iterator](), i = {}, verb(\"next\"), verb(\"throw\"), verb(\"return\"), i[Symbol.asyncIterator] = function () { return this; }, i);\r\n    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }\r\n    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }\r\n}\r\n\r\nexport function __makeTemplateObject(cooked, raw) {\r\n    if (Object.defineProperty) { Object.defineProperty(cooked, \"raw\", { value: raw }); } else { cooked.raw = raw; }\r\n    return cooked;\r\n};\r\n\r\nexport function __importStar(mod) {\r\n    if (mod && mod.__esModule) return mod;\r\n    var result = {};\r\n    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];\r\n    result.default = mod;\r\n    return result;\r\n}\r\n\r\nexport function __importDefault(mod) {\r\n    return (mod && mod.__esModule) ? mod : { default: mod };\r\n}\r\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isFunction(x) {\n    return typeof x === 'function';\n}\n//# sourceMappingURL=isFunction.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar _enable_super_gross_mode_that_will_cause_bad_things = false;\nexport var config = {\n    Promise: undefined,\n    set useDeprecatedSynchronousErrorHandling(value) {\n        if (value) {\n            var error = /*@__PURE__*/ new Error();\n            /*@__PURE__*/ console.warn('DEPRECATED! RxJS was set to use deprecated synchronous error handling behavior by code at: \\n' + error.stack);\n        }\n        else if (_enable_super_gross_mode_that_will_cause_bad_things) {\n            /*@__PURE__*/ console.log('RxJS: Back to a better error behavior. Thank you. <3');\n        }\n        _enable_super_gross_mode_that_will_cause_bad_things = value;\n    },\n    get useDeprecatedSynchronousErrorHandling() {\n        return _enable_super_gross_mode_that_will_cause_bad_things;\n    },\n};\n//# sourceMappingURL=config.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function hostReportError(err) {\n    setTimeout(function () { throw err; }, 0);\n}\n//# sourceMappingURL=hostReportError.js.map\n","/** PURE_IMPORTS_START _config,_util_hostReportError PURE_IMPORTS_END */\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\nexport var empty = {\n    closed: true,\n    next: function (value) { },\n    error: function (err) {\n        if (config.useDeprecatedSynchronousErrorHandling) {\n            throw err;\n        }\n        else {\n            hostReportError(err);\n        }\n    },\n    complete: function () { }\n};\n//# sourceMappingURL=Observer.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var isArray = /*@__PURE__*/ (function () { return Array.isArray || (function (x) { return x && typeof x.length === 'number'; }); })();\n//# sourceMappingURL=isArray.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isObject(x) {\n    return x !== null && typeof x === 'object';\n}\n//# sourceMappingURL=isObject.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar UnsubscriptionErrorImpl = /*@__PURE__*/ (function () {\n    function UnsubscriptionErrorImpl(errors) {\n        Error.call(this);\n        this.message = errors ?\n            errors.length + \" errors occurred during unsubscription:\\n\" + errors.map(function (err, i) { return i + 1 + \") \" + err.toString(); }).join('\\n  ') : '';\n        this.name = 'UnsubscriptionError';\n        this.errors = errors;\n        return this;\n    }\n    UnsubscriptionErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return UnsubscriptionErrorImpl;\n})();\nexport var UnsubscriptionError = UnsubscriptionErrorImpl;\n//# sourceMappingURL=UnsubscriptionError.js.map\n","/** PURE_IMPORTS_START _util_isArray,_util_isObject,_util_isFunction,_util_UnsubscriptionError PURE_IMPORTS_END */\nimport { isArray } from './util/isArray';\nimport { isObject } from './util/isObject';\nimport { isFunction } from './util/isFunction';\nimport { UnsubscriptionError } from './util/UnsubscriptionError';\nvar Subscription = /*@__PURE__*/ (function () {\n    function Subscription(unsubscribe) {\n        this.closed = false;\n        this._parentOrParents = null;\n        this._subscriptions = null;\n        if (unsubscribe) {\n            this._unsubscribe = unsubscribe;\n        }\n    }\n    Subscription.prototype.unsubscribe = function () {\n        var errors;\n        if (this.closed) {\n            return;\n        }\n        var _a = this, _parentOrParents = _a._parentOrParents, _unsubscribe = _a._unsubscribe, _subscriptions = _a._subscriptions;\n        this.closed = true;\n        this._parentOrParents = null;\n        this._subscriptions = null;\n        if (_parentOrParents instanceof Subscription) {\n            _parentOrParents.remove(this);\n        }\n        else if (_parentOrParents !== null) {\n            for (var index = 0; index < _parentOrParents.length; ++index) {\n                var parent_1 = _parentOrParents[index];\n                parent_1.remove(this);\n            }\n        }\n        if (isFunction(_unsubscribe)) {\n            try {\n                _unsubscribe.call(this);\n            }\n            catch (e) {\n                errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];\n            }\n        }\n        if (isArray(_subscriptions)) {\n            var index = -1;\n            var len = _subscriptions.length;\n            while (++index < len) {\n                var sub = _subscriptions[index];\n                if (isObject(sub)) {\n                    try {\n                        sub.unsubscribe();\n                    }\n                    catch (e) {\n                        errors = errors || [];\n                        if (e instanceof UnsubscriptionError) {\n                            errors = errors.concat(flattenUnsubscriptionErrors(e.errors));\n                        }\n                        else {\n                            errors.push(e);\n                        }\n                    }\n                }\n            }\n        }\n        if (errors) {\n            throw new UnsubscriptionError(errors);\n        }\n    };\n    Subscription.prototype.add = function (teardown) {\n        var subscription = teardown;\n        if (!teardown) {\n            return Subscription.EMPTY;\n        }\n        switch (typeof teardown) {\n            case 'function':\n                subscription = new Subscription(teardown);\n            case 'object':\n                if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {\n                    return subscription;\n                }\n                else if (this.closed) {\n                    subscription.unsubscribe();\n                    return subscription;\n                }\n                else if (!(subscription instanceof Subscription)) {\n                    var tmp = subscription;\n                    subscription = new Subscription();\n                    subscription._subscriptions = [tmp];\n                }\n                break;\n            default: {\n                throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');\n            }\n        }\n        var _parentOrParents = subscription._parentOrParents;\n        if (_parentOrParents === null) {\n            subscription._parentOrParents = this;\n        }\n        else if (_parentOrParents instanceof Subscription) {\n            if (_parentOrParents === this) {\n                return subscription;\n            }\n            subscription._parentOrParents = [_parentOrParents, this];\n        }\n        else if (_parentOrParents.indexOf(this) === -1) {\n            _parentOrParents.push(this);\n        }\n        else {\n            return subscription;\n        }\n        var subscriptions = this._subscriptions;\n        if (subscriptions === null) {\n            this._subscriptions = [subscription];\n        }\n        else {\n            subscriptions.push(subscription);\n        }\n        return subscription;\n    };\n    Subscription.prototype.remove = function (subscription) {\n        var subscriptions = this._subscriptions;\n        if (subscriptions) {\n            var subscriptionIndex = subscriptions.indexOf(subscription);\n            if (subscriptionIndex !== -1) {\n                subscriptions.splice(subscriptionIndex, 1);\n            }\n        }\n    };\n    Subscription.EMPTY = (function (empty) {\n        empty.closed = true;\n        return empty;\n    }(new Subscription()));\n    return Subscription;\n}());\nexport { Subscription };\nfunction flattenUnsubscriptionErrors(errors) {\n    return errors.reduce(function (errs, err) { return errs.concat((err instanceof UnsubscriptionError) ? err.errors : err); }, []);\n}\n//# sourceMappingURL=Subscription.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var rxSubscriber = /*@__PURE__*/ (function () {\n    return typeof Symbol === 'function'\n        ? /*@__PURE__*/ Symbol('rxSubscriber')\n        : '@@rxSubscriber_' + /*@__PURE__*/ Math.random();\n})();\nexport var $$rxSubscriber = rxSubscriber;\n//# sourceMappingURL=rxSubscriber.js.map\n","/** PURE_IMPORTS_START tslib,_util_isFunction,_Observer,_Subscription,_internal_symbol_rxSubscriber,_config,_util_hostReportError PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { isFunction } from './util/isFunction';\nimport { empty as emptyObserver } from './Observer';\nimport { Subscription } from './Subscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\nvar Subscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Subscriber, _super);\n    function Subscriber(destinationOrNext, error, complete) {\n        var _this = _super.call(this) || this;\n        _this.syncErrorValue = null;\n        _this.syncErrorThrown = false;\n        _this.syncErrorThrowable = false;\n        _this.isStopped = false;\n        switch (arguments.length) {\n            case 0:\n                _this.destination = emptyObserver;\n                break;\n            case 1:\n                if (!destinationOrNext) {\n                    _this.destination = emptyObserver;\n                    break;\n                }\n                if (typeof destinationOrNext === 'object') {\n                    if (destinationOrNext instanceof Subscriber) {\n                        _this.syncErrorThrowable = destinationOrNext.syncErrorThrowable;\n                        _this.destination = destinationOrNext;\n                        destinationOrNext.add(_this);\n                    }\n                    else {\n                        _this.syncErrorThrowable = true;\n                        _this.destination = new SafeSubscriber(_this, destinationOrNext);\n                    }\n                    break;\n                }\n            default:\n                _this.syncErrorThrowable = true;\n                _this.destination = new SafeSubscriber(_this, destinationOrNext, error, complete);\n                break;\n        }\n        return _this;\n    }\n    Subscriber.prototype[rxSubscriberSymbol] = function () { return this; };\n    Subscriber.create = function (next, error, complete) {\n        var subscriber = new Subscriber(next, error, complete);\n        subscriber.syncErrorThrowable = false;\n        return subscriber;\n    };\n    Subscriber.prototype.next = function (value) {\n        if (!this.isStopped) {\n            this._next(value);\n        }\n    };\n    Subscriber.prototype.error = function (err) {\n        if (!this.isStopped) {\n            this.isStopped = true;\n            this._error(err);\n        }\n    };\n    Subscriber.prototype.complete = function () {\n        if (!this.isStopped) {\n            this.isStopped = true;\n            this._complete();\n        }\n    };\n    Subscriber.prototype.unsubscribe = function () {\n        if (this.closed) {\n            return;\n        }\n        this.isStopped = true;\n        _super.prototype.unsubscribe.call(this);\n    };\n    Subscriber.prototype._next = function (value) {\n        this.destination.next(value);\n    };\n    Subscriber.prototype._error = function (err) {\n        this.destination.error(err);\n        this.unsubscribe();\n    };\n    Subscriber.prototype._complete = function () {\n        this.destination.complete();\n        this.unsubscribe();\n    };\n    Subscriber.prototype._unsubscribeAndRecycle = function () {\n        var _parentOrParents = this._parentOrParents;\n        this._parentOrParents = null;\n        this.unsubscribe();\n        this.closed = false;\n        this.isStopped = false;\n        this._parentOrParents = _parentOrParents;\n        return this;\n    };\n    return Subscriber;\n}(Subscription));\nexport { Subscriber };\nvar SafeSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SafeSubscriber, _super);\n    function SafeSubscriber(_parentSubscriber, observerOrNext, error, complete) {\n        var _this = _super.call(this) || this;\n        _this._parentSubscriber = _parentSubscriber;\n        var next;\n        var context = _this;\n        if (isFunction(observerOrNext)) {\n            next = observerOrNext;\n        }\n        else if (observerOrNext) {\n            next = observerOrNext.next;\n            error = observerOrNext.error;\n            complete = observerOrNext.complete;\n            if (observerOrNext !== emptyObserver) {\n                context = Object.create(observerOrNext);\n                if (isFunction(context.unsubscribe)) {\n                    _this.add(context.unsubscribe.bind(context));\n                }\n                context.unsubscribe = _this.unsubscribe.bind(_this);\n            }\n        }\n        _this._context = context;\n        _this._next = next;\n        _this._error = error;\n        _this._complete = complete;\n        return _this;\n    }\n    SafeSubscriber.prototype.next = function (value) {\n        if (!this.isStopped && this._next) {\n            var _parentSubscriber = this._parentSubscriber;\n            if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                this.__tryOrUnsub(this._next, value);\n            }\n            else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.error = function (err) {\n        if (!this.isStopped) {\n            var _parentSubscriber = this._parentSubscriber;\n            var useDeprecatedSynchronousErrorHandling = config.useDeprecatedSynchronousErrorHandling;\n            if (this._error) {\n                if (!useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                    this.__tryOrUnsub(this._error, err);\n                    this.unsubscribe();\n                }\n                else {\n                    this.__tryOrSetError(_parentSubscriber, this._error, err);\n                    this.unsubscribe();\n                }\n            }\n            else if (!_parentSubscriber.syncErrorThrowable) {\n                this.unsubscribe();\n                if (useDeprecatedSynchronousErrorHandling) {\n                    throw err;\n                }\n                hostReportError(err);\n            }\n            else {\n                if (useDeprecatedSynchronousErrorHandling) {\n                    _parentSubscriber.syncErrorValue = err;\n                    _parentSubscriber.syncErrorThrown = true;\n                }\n                else {\n                    hostReportError(err);\n                }\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.complete = function () {\n        var _this = this;\n        if (!this.isStopped) {\n            var _parentSubscriber = this._parentSubscriber;\n            if (this._complete) {\n                var wrappedComplete = function () { return _this._complete.call(_this._context); };\n                if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                    this.__tryOrUnsub(wrappedComplete);\n                    this.unsubscribe();\n                }\n                else {\n                    this.__tryOrSetError(_parentSubscriber, wrappedComplete);\n                    this.unsubscribe();\n                }\n            }\n            else {\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.__tryOrUnsub = function (fn, value) {\n        try {\n            fn.call(this._context, value);\n        }\n        catch (err) {\n            this.unsubscribe();\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                throw err;\n            }\n            else {\n                hostReportError(err);\n            }\n        }\n    };\n    SafeSubscriber.prototype.__tryOrSetError = function (parent, fn, value) {\n        if (!config.useDeprecatedSynchronousErrorHandling) {\n            throw new Error('bad call');\n        }\n        try {\n            fn.call(this._context, value);\n        }\n        catch (err) {\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                parent.syncErrorValue = err;\n                parent.syncErrorThrown = true;\n                return true;\n            }\n            else {\n                hostReportError(err);\n                return true;\n            }\n        }\n        return false;\n    };\n    SafeSubscriber.prototype._unsubscribe = function () {\n        var _parentSubscriber = this._parentSubscriber;\n        this._context = null;\n        this._parentSubscriber = null;\n        _parentSubscriber.unsubscribe();\n    };\n    return SafeSubscriber;\n}(Subscriber));\nexport { SafeSubscriber };\n//# sourceMappingURL=Subscriber.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var observable = /*@__PURE__*/ (function () { return typeof Symbol === 'function' && Symbol.observable || '@@observable'; })();\n//# sourceMappingURL=observable.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function noop() { }\n//# sourceMappingURL=noop.js.map\n","/** PURE_IMPORTS_START _noop PURE_IMPORTS_END */\nimport { noop } from './noop';\nexport function pipe() {\n    var fns = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        fns[_i] = arguments[_i];\n    }\n    return pipeFromArray(fns);\n}\nexport function pipeFromArray(fns) {\n    if (!fns) {\n        return noop;\n    }\n    if (fns.length === 1) {\n        return fns[0];\n    }\n    return function piped(input) {\n        return fns.reduce(function (prev, fn) { return fn(prev); }, input);\n    };\n}\n//# sourceMappingURL=pipe.js.map\n","/** PURE_IMPORTS_START _util_canReportError,_util_toSubscriber,_symbol_observable,_util_pipe,_config PURE_IMPORTS_END */\nimport { canReportError } from './util/canReportError';\nimport { toSubscriber } from './util/toSubscriber';\nimport { observable as Symbol_observable } from './symbol/observable';\nimport { pipeFromArray } from './util/pipe';\nimport { config } from './config';\nvar Observable = /*@__PURE__*/ (function () {\n    function Observable(subscribe) {\n        this._isScalar = false;\n        if (subscribe) {\n            this._subscribe = subscribe;\n        }\n    }\n    Observable.prototype.lift = function (operator) {\n        var observable = new Observable();\n        observable.source = this;\n        observable.operator = operator;\n        return observable;\n    };\n    Observable.prototype.subscribe = function (observerOrNext, error, complete) {\n        var operator = this.operator;\n        var sink = toSubscriber(observerOrNext, error, complete);\n        if (operator) {\n            sink.add(operator.call(sink, this.source));\n        }\n        else {\n            sink.add(this.source || (config.useDeprecatedSynchronousErrorHandling && !sink.syncErrorThrowable) ?\n                this._subscribe(sink) :\n                this._trySubscribe(sink));\n        }\n        if (config.useDeprecatedSynchronousErrorHandling) {\n            if (sink.syncErrorThrowable) {\n                sink.syncErrorThrowable = false;\n                if (sink.syncErrorThrown) {\n                    throw sink.syncErrorValue;\n                }\n            }\n        }\n        return sink;\n    };\n    Observable.prototype._trySubscribe = function (sink) {\n        try {\n            return this._subscribe(sink);\n        }\n        catch (err) {\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                sink.syncErrorThrown = true;\n                sink.syncErrorValue = err;\n            }\n            if (canReportError(sink)) {\n                sink.error(err);\n            }\n            else {\n                console.warn(err);\n            }\n        }\n    };\n    Observable.prototype.forEach = function (next, promiseCtor) {\n        var _this = this;\n        promiseCtor = getPromiseCtor(promiseCtor);\n        return new promiseCtor(function (resolve, reject) {\n            var subscription;\n            subscription = _this.subscribe(function (value) {\n                try {\n                    next(value);\n                }\n                catch (err) {\n                    reject(err);\n                    if (subscription) {\n                        subscription.unsubscribe();\n                    }\n                }\n            }, reject, resolve);\n        });\n    };\n    Observable.prototype._subscribe = function (subscriber) {\n        var source = this.source;\n        return source && source.subscribe(subscriber);\n    };\n    Observable.prototype[Symbol_observable] = function () {\n        return this;\n    };\n    Observable.prototype.pipe = function () {\n        var operations = [];\n        for (var _i = 0; _i < arguments.length; _i++) {\n            operations[_i] = arguments[_i];\n        }\n        if (operations.length === 0) {\n            return this;\n        }\n        return pipeFromArray(operations)(this);\n    };\n    Observable.prototype.toPromise = function (promiseCtor) {\n        var _this = this;\n        promiseCtor = getPromiseCtor(promiseCtor);\n        return new promiseCtor(function (resolve, reject) {\n            var value;\n            _this.subscribe(function (x) { return value = x; }, function (err) { return reject(err); }, function () { return resolve(value); });\n        });\n    };\n    Observable.create = function (subscribe) {\n        return new Observable(subscribe);\n    };\n    return Observable;\n}());\nexport { Observable };\nfunction getPromiseCtor(promiseCtor) {\n    if (!promiseCtor) {\n        promiseCtor = config.Promise || Promise;\n    }\n    if (!promiseCtor) {\n        throw new Error('no Promise impl found');\n    }\n    return promiseCtor;\n}\n//# sourceMappingURL=Observable.js.map\n","/** PURE_IMPORTS_START _Subscriber,_symbol_rxSubscriber,_Observer PURE_IMPORTS_END */\nimport { Subscriber } from '../Subscriber';\nimport { rxSubscriber as rxSubscriberSymbol } from '../symbol/rxSubscriber';\nimport { empty as emptyObserver } from '../Observer';\nexport function toSubscriber(nextOrObserver, error, complete) {\n    if (nextOrObserver) {\n        if (nextOrObserver instanceof Subscriber) {\n            return nextOrObserver;\n        }\n        if (nextOrObserver[rxSubscriberSymbol]) {\n            return nextOrObserver[rxSubscriberSymbol]();\n        }\n    }\n    if (!nextOrObserver && !error && !complete) {\n        return new Subscriber(emptyObserver);\n    }\n    return new Subscriber(nextOrObserver, error, complete);\n}\n//# sourceMappingURL=toSubscriber.js.map\n","/** PURE_IMPORTS_START _Subscriber PURE_IMPORTS_END */\nimport { Subscriber } from '../Subscriber';\nexport function canReportError(observer) {\n    while (observer) {\n        var _a = observer, closed_1 = _a.closed, destination = _a.destination, isStopped = _a.isStopped;\n        if (closed_1 || isStopped) {\n            return false;\n        }\n        else if (destination && destination instanceof Subscriber) {\n            observer = destination;\n        }\n        else {\n            observer = null;\n        }\n    }\n    return true;\n}\n//# sourceMappingURL=canReportError.js.map\n","/** PURE_IMPORTS_START _Observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nexport var EMPTY = /*@__PURE__*/ new Observable(function (subscriber) { return subscriber.complete(); });\nexport function empty(scheduler) {\n    return scheduler ? emptyScheduled(scheduler) : EMPTY;\n}\nfunction emptyScheduled(scheduler) {\n    return new Observable(function (subscriber) { return scheduler.schedule(function () { return subscriber.complete(); }); });\n}\n//# sourceMappingURL=empty.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isScheduler(value) {\n    return value && typeof value.schedule === 'function';\n}\n//# sourceMappingURL=isScheduler.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var subscribeToArray = function (array) {\n    return function (subscriber) {\n        for (var i = 0, len = array.length; i < len && !subscriber.closed; i++) {\n            subscriber.next(array[i]);\n        }\n        subscriber.complete();\n    };\n};\n//# sourceMappingURL=subscribeToArray.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nexport function scheduleArray(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        var i = 0;\n        sub.add(scheduler.schedule(function () {\n            if (i === input.length) {\n                subscriber.complete();\n                return;\n            }\n            subscriber.next(input[i++]);\n            if (!subscriber.closed) {\n                sub.add(this.schedule());\n            }\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleArray.js.map\n","/** PURE_IMPORTS_START _Observable,_util_subscribeToArray,_scheduled_scheduleArray PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { subscribeToArray } from '../util/subscribeToArray';\nimport { scheduleArray } from '../scheduled/scheduleArray';\nexport function fromArray(input, scheduler) {\n    if (!scheduler) {\n        return new Observable(subscribeToArray(input));\n    }\n    else {\n        return scheduleArray(input, scheduler);\n    }\n}\n//# sourceMappingURL=fromArray.js.map\n","/** PURE_IMPORTS_START _util_isScheduler,_fromArray,_scheduled_scheduleArray PURE_IMPORTS_END */\nimport { isScheduler } from '../util/isScheduler';\nimport { fromArray } from './fromArray';\nimport { scheduleArray } from '../scheduled/scheduleArray';\nexport function of() {\n    var args = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        args[_i] = arguments[_i];\n    }\n    var scheduler = args[args.length - 1];\n    if (isScheduler(scheduler)) {\n        args.pop();\n        return scheduleArray(args, scheduler);\n    }\n    else {\n        return fromArray(args);\n    }\n}\n//# sourceMappingURL=of.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from './Subscriber';\nvar InnerSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(InnerSubscriber, _super);\n    function InnerSubscriber(parent, outerValue, outerIndex) {\n        var _this = _super.call(this) || this;\n        _this.parent = parent;\n        _this.outerValue = outerValue;\n        _this.outerIndex = outerIndex;\n        _this.index = 0;\n        return _this;\n    }\n    InnerSubscriber.prototype._next = function (value) {\n        this.parent.notifyNext(this.outerValue, value, this.outerIndex, this.index++, this);\n    };\n    InnerSubscriber.prototype._error = function (error) {\n        this.parent.notifyError(error, this);\n        this.unsubscribe();\n    };\n    InnerSubscriber.prototype._complete = function () {\n        this.parent.notifyComplete(this);\n        this.unsubscribe();\n    };\n    return InnerSubscriber;\n}(Subscriber));\nexport { InnerSubscriber };\n//# sourceMappingURL=InnerSubscriber.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function getSymbolIterator() {\n    if (typeof Symbol !== 'function' || !Symbol.iterator) {\n        return '@@iterator';\n    }\n    return Symbol.iterator;\n}\nexport var iterator = /*@__PURE__*/ getSymbolIterator();\nexport var $$iterator = iterator;\n//# sourceMappingURL=iterator.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var isArrayLike = (function (x) { return x && typeof x.length === 'number' && typeof x !== 'function'; });\n//# sourceMappingURL=isArrayLike.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isPromise(value) {\n    return !!value && typeof value.subscribe !== 'function' && typeof value.then === 'function';\n}\n//# sourceMappingURL=isPromise.js.map\n","/** PURE_IMPORTS_START _subscribeToArray,_subscribeToPromise,_subscribeToIterable,_subscribeToObservable,_isArrayLike,_isPromise,_isObject,_symbol_iterator,_symbol_observable PURE_IMPORTS_END */\nimport { subscribeToArray } from './subscribeToArray';\nimport { subscribeToPromise } from './subscribeToPromise';\nimport { subscribeToIterable } from './subscribeToIterable';\nimport { subscribeToObservable } from './subscribeToObservable';\nimport { isArrayLike } from './isArrayLike';\nimport { isPromise } from './isPromise';\nimport { isObject } from './isObject';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport var subscribeTo = function (result) {\n    if (!!result && typeof result[Symbol_observable] === 'function') {\n        return subscribeToObservable(result);\n    }\n    else if (isArrayLike(result)) {\n        return subscribeToArray(result);\n    }\n    else if (isPromise(result)) {\n        return subscribeToPromise(result);\n    }\n    else if (!!result && typeof result[Symbol_iterator] === 'function') {\n        return subscribeToIterable(result);\n    }\n    else {\n        var value = isObject(result) ? 'an invalid object' : \"'\" + result + \"'\";\n        var msg = \"You provided \" + value + \" where a stream was expected.\"\n            + ' You can provide an Observable, Promise, Array, or Iterable.';\n        throw new TypeError(msg);\n    }\n};\n//# sourceMappingURL=subscribeTo.js.map\n","/** PURE_IMPORTS_START _symbol_observable PURE_IMPORTS_END */\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport var subscribeToObservable = function (obj) {\n    return function (subscriber) {\n        var obs = obj[Symbol_observable]();\n        if (typeof obs.subscribe !== 'function') {\n            throw new TypeError('Provided object does not correctly implement Symbol.observable');\n        }\n        else {\n            return obs.subscribe(subscriber);\n        }\n    };\n};\n//# sourceMappingURL=subscribeToObservable.js.map\n","/** PURE_IMPORTS_START _hostReportError PURE_IMPORTS_END */\nimport { hostReportError } from './hostReportError';\nexport var subscribeToPromise = function (promise) {\n    return function (subscriber) {\n        promise.then(function (value) {\n            if (!subscriber.closed) {\n                subscriber.next(value);\n                subscriber.complete();\n            }\n        }, function (err) { return subscriber.error(err); })\n            .then(null, hostReportError);\n        return subscriber;\n    };\n};\n//# sourceMappingURL=subscribeToPromise.js.map\n","/** PURE_IMPORTS_START _symbol_iterator PURE_IMPORTS_END */\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport var subscribeToIterable = function (iterable) {\n    return function (subscriber) {\n        var iterator = iterable[Symbol_iterator]();\n        do {\n            var item = iterator.next();\n            if (item.done) {\n                subscriber.complete();\n                break;\n            }\n            subscriber.next(item.value);\n            if (subscriber.closed) {\n                break;\n            }\n        } while (true);\n        if (typeof iterator.return === 'function') {\n            subscriber.add(function () {\n                if (iterator.return) {\n                    iterator.return();\n                }\n            });\n        }\n        return subscriber;\n    };\n};\n//# sourceMappingURL=subscribeToIterable.js.map\n","/** PURE_IMPORTS_START _InnerSubscriber,_subscribeTo,_Observable PURE_IMPORTS_END */\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { subscribeTo } from './subscribeTo';\nimport { Observable } from '../Observable';\nexport function subscribeToResult(outerSubscriber, result, outerValue, outerIndex, destination) {\n    if (destination === void 0) {\n        destination = new InnerSubscriber(outerSubscriber, outerValue, outerIndex);\n    }\n    if (destination.closed) {\n        return undefined;\n    }\n    if (result instanceof Observable) {\n        return result.subscribe(destination);\n    }\n    return subscribeTo(result)(destination);\n}\n//# sourceMappingURL=subscribeToResult.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from './Subscriber';\nvar OuterSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(OuterSubscriber, _super);\n    function OuterSubscriber() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    OuterSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    OuterSubscriber.prototype.notifyError = function (error, innerSub) {\n        this.destination.error(error);\n    };\n    OuterSubscriber.prototype.notifyComplete = function (innerSub) {\n        this.destination.complete();\n    };\n    return OuterSubscriber;\n}(Subscriber));\nexport { OuterSubscriber };\n//# sourceMappingURL=OuterSubscriber.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function map(project, thisArg) {\n    return function mapOperation(source) {\n        if (typeof project !== 'function') {\n            throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');\n        }\n        return source.lift(new MapOperator(project, thisArg));\n    };\n}\nvar MapOperator = /*@__PURE__*/ (function () {\n    function MapOperator(project, thisArg) {\n        this.project = project;\n        this.thisArg = thisArg;\n    }\n    MapOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));\n    };\n    return MapOperator;\n}());\nexport { MapOperator };\nvar MapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MapSubscriber, _super);\n    function MapSubscriber(destination, project, thisArg) {\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.count = 0;\n        _this.thisArg = thisArg || _this;\n        return _this;\n    }\n    MapSubscriber.prototype._next = function (value) {\n        var result;\n        try {\n            result = this.project.call(this.thisArg, value, this.count++);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return MapSubscriber;\n}(Subscriber));\n//# sourceMappingURL=map.js.map\n","/** PURE_IMPORTS_START _scheduleObservable,_schedulePromise,_scheduleArray,_scheduleIterable,_util_isInteropObservable,_util_isPromise,_util_isArrayLike,_util_isIterable PURE_IMPORTS_END */\nimport { scheduleObservable } from './scheduleObservable';\nimport { schedulePromise } from './schedulePromise';\nimport { scheduleArray } from './scheduleArray';\nimport { scheduleIterable } from './scheduleIterable';\nimport { isInteropObservable } from '../util/isInteropObservable';\nimport { isPromise } from '../util/isPromise';\nimport { isArrayLike } from '../util/isArrayLike';\nimport { isIterable } from '../util/isIterable';\nexport function scheduled(input, scheduler) {\n    if (input != null) {\n        if (isInteropObservable(input)) {\n            return scheduleObservable(input, scheduler);\n        }\n        else if (isPromise(input)) {\n            return schedulePromise(input, scheduler);\n        }\n        else if (isArrayLike(input)) {\n            return scheduleArray(input, scheduler);\n        }\n        else if (isIterable(input) || typeof input === 'string') {\n            return scheduleIterable(input, scheduler);\n        }\n    }\n    throw new TypeError((input !== null && typeof input || input) + ' is not observable');\n}\n//# sourceMappingURL=scheduled.js.map\n","/** PURE_IMPORTS_START _symbol_observable PURE_IMPORTS_END */\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport function isInteropObservable(input) {\n    return input && typeof input[Symbol_observable] === 'function';\n}\n//# sourceMappingURL=isInteropObservable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription,_symbol_observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport function scheduleObservable(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        sub.add(scheduler.schedule(function () {\n            var observable = input[Symbol_observable]();\n            sub.add(observable.subscribe({\n                next: function (value) { sub.add(scheduler.schedule(function () { return subscriber.next(value); })); },\n                error: function (err) { sub.add(scheduler.schedule(function () { return subscriber.error(err); })); },\n                complete: function () { sub.add(scheduler.schedule(function () { return subscriber.complete(); })); },\n            }));\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleObservable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nexport function schedulePromise(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        sub.add(scheduler.schedule(function () {\n            return input.then(function (value) {\n                sub.add(scheduler.schedule(function () {\n                    subscriber.next(value);\n                    sub.add(scheduler.schedule(function () { return subscriber.complete(); }));\n                }));\n            }, function (err) {\n                sub.add(scheduler.schedule(function () { return subscriber.error(err); }));\n            });\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=schedulePromise.js.map\n","/** PURE_IMPORTS_START _symbol_iterator PURE_IMPORTS_END */\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport function isIterable(input) {\n    return input && typeof input[Symbol_iterator] === 'function';\n}\n//# sourceMappingURL=isIterable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription,_symbol_iterator PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport function scheduleIterable(input, scheduler) {\n    if (!input) {\n        throw new Error('Iterable cannot be null');\n    }\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        var iterator;\n        sub.add(function () {\n            if (iterator && typeof iterator.return === 'function') {\n                iterator.return();\n            }\n        });\n        sub.add(scheduler.schedule(function () {\n            iterator = input[Symbol_iterator]();\n            sub.add(scheduler.schedule(function () {\n                if (subscriber.closed) {\n                    return;\n                }\n                var value;\n                var done;\n                try {\n                    var result = iterator.next();\n                    value = result.value;\n                    done = result.done;\n                }\n                catch (err) {\n                    subscriber.error(err);\n                    return;\n                }\n                if (done) {\n                    subscriber.complete();\n                }\n                else {\n                    subscriber.next(value);\n                    this.schedule();\n                }\n            }));\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleIterable.js.map\n","/** PURE_IMPORTS_START _Observable,_util_subscribeTo,_scheduled_scheduled PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { subscribeTo } from '../util/subscribeTo';\nimport { scheduled } from '../scheduled/scheduled';\nexport function from(input, scheduler) {\n    if (!scheduler) {\n        if (input instanceof Observable) {\n            return input;\n        }\n        return new Observable(subscribeTo(input));\n    }\n    else {\n        return scheduled(input, scheduler);\n    }\n}\n//# sourceMappingURL=from.js.map\n","/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber,_map,_observable_from PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { map } from './map';\nimport { from } from '../observable/from';\nexport function mergeMap(project, resultSelector, concurrent) {\n    if (concurrent === void 0) {\n        concurrent = Number.POSITIVE_INFINITY;\n    }\n    if (typeof resultSelector === 'function') {\n        return function (source) { return source.pipe(mergeMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); }, concurrent)); };\n    }\n    else if (typeof resultSelector === 'number') {\n        concurrent = resultSelector;\n    }\n    return function (source) { return source.lift(new MergeMapOperator(project, concurrent)); };\n}\nvar MergeMapOperator = /*@__PURE__*/ (function () {\n    function MergeMapOperator(project, concurrent) {\n        if (concurrent === void 0) {\n            concurrent = Number.POSITIVE_INFINITY;\n        }\n        this.project = project;\n        this.concurrent = concurrent;\n    }\n    MergeMapOperator.prototype.call = function (observer, source) {\n        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));\n    };\n    return MergeMapOperator;\n}());\nexport { MergeMapOperator };\nvar MergeMapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MergeMapSubscriber, _super);\n    function MergeMapSubscriber(destination, project, concurrent) {\n        if (concurrent === void 0) {\n            concurrent = Number.POSITIVE_INFINITY;\n        }\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.concurrent = concurrent;\n        _this.hasCompleted = false;\n        _this.buffer = [];\n        _this.active = 0;\n        _this.index = 0;\n        return _this;\n    }\n    MergeMapSubscriber.prototype._next = function (value) {\n        if (this.active < this.concurrent) {\n            this._tryNext(value);\n        }\n        else {\n            this.buffer.push(value);\n        }\n    };\n    MergeMapSubscriber.prototype._tryNext = function (value) {\n        var result;\n        var index = this.index++;\n        try {\n            result = this.project(value, index);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.active++;\n        this._innerSub(result, value, index);\n    };\n    MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {\n        var innerSubscriber = new InnerSubscriber(this, undefined, undefined);\n        var destination = this.destination;\n        destination.add(innerSubscriber);\n        subscribeToResult(this, ish, value, index, innerSubscriber);\n    };\n    MergeMapSubscriber.prototype._complete = function () {\n        this.hasCompleted = true;\n        if (this.active === 0 && this.buffer.length === 0) {\n            this.destination.complete();\n        }\n        this.unsubscribe();\n    };\n    MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {\n        var buffer = this.buffer;\n        this.remove(innerSub);\n        this.active--;\n        if (buffer.length > 0) {\n            this._next(buffer.shift());\n        }\n        else if (this.active === 0 && this.hasCompleted) {\n            this.destination.complete();\n        }\n    };\n    return MergeMapSubscriber;\n}(OuterSubscriber));\nexport { MergeMapSubscriber };\n//# sourceMappingURL=mergeMap.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function identity(x) {\n    return x;\n}\n//# sourceMappingURL=identity.js.map\n","/** PURE_IMPORTS_START _mergeMap,_util_identity PURE_IMPORTS_END */\nimport { mergeMap } from './mergeMap';\nimport { identity } from '../util/identity';\nexport function mergeAll(concurrent) {\n    if (concurrent === void 0) {\n        concurrent = Number.POSITIVE_INFINITY;\n    }\n    return mergeMap(identity, concurrent);\n}\n//# sourceMappingURL=mergeAll.js.map\n","/** PURE_IMPORTS_START _Observable,_util_isScheduler,_operators_mergeAll,_fromArray PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isScheduler } from '../util/isScheduler';\nimport { mergeAll } from '../operators/mergeAll';\nimport { fromArray } from './fromArray';\nexport function merge() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    var concurrent = Number.POSITIVE_INFINITY;\n    var scheduler = null;\n    var last = observables[observables.length - 1];\n    if (isScheduler(last)) {\n        scheduler = observables.pop();\n        if (observables.length > 1 && typeof observables[observables.length - 1] === 'number') {\n            concurrent = observables.pop();\n        }\n    }\n    else if (typeof last === 'number') {\n        concurrent = observables.pop();\n    }\n    if (scheduler === null && observables.length === 1 && observables[0] instanceof Observable) {\n        return observables[0];\n    }\n    return mergeAll(concurrent)(fromArray(observables, scheduler));\n}\n//# sourceMappingURL=merge.js.map\n","/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isArray } from '../util/isArray';\nimport { isFunction } from '../util/isFunction';\nimport { map } from '../operators/map';\nvar toString = /*@__PURE__*/ (function () { return Object.prototype.toString; })();\nexport function fromEvent(target, eventName, options, resultSelector) {\n    if (isFunction(options)) {\n        resultSelector = options;\n        options = undefined;\n    }\n    if (resultSelector) {\n        return fromEvent(target, eventName, options).pipe(map(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));\n    }\n    return new Observable(function (subscriber) {\n        function handler(e) {\n            if (arguments.length > 1) {\n                subscriber.next(Array.prototype.slice.call(arguments));\n            }\n            else {\n                subscriber.next(e);\n            }\n        }\n        setupSubscription(target, eventName, handler, subscriber, options);\n    });\n}\nfunction setupSubscription(sourceObj, eventName, handler, subscriber, options) {\n    var unsubscribe;\n    if (isEventTarget(sourceObj)) {\n        var source_1 = sourceObj;\n        sourceObj.addEventListener(eventName, handler, options);\n        unsubscribe = function () { return source_1.removeEventListener(eventName, handler, options); };\n    }\n    else if (isJQueryStyleEventEmitter(sourceObj)) {\n        var source_2 = sourceObj;\n        sourceObj.on(eventName, handler);\n        unsubscribe = function () { return source_2.off(eventName, handler); };\n    }\n    else if (isNodeStyleEventEmitter(sourceObj)) {\n        var source_3 = sourceObj;\n        sourceObj.addListener(eventName, handler);\n        unsubscribe = function () { return source_3.removeListener(eventName, handler); };\n    }\n    else if (sourceObj && sourceObj.length) {\n        for (var i = 0, len = sourceObj.length; i < len; i++) {\n            setupSubscription(sourceObj[i], eventName, handler, subscriber, options);\n        }\n    }\n    else {\n        throw new TypeError('Invalid event target');\n    }\n    subscriber.add(unsubscribe);\n}\nfunction isNodeStyleEventEmitter(sourceObj) {\n    return sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function';\n}\nfunction isJQueryStyleEventEmitter(sourceObj) {\n    return sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function';\n}\nfunction isEventTarget(sourceObj) {\n    return sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function';\n}\n//# sourceMappingURL=fromEvent.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_util_noop,_util_isFunction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { noop } from '../util/noop';\nimport { isFunction } from '../util/isFunction';\nexport function tap(nextOrObserver, error, complete) {\n    return function tapOperatorFunction(source) {\n        return source.lift(new DoOperator(nextOrObserver, error, complete));\n    };\n}\nvar DoOperator = /*@__PURE__*/ (function () {\n    function DoOperator(nextOrObserver, error, complete) {\n        this.nextOrObserver = nextOrObserver;\n        this.error = error;\n        this.complete = complete;\n    }\n    DoOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new TapSubscriber(subscriber, this.nextOrObserver, this.error, this.complete));\n    };\n    return DoOperator;\n}());\nvar TapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(TapSubscriber, _super);\n    function TapSubscriber(destination, observerOrNext, error, complete) {\n        var _this = _super.call(this, destination) || this;\n        _this._tapNext = noop;\n        _this._tapError = noop;\n        _this._tapComplete = noop;\n        _this._tapError = error || noop;\n        _this._tapComplete = complete || noop;\n        if (isFunction(observerOrNext)) {\n            _this._context = _this;\n            _this._tapNext = observerOrNext;\n        }\n        else if (observerOrNext) {\n            _this._context = observerOrNext;\n            _this._tapNext = observerOrNext.next || noop;\n            _this._tapError = observerOrNext.error || noop;\n            _this._tapComplete = observerOrNext.complete || noop;\n        }\n        return _this;\n    }\n    TapSubscriber.prototype._next = function (value) {\n        try {\n            this._tapNext.call(this._context, value);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(value);\n    };\n    TapSubscriber.prototype._error = function (err) {\n        try {\n            this._tapError.call(this._context, err);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.error(err);\n    };\n    TapSubscriber.prototype._complete = function () {\n        try {\n            this._tapComplete.call(this._context);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        return this.destination.complete();\n    };\n    return TapSubscriber;\n}(Subscriber));\n//# sourceMappingURL=tap.js.map\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_InnerSubscriber,_util_subscribeToResult,_map,_observable_from PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { map } from './map';\nimport { from } from '../observable/from';\nexport function switchMap(project, resultSelector) {\n    if (typeof resultSelector === 'function') {\n        return function (source) { return source.pipe(switchMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); })); };\n    }\n    return function (source) { return source.lift(new SwitchMapOperator(project)); };\n}\nvar SwitchMapOperator = /*@__PURE__*/ (function () {\n    function SwitchMapOperator(project) {\n        this.project = project;\n    }\n    SwitchMapOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new SwitchMapSubscriber(subscriber, this.project));\n    };\n    return SwitchMapOperator;\n}());\nvar SwitchMapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SwitchMapSubscriber, _super);\n    function SwitchMapSubscriber(destination, project) {\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.index = 0;\n        return _this;\n    }\n    SwitchMapSubscriber.prototype._next = function (value) {\n        var result;\n        var index = this.index++;\n        try {\n            result = this.project(value, index);\n        }\n        catch (error) {\n            this.destination.error(error);\n            return;\n        }\n        this._innerSub(result, value, index);\n    };\n    SwitchMapSubscriber.prototype._innerSub = function (result, value, index) {\n        var innerSubscription = this.innerSubscription;\n        if (innerSubscription) {\n            innerSubscription.unsubscribe();\n        }\n        var innerSubscriber = new InnerSubscriber(this, undefined, undefined);\n        var destination = this.destination;\n        destination.add(innerSubscriber);\n        this.innerSubscription = subscribeToResult(this, result, value, index, innerSubscriber);\n    };\n    SwitchMapSubscriber.prototype._complete = function () {\n        var innerSubscription = this.innerSubscription;\n        if (!innerSubscription || innerSubscription.closed) {\n            _super.prototype._complete.call(this);\n        }\n        this.unsubscribe();\n    };\n    SwitchMapSubscriber.prototype._unsubscribe = function () {\n        this.innerSubscription = null;\n    };\n    SwitchMapSubscriber.prototype.notifyComplete = function (innerSub) {\n        var destination = this.destination;\n        destination.remove(innerSub);\n        this.innerSubscription = null;\n        if (this.isStopped) {\n            _super.prototype._complete.call(this);\n        }\n    };\n    SwitchMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    return SwitchMapSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=switchMap.js.map\n","/** PURE_IMPORTS_START _observable_empty,_observable_of,_observable_throwError PURE_IMPORTS_END */\nimport { empty } from './observable/empty';\nimport { of } from './observable/of';\nimport { throwError } from './observable/throwError';\nexport var NotificationKind;\n/*@__PURE__*/ (function (NotificationKind) {\n    NotificationKind[\"NEXT\"] = \"N\";\n    NotificationKind[\"ERROR\"] = \"E\";\n    NotificationKind[\"COMPLETE\"] = \"C\";\n})(NotificationKind || (NotificationKind = {}));\nvar Notification = /*@__PURE__*/ (function () {\n    function Notification(kind, value, error) {\n        this.kind = kind;\n        this.value = value;\n        this.error = error;\n        this.hasValue = kind === 'N';\n    }\n    Notification.prototype.observe = function (observer) {\n        switch (this.kind) {\n            case 'N':\n                return observer.next && observer.next(this.value);\n            case 'E':\n                return observer.error && observer.error(this.error);\n            case 'C':\n                return observer.complete && observer.complete();\n        }\n    };\n    Notification.prototype.do = function (next, error, complete) {\n        var kind = this.kind;\n        switch (kind) {\n            case 'N':\n                return next && next(this.value);\n            case 'E':\n                return error && error(this.error);\n            case 'C':\n                return complete && complete();\n        }\n    };\n    Notification.prototype.accept = function (nextOrObserver, error, complete) {\n        if (nextOrObserver && typeof nextOrObserver.next === 'function') {\n            return this.observe(nextOrObserver);\n        }\n        else {\n            return this.do(nextOrObserver, error, complete);\n        }\n    };\n    Notification.prototype.toObservable = function () {\n        var kind = this.kind;\n        switch (kind) {\n            case 'N':\n                return of(this.value);\n            case 'E':\n                return throwError(this.error);\n            case 'C':\n                return empty();\n        }\n        throw new Error('unexpected notification kind value');\n    };\n    Notification.createNext = function (value) {\n        if (typeof value !== 'undefined') {\n            return new Notification('N', value);\n        }\n        return Notification.undefinedValueNotification;\n    };\n    Notification.createError = function (err) {\n        return new Notification('E', undefined, err);\n    };\n    Notification.createComplete = function () {\n        return Notification.completeNotification;\n    };\n    Notification.completeNotification = new Notification('C');\n    Notification.undefinedValueNotification = new Notification('N', undefined);\n    return Notification;\n}());\nexport { Notification };\n//# sourceMappingURL=Notification.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar ObjectUnsubscribedErrorImpl = /*@__PURE__*/ (function () {\n    function ObjectUnsubscribedErrorImpl() {\n        Error.call(this);\n        this.message = 'object unsubscribed';\n        this.name = 'ObjectUnsubscribedError';\n        return this;\n    }\n    ObjectUnsubscribedErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return ObjectUnsubscribedErrorImpl;\n})();\nexport var ObjectUnsubscribedError = ObjectUnsubscribedErrorImpl;\n//# sourceMappingURL=ObjectUnsubscribedError.js.map\n","/** PURE_IMPORTS_START tslib,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscription } from './Subscription';\nvar SubjectSubscription = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SubjectSubscription, _super);\n    function SubjectSubscription(subject, subscriber) {\n        var _this = _super.call(this) || this;\n        _this.subject = subject;\n        _this.subscriber = subscriber;\n        _this.closed = false;\n        return _this;\n    }\n    SubjectSubscription.prototype.unsubscribe = function () {\n        if (this.closed) {\n            return;\n        }\n        this.closed = true;\n        var subject = this.subject;\n        var observers = subject.observers;\n        this.subject = null;\n        if (!observers || observers.length === 0 || subject.isStopped || subject.closed) {\n            return;\n        }\n        var subscriberIndex = observers.indexOf(this.subscriber);\n        if (subscriberIndex !== -1) {\n            observers.splice(subscriberIndex, 1);\n        }\n    };\n    return SubjectSubscription;\n}(Subscription));\nexport { SubjectSubscription };\n//# sourceMappingURL=SubjectSubscription.js.map\n","/** PURE_IMPORTS_START tslib,_Observable,_Subscriber,_Subscription,_util_ObjectUnsubscribedError,_SubjectSubscription,_internal_symbol_rxSubscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Observable } from './Observable';\nimport { Subscriber } from './Subscriber';\nimport { Subscription } from './Subscription';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\nvar SubjectSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SubjectSubscriber, _super);\n    function SubjectSubscriber(destination) {\n        var _this = _super.call(this, destination) || this;\n        _this.destination = destination;\n        return _this;\n    }\n    return SubjectSubscriber;\n}(Subscriber));\nexport { SubjectSubscriber };\nvar Subject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Subject, _super);\n    function Subject() {\n        var _this = _super.call(this) || this;\n        _this.observers = [];\n        _this.closed = false;\n        _this.isStopped = false;\n        _this.hasError = false;\n        _this.thrownError = null;\n        return _this;\n    }\n    Subject.prototype[rxSubscriberSymbol] = function () {\n        return new SubjectSubscriber(this);\n    };\n    Subject.prototype.lift = function (operator) {\n        var subject = new AnonymousSubject(this, this);\n        subject.operator = operator;\n        return subject;\n    };\n    Subject.prototype.next = function (value) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        if (!this.isStopped) {\n            var observers = this.observers;\n            var len = observers.length;\n            var copy = observers.slice();\n            for (var i = 0; i < len; i++) {\n                copy[i].next(value);\n            }\n        }\n    };\n    Subject.prototype.error = function (err) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        this.hasError = true;\n        this.thrownError = err;\n        this.isStopped = true;\n        var observers = this.observers;\n        var len = observers.length;\n        var copy = observers.slice();\n        for (var i = 0; i < len; i++) {\n            copy[i].error(err);\n        }\n        this.observers.length = 0;\n    };\n    Subject.prototype.complete = function () {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        this.isStopped = true;\n        var observers = this.observers;\n        var len = observers.length;\n        var copy = observers.slice();\n        for (var i = 0; i < len; i++) {\n            copy[i].complete();\n        }\n        this.observers.length = 0;\n    };\n    Subject.prototype.unsubscribe = function () {\n        this.isStopped = true;\n        this.closed = true;\n        this.observers = null;\n    };\n    Subject.prototype._trySubscribe = function (subscriber) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else {\n            return _super.prototype._trySubscribe.call(this, subscriber);\n        }\n    };\n    Subject.prototype._subscribe = function (subscriber) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else if (this.hasError) {\n            subscriber.error(this.thrownError);\n            return Subscription.EMPTY;\n        }\n        else if (this.isStopped) {\n            subscriber.complete();\n            return Subscription.EMPTY;\n        }\n        else {\n            this.observers.push(subscriber);\n            return new SubjectSubscription(this, subscriber);\n        }\n    };\n    Subject.prototype.asObservable = function () {\n        var observable = new Observable();\n        observable.source = this;\n        return observable;\n    };\n    Subject.create = function (destination, source) {\n        return new AnonymousSubject(destination, source);\n    };\n    return Subject;\n}(Observable));\nexport { Subject };\nvar AnonymousSubject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnonymousSubject, _super);\n    function AnonymousSubject(destination, source) {\n        var _this = _super.call(this) || this;\n        _this.destination = destination;\n        _this.source = source;\n        return _this;\n    }\n    AnonymousSubject.prototype.next = function (value) {\n        var destination = this.destination;\n        if (destination && destination.next) {\n            destination.next(value);\n        }\n    };\n    AnonymousSubject.prototype.error = function (err) {\n        var destination = this.destination;\n        if (destination && destination.error) {\n            this.destination.error(err);\n        }\n    };\n    AnonymousSubject.prototype.complete = function () {\n        var destination = this.destination;\n        if (destination && destination.complete) {\n            this.destination.complete();\n        }\n    };\n    AnonymousSubject.prototype._subscribe = function (subscriber) {\n        var source = this.source;\n        if (source) {\n            return this.source.subscribe(subscriber);\n        }\n        else {\n            return Subscription.EMPTY;\n        }\n    };\n    return AnonymousSubject;\n}(Subject));\nexport { AnonymousSubject };\n//# sourceMappingURL=Subject.js.map\n","/** PURE_IMPORTS_START tslib,_Action PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Action } from './Action';\nvar AsyncAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AsyncAction, _super);\n    function AsyncAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        _this.pending = false;\n        return _this;\n    }\n    AsyncAction.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (this.closed) {\n            return this;\n        }\n        this.state = state;\n        var id = this.id;\n        var scheduler = this.scheduler;\n        if (id != null) {\n            this.id = this.recycleAsyncId(scheduler, id, delay);\n        }\n        this.pending = true;\n        this.delay = delay;\n        this.id = this.id || this.requestAsyncId(scheduler, this.id, delay);\n        return this;\n    };\n    AsyncAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return setInterval(scheduler.flush.bind(scheduler, this), delay);\n    };\n    AsyncAction.prototype.recycleAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay !== null && this.delay === delay && this.pending === false) {\n            return id;\n        }\n        clearInterval(id);\n        return undefined;\n    };\n    AsyncAction.prototype.execute = function (state, delay) {\n        if (this.closed) {\n            return new Error('executing a cancelled action');\n        }\n        this.pending = false;\n        var error = this._execute(state, delay);\n        if (error) {\n            return error;\n        }\n        else if (this.pending === false && this.id != null) {\n            this.id = this.recycleAsyncId(this.scheduler, this.id, null);\n        }\n    };\n    AsyncAction.prototype._execute = function (state, delay) {\n        var errored = false;\n        var errorValue = undefined;\n        try {\n            this.work(state);\n        }\n        catch (e) {\n            errored = true;\n            errorValue = !!e && e || new Error(e);\n        }\n        if (errored) {\n            this.unsubscribe();\n            return errorValue;\n        }\n    };\n    AsyncAction.prototype._unsubscribe = function () {\n        var id = this.id;\n        var scheduler = this.scheduler;\n        var actions = scheduler.actions;\n        var index = actions.indexOf(this);\n        this.work = null;\n        this.state = null;\n        this.pending = false;\n        this.scheduler = null;\n        if (index !== -1) {\n            actions.splice(index, 1);\n        }\n        if (id != null) {\n            this.id = this.recycleAsyncId(scheduler, id, null);\n        }\n        this.delay = null;\n    };\n    return AsyncAction;\n}(Action));\nexport { AsyncAction };\n//# sourceMappingURL=AsyncAction.js.map\n","/** PURE_IMPORTS_START tslib,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscription } from '../Subscription';\nvar Action = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Action, _super);\n    function Action(scheduler, work) {\n        return _super.call(this) || this;\n    }\n    Action.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return this;\n    };\n    return Action;\n}(Subscription));\nexport { Action };\n//# sourceMappingURL=Action.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncAction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncAction } from './AsyncAction';\nvar QueueAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(QueueAction, _super);\n    function QueueAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        return _this;\n    }\n    QueueAction.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay > 0) {\n            return _super.prototype.schedule.call(this, state, delay);\n        }\n        this.delay = delay;\n        this.state = state;\n        this.scheduler.flush(this);\n        return this;\n    };\n    QueueAction.prototype.execute = function (state, delay) {\n        return (delay > 0 || this.closed) ?\n            _super.prototype.execute.call(this, state, delay) :\n            this._execute(state, delay);\n    };\n    QueueAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);\n        }\n        return scheduler.flush(this);\n    };\n    return QueueAction;\n}(AsyncAction));\nexport { QueueAction };\n//# sourceMappingURL=QueueAction.js.map\n","var Scheduler = /*@__PURE__*/ (function () {\n    function Scheduler(SchedulerAction, now) {\n        if (now === void 0) {\n            now = Scheduler.now;\n        }\n        this.SchedulerAction = SchedulerAction;\n        this.now = now;\n    }\n    Scheduler.prototype.schedule = function (work, delay, state) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return new this.SchedulerAction(this, work).schedule(state, delay);\n    };\n    Scheduler.now = function () { return Date.now(); };\n    return Scheduler;\n}());\nexport { Scheduler };\n//# sourceMappingURL=Scheduler.js.map\n","/** PURE_IMPORTS_START tslib,_Scheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Scheduler } from '../Scheduler';\nvar AsyncScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AsyncScheduler, _super);\n    function AsyncScheduler(SchedulerAction, now) {\n        if (now === void 0) {\n            now = Scheduler.now;\n        }\n        var _this = _super.call(this, SchedulerAction, function () {\n            if (AsyncScheduler.delegate && AsyncScheduler.delegate !== _this) {\n                return AsyncScheduler.delegate.now();\n            }\n            else {\n                return now();\n            }\n        }) || this;\n        _this.actions = [];\n        _this.active = false;\n        _this.scheduled = undefined;\n        return _this;\n    }\n    AsyncScheduler.prototype.schedule = function (work, delay, state) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (AsyncScheduler.delegate && AsyncScheduler.delegate !== this) {\n            return AsyncScheduler.delegate.schedule(work, delay, state);\n        }\n        else {\n            return _super.prototype.schedule.call(this, work, delay, state);\n        }\n    };\n    AsyncScheduler.prototype.flush = function (action) {\n        var actions = this.actions;\n        if (this.active) {\n            actions.push(action);\n            return;\n        }\n        var error;\n        this.active = true;\n        do {\n            if (error = action.execute(action.state, action.delay)) {\n                break;\n            }\n        } while (action = actions.shift());\n        this.active = false;\n        if (error) {\n            while (action = actions.shift()) {\n                action.unsubscribe();\n            }\n            throw error;\n        }\n    };\n    return AsyncScheduler;\n}(Scheduler));\nexport { AsyncScheduler };\n//# sourceMappingURL=AsyncScheduler.js.map\n","/** PURE_IMPORTS_START _QueueAction,_QueueScheduler PURE_IMPORTS_END */\nimport { QueueAction } from './QueueAction';\nimport { QueueScheduler } from './QueueScheduler';\nexport var queue = /*@__PURE__*/ new QueueScheduler(QueueAction);\n//# sourceMappingURL=queue.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncScheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncScheduler } from './AsyncScheduler';\nvar QueueScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(QueueScheduler, _super);\n    function QueueScheduler() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    return QueueScheduler;\n}(AsyncScheduler));\nexport { QueueScheduler };\n//# sourceMappingURL=QueueScheduler.js.map\n","/** PURE_IMPORTS_START _Observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nexport function throwError(error, scheduler) {\n    if (!scheduler) {\n        return new Observable(function (subscriber) { return subscriber.error(error); });\n    }\n    else {\n        return new Observable(function (subscriber) { return scheduler.schedule(dispatch, 0, { error: error, subscriber: subscriber }); });\n    }\n}\nfunction dispatch(_a) {\n    var error = _a.error, subscriber = _a.subscriber;\n    subscriber.error(error);\n}\n//# sourceMappingURL=throwError.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_Notification PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { Notification } from '../Notification';\nexport function observeOn(scheduler, delay) {\n    if (delay === void 0) {\n        delay = 0;\n    }\n    return function observeOnOperatorFunction(source) {\n        return source.lift(new ObserveOnOperator(scheduler, delay));\n    };\n}\nvar ObserveOnOperator = /*@__PURE__*/ (function () {\n    function ObserveOnOperator(scheduler, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        this.scheduler = scheduler;\n        this.delay = delay;\n    }\n    ObserveOnOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));\n    };\n    return ObserveOnOperator;\n}());\nexport { ObserveOnOperator };\nvar ObserveOnSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ObserveOnSubscriber, _super);\n    function ObserveOnSubscriber(destination, scheduler, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        var _this = _super.call(this, destination) || this;\n        _this.scheduler = scheduler;\n        _this.delay = delay;\n        return _this;\n    }\n    ObserveOnSubscriber.dispatch = function (arg) {\n        var notification = arg.notification, destination = arg.destination;\n        notification.observe(destination);\n        this.unsubscribe();\n    };\n    ObserveOnSubscriber.prototype.scheduleMessage = function (notification) {\n        var destination = this.destination;\n        destination.add(this.scheduler.schedule(ObserveOnSubscriber.dispatch, this.delay, new ObserveOnMessage(notification, this.destination)));\n    };\n    ObserveOnSubscriber.prototype._next = function (value) {\n        this.scheduleMessage(Notification.createNext(value));\n    };\n    ObserveOnSubscriber.prototype._error = function (err) {\n        this.scheduleMessage(Notification.createError(err));\n        this.unsubscribe();\n    };\n    ObserveOnSubscriber.prototype._complete = function () {\n        this.scheduleMessage(Notification.createComplete());\n        this.unsubscribe();\n    };\n    return ObserveOnSubscriber;\n}(Subscriber));\nexport { ObserveOnSubscriber };\nvar ObserveOnMessage = /*@__PURE__*/ (function () {\n    function ObserveOnMessage(notification, destination) {\n        this.notification = notification;\n        this.destination = destination;\n    }\n    return ObserveOnMessage;\n}());\nexport { ObserveOnMessage };\n//# sourceMappingURL=observeOn.js.map\n","/** PURE_IMPORTS_START tslib,_Subject,_scheduler_queue,_Subscription,_operators_observeOn,_util_ObjectUnsubscribedError,_SubjectSubscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subject } from './Subject';\nimport { queue } from './scheduler/queue';\nimport { Subscription } from './Subscription';\nimport { ObserveOnSubscriber } from './operators/observeOn';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nvar ReplaySubject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ReplaySubject, _super);\n    function ReplaySubject(bufferSize, windowTime, scheduler) {\n        if (bufferSize === void 0) {\n            bufferSize = Number.POSITIVE_INFINITY;\n        }\n        if (windowTime === void 0) {\n            windowTime = Number.POSITIVE_INFINITY;\n        }\n        var _this = _super.call(this) || this;\n        _this.scheduler = scheduler;\n        _this._events = [];\n        _this._infiniteTimeWindow = false;\n        _this._bufferSize = bufferSize < 1 ? 1 : bufferSize;\n        _this._windowTime = windowTime < 1 ? 1 : windowTime;\n        if (windowTime === Number.POSITIVE_INFINITY) {\n            _this._infiniteTimeWindow = true;\n            _this.next = _this.nextInfiniteTimeWindow;\n        }\n        else {\n            _this.next = _this.nextTimeWindow;\n        }\n        return _this;\n    }\n    ReplaySubject.prototype.nextInfiniteTimeWindow = function (value) {\n        var _events = this._events;\n        _events.push(value);\n        if (_events.length > this._bufferSize) {\n            _events.shift();\n        }\n        _super.prototype.next.call(this, value);\n    };\n    ReplaySubject.prototype.nextTimeWindow = function (value) {\n        this._events.push(new ReplayEvent(this._getNow(), value));\n        this._trimBufferThenGetEvents();\n        _super.prototype.next.call(this, value);\n    };\n    ReplaySubject.prototype._subscribe = function (subscriber) {\n        var _infiniteTimeWindow = this._infiniteTimeWindow;\n        var _events = _infiniteTimeWindow ? this._events : this._trimBufferThenGetEvents();\n        var scheduler = this.scheduler;\n        var len = _events.length;\n        var subscription;\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else if (this.isStopped || this.hasError) {\n            subscription = Subscription.EMPTY;\n        }\n        else {\n            this.observers.push(subscriber);\n            subscription = new SubjectSubscription(this, subscriber);\n        }\n        if (scheduler) {\n            subscriber.add(subscriber = new ObserveOnSubscriber(subscriber, scheduler));\n        }\n        if (_infiniteTimeWindow) {\n            for (var i = 0; i < len && !subscriber.closed; i++) {\n                subscriber.next(_events[i]);\n            }\n        }\n        else {\n            for (var i = 0; i < len && !subscriber.closed; i++) {\n                subscriber.next(_events[i].value);\n            }\n        }\n        if (this.hasError) {\n            subscriber.error(this.thrownError);\n        }\n        else if (this.isStopped) {\n            subscriber.complete();\n        }\n        return subscription;\n    };\n    ReplaySubject.prototype._getNow = function () {\n        return (this.scheduler || queue).now();\n    };\n    ReplaySubject.prototype._trimBufferThenGetEvents = function () {\n        var now = this._getNow();\n        var _bufferSize = this._bufferSize;\n        var _windowTime = this._windowTime;\n        var _events = this._events;\n        var eventsCount = _events.length;\n        var spliceCount = 0;\n        while (spliceCount < eventsCount) {\n            if ((now - _events[spliceCount].time) < _windowTime) {\n                break;\n            }\n            spliceCount++;\n        }\n        if (eventsCount > _bufferSize) {\n            spliceCount = Math.max(spliceCount, eventsCount - _bufferSize);\n        }\n        if (spliceCount > 0) {\n            _events.splice(0, spliceCount);\n        }\n        return _events;\n    };\n    return ReplaySubject;\n}(Subject));\nexport { ReplaySubject };\nvar ReplayEvent = /*@__PURE__*/ (function () {\n    function ReplayEvent(time, value) {\n        this.time = time;\n        this.value = value;\n    }\n    return ReplayEvent;\n}());\n//# sourceMappingURL=ReplaySubject.js.map\n","/** PURE_IMPORTS_START _ReplaySubject PURE_IMPORTS_END */\nimport { ReplaySubject } from '../ReplaySubject';\nexport function shareReplay(configOrBufferSize, windowTime, scheduler) {\n    var config;\n    if (configOrBufferSize && typeof configOrBufferSize === 'object') {\n        config = configOrBufferSize;\n    }\n    else {\n        config = {\n            bufferSize: configOrBufferSize,\n            windowTime: windowTime,\n            refCount: false,\n            scheduler: scheduler\n        };\n    }\n    return function (source) { return source.lift(shareReplayOperator(config)); };\n}\nfunction shareReplayOperator(_a) {\n    var _b = _a.bufferSize, bufferSize = _b === void 0 ? Number.POSITIVE_INFINITY : _b, _c = _a.windowTime, windowTime = _c === void 0 ? Number.POSITIVE_INFINITY : _c, useRefCount = _a.refCount, scheduler = _a.scheduler;\n    var subject;\n    var refCount = 0;\n    var subscription;\n    var hasError = false;\n    var isComplete = false;\n    return function shareReplayOperation(source) {\n        refCount++;\n        if (!subject || hasError) {\n            hasError = false;\n            subject = new ReplaySubject(bufferSize, windowTime, scheduler);\n            subscription = source.subscribe({\n                next: function (value) { subject.next(value); },\n                error: function (err) {\n                    hasError = true;\n                    subject.error(err);\n                },\n                complete: function () {\n                    isComplete = true;\n                    subject.complete();\n                },\n            });\n        }\n        var innerSub = subject.subscribe(this);\n        this.add(function () {\n            refCount--;\n            innerSub.unsubscribe();\n            if (subscription && !isComplete && useRefCount && refCount === 0) {\n                subscription.unsubscribe();\n                subscription = undefined;\n                subject = undefined;\n            }\n        });\n    };\n}\n//# sourceMappingURL=shareReplay.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function filter(predicate, thisArg) {\n    return function filterOperatorFunction(source) {\n        return source.lift(new FilterOperator(predicate, thisArg));\n    };\n}\nvar FilterOperator = /*@__PURE__*/ (function () {\n    function FilterOperator(predicate, thisArg) {\n        this.predicate = predicate;\n        this.thisArg = thisArg;\n    }\n    FilterOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new FilterSubscriber(subscriber, this.predicate, this.thisArg));\n    };\n    return FilterOperator;\n}());\nvar FilterSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(FilterSubscriber, _super);\n    function FilterSubscriber(destination, predicate, thisArg) {\n        var _this = _super.call(this, destination) || this;\n        _this.predicate = predicate;\n        _this.thisArg = thisArg;\n        _this.count = 0;\n        return _this;\n    }\n    FilterSubscriber.prototype._next = function (value) {\n        var result;\n        try {\n            result = this.predicate.call(this.thisArg, value, this.count++);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        if (result) {\n            this.destination.next(value);\n        }\n    };\n    return FilterSubscriber;\n}(Subscriber));\n//# sourceMappingURL=filter.js.map\n","/** PURE_IMPORTS_START _map PURE_IMPORTS_END */\nimport { map } from './map';\nexport function pluck() {\n    var properties = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        properties[_i] = arguments[_i];\n    }\n    var length = properties.length;\n    if (length === 0) {\n        throw new Error('list of properties cannot be empty.');\n    }\n    return function (source) { return map(plucker(properties, length))(source); };\n}\nfunction plucker(props, length) {\n    var mapper = function (x) {\n        var currentProp = x;\n        for (var i = 0; i < length; i++) {\n            var p = currentProp[props[i]];\n            if (typeof p !== 'undefined') {\n                currentProp = p;\n            }\n            else {\n                return undefined;\n            }\n        }\n        return currentProp;\n    };\n    return mapper;\n}\n//# sourceMappingURL=pluck.js.map\n","/** PURE_IMPORTS_START _AsyncAction,_AsyncScheduler PURE_IMPORTS_END */\nimport { AsyncAction } from './AsyncAction';\nimport { AsyncScheduler } from './AsyncScheduler';\nexport var async = /*@__PURE__*/ new AsyncScheduler(AsyncAction);\n//# sourceMappingURL=async.js.map\n","/** PURE_IMPORTS_START tslib,_scheduler_async,_util_isDate,_Subscriber,_Notification PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { async } from '../scheduler/async';\nimport { isDate } from '../util/isDate';\nimport { Subscriber } from '../Subscriber';\nimport { Notification } from '../Notification';\nexport function delay(delay, scheduler) {\n    if (scheduler === void 0) {\n        scheduler = async;\n    }\n    var absoluteDelay = isDate(delay);\n    var delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);\n    return function (source) { return source.lift(new DelayOperator(delayFor, scheduler)); };\n}\nvar DelayOperator = /*@__PURE__*/ (function () {\n    function DelayOperator(delay, scheduler) {\n        this.delay = delay;\n        this.scheduler = scheduler;\n    }\n    DelayOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));\n    };\n    return DelayOperator;\n}());\nvar DelaySubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(DelaySubscriber, _super);\n    function DelaySubscriber(destination, delay, scheduler) {\n        var _this = _super.call(this, destination) || this;\n        _this.delay = delay;\n        _this.scheduler = scheduler;\n        _this.queue = [];\n        _this.active = false;\n        _this.errored = false;\n        return _this;\n    }\n    DelaySubscriber.dispatch = function (state) {\n        var source = state.source;\n        var queue = source.queue;\n        var scheduler = state.scheduler;\n        var destination = state.destination;\n        while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {\n            queue.shift().notification.observe(destination);\n        }\n        if (queue.length > 0) {\n            var delay_1 = Math.max(0, queue[0].time - scheduler.now());\n            this.schedule(state, delay_1);\n        }\n        else {\n            this.unsubscribe();\n            source.active = false;\n        }\n    };\n    DelaySubscriber.prototype._schedule = function (scheduler) {\n        this.active = true;\n        var destination = this.destination;\n        destination.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {\n            source: this, destination: this.destination, scheduler: scheduler\n        }));\n    };\n    DelaySubscriber.prototype.scheduleNotification = function (notification) {\n        if (this.errored === true) {\n            return;\n        }\n        var scheduler = this.scheduler;\n        var message = new DelayMessage(scheduler.now() + this.delay, notification);\n        this.queue.push(message);\n        if (this.active === false) {\n            this._schedule(scheduler);\n        }\n    };\n    DelaySubscriber.prototype._next = function (value) {\n        this.scheduleNotification(Notification.createNext(value));\n    };\n    DelaySubscriber.prototype._error = function (err) {\n        this.errored = true;\n        this.queue = [];\n        this.destination.error(err);\n        this.unsubscribe();\n    };\n    DelaySubscriber.prototype._complete = function () {\n        this.scheduleNotification(Notification.createComplete());\n        this.unsubscribe();\n    };\n    return DelaySubscriber;\n}(Subscriber));\nvar DelayMessage = /*@__PURE__*/ (function () {\n    function DelayMessage(time, notification) {\n        this.time = time;\n        this.notification = notification;\n    }\n    return DelayMessage;\n}());\n//# sourceMappingURL=delay.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isDate(value) {\n    return value instanceof Date && !isNaN(+value);\n}\n//# sourceMappingURL=isDate.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function distinctUntilChanged(compare, keySelector) {\n    return function (source) { return source.lift(new DistinctUntilChangedOperator(compare, keySelector)); };\n}\nvar DistinctUntilChangedOperator = /*@__PURE__*/ (function () {\n    function DistinctUntilChangedOperator(compare, keySelector) {\n        this.compare = compare;\n        this.keySelector = keySelector;\n    }\n    DistinctUntilChangedOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));\n    };\n    return DistinctUntilChangedOperator;\n}());\nvar DistinctUntilChangedSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(DistinctUntilChangedSubscriber, _super);\n    function DistinctUntilChangedSubscriber(destination, compare, keySelector) {\n        var _this = _super.call(this, destination) || this;\n        _this.keySelector = keySelector;\n        _this.hasKey = false;\n        if (typeof compare === 'function') {\n            _this.compare = compare;\n        }\n        return _this;\n    }\n    DistinctUntilChangedSubscriber.prototype.compare = function (x, y) {\n        return x === y;\n    };\n    DistinctUntilChangedSubscriber.prototype._next = function (value) {\n        var key;\n        try {\n            var keySelector = this.keySelector;\n            key = keySelector ? keySelector(value) : value;\n        }\n        catch (err) {\n            return this.destination.error(err);\n        }\n        var result = false;\n        if (this.hasKey) {\n            try {\n                var compare = this.compare;\n                result = compare(this.key, key);\n            }\n            catch (err) {\n                return this.destination.error(err);\n            }\n        }\n        else {\n            this.hasKey = true;\n        }\n        if (!result) {\n            this.key = key;\n            this.destination.next(value);\n        }\n    };\n    return DistinctUntilChangedSubscriber;\n}(Subscriber));\n//# sourceMappingURL=distinctUntilChanged.js.map\n","/** PURE_IMPORTS_START _distinctUntilChanged PURE_IMPORTS_END */\nimport { distinctUntilChanged } from './distinctUntilChanged';\nexport function distinctUntilKeyChanged(key, compare) {\n    return distinctUntilChanged(function (x, y) { return compare ? compare(x[key], y[key]) : x[key] === y[key]; });\n}\n//# sourceMappingURL=distinctUntilKeyChanged.js.map\n","/** PURE_IMPORTS_START _switchMap PURE_IMPORTS_END */\nimport { switchMap } from './switchMap';\nexport function switchMapTo(innerObservable, resultSelector) {\n    return resultSelector ? switchMap(function () { return innerObservable; }, resultSelector) : switchMap(function () { return innerObservable; });\n}\n//# sourceMappingURL=switchMapTo.js.map\n","/** PURE_IMPORTS_START _Observable,_util_noop PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { noop } from '../util/noop';\nexport var NEVER = /*@__PURE__*/ new Observable(noop);\nexport function never() {\n    return NEVER;\n}\n//# sourceMappingURL=never.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function scan(accumulator, seed) {\n    var hasSeed = false;\n    if (arguments.length >= 2) {\n        hasSeed = true;\n    }\n    return function scanOperatorFunction(source) {\n        return source.lift(new ScanOperator(accumulator, seed, hasSeed));\n    };\n}\nvar ScanOperator = /*@__PURE__*/ (function () {\n    function ScanOperator(accumulator, seed, hasSeed) {\n        if (hasSeed === void 0) {\n            hasSeed = false;\n        }\n        this.accumulator = accumulator;\n        this.seed = seed;\n        this.hasSeed = hasSeed;\n    }\n    ScanOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));\n    };\n    return ScanOperator;\n}());\nvar ScanSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ScanSubscriber, _super);\n    function ScanSubscriber(destination, accumulator, _seed, hasSeed) {\n        var _this = _super.call(this, destination) || this;\n        _this.accumulator = accumulator;\n        _this._seed = _seed;\n        _this.hasSeed = hasSeed;\n        _this.index = 0;\n        return _this;\n    }\n    Object.defineProperty(ScanSubscriber.prototype, \"seed\", {\n        get: function () {\n            return this._seed;\n        },\n        set: function (value) {\n            this.hasSeed = true;\n            this._seed = value;\n        },\n        enumerable: true,\n        configurable: true\n    });\n    ScanSubscriber.prototype._next = function (value) {\n        if (!this.hasSeed) {\n            this.seed = value;\n            this.destination.next(value);\n        }\n        else {\n            return this._tryNext(value);\n        }\n    };\n    ScanSubscriber.prototype._tryNext = function (value) {\n        var index = this.index++;\n        var result;\n        try {\n            result = this.accumulator(this.seed, value, index);\n        }\n        catch (err) {\n            this.destination.error(err);\n        }\n        this.seed = result;\n        this.destination.next(result);\n    };\n    return ScanSubscriber;\n}(Subscriber));\n//# sourceMappingURL=scan.js.map\n","/** PURE_IMPORTS_START tslib,_.._util_root,_.._Observable,_.._Subscriber,_.._operators_map PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { root } from '../../util/root';\nimport { Observable } from '../../Observable';\nimport { Subscriber } from '../../Subscriber';\nimport { map } from '../../operators/map';\nfunction getCORSRequest() {\n    if (root.XMLHttpRequest) {\n        return new root.XMLHttpRequest();\n    }\n    else if (!!root.XDomainRequest) {\n        return new root.XDomainRequest();\n    }\n    else {\n        throw new Error('CORS is not supported by your browser');\n    }\n}\nfunction getXMLHttpRequest() {\n    if (root.XMLHttpRequest) {\n        return new root.XMLHttpRequest();\n    }\n    else {\n        var progId = void 0;\n        try {\n            var progIds = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];\n            for (var i = 0; i < 3; i++) {\n                try {\n                    progId = progIds[i];\n                    if (new root.ActiveXObject(progId)) {\n                        break;\n                    }\n                }\n                catch (e) {\n                }\n            }\n            return new root.ActiveXObject(progId);\n        }\n        catch (e) {\n            throw new Error('XMLHttpRequest is not supported by your browser');\n        }\n    }\n}\nexport function ajaxGet(url, headers) {\n    if (headers === void 0) {\n        headers = null;\n    }\n    return new AjaxObservable({ method: 'GET', url: url, headers: headers });\n}\nexport function ajaxPost(url, body, headers) {\n    return new AjaxObservable({ method: 'POST', url: url, body: body, headers: headers });\n}\nexport function ajaxDelete(url, headers) {\n    return new AjaxObservable({ method: 'DELETE', url: url, headers: headers });\n}\nexport function ajaxPut(url, body, headers) {\n    return new AjaxObservable({ method: 'PUT', url: url, body: body, headers: headers });\n}\nexport function ajaxPatch(url, body, headers) {\n    return new AjaxObservable({ method: 'PATCH', url: url, body: body, headers: headers });\n}\nvar mapResponse = /*@__PURE__*/ map(function (x, index) { return x.response; });\nexport function ajaxGetJSON(url, headers) {\n    return mapResponse(new AjaxObservable({\n        method: 'GET',\n        url: url,\n        responseType: 'json',\n        headers: headers\n    }));\n}\nvar AjaxObservable = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AjaxObservable, _super);\n    function AjaxObservable(urlOrRequest) {\n        var _this = _super.call(this) || this;\n        var request = {\n            async: true,\n            createXHR: function () {\n                return this.crossDomain ? getCORSRequest() : getXMLHttpRequest();\n            },\n            crossDomain: true,\n            withCredentials: false,\n            headers: {},\n            method: 'GET',\n            responseType: 'json',\n            timeout: 0\n        };\n        if (typeof urlOrRequest === 'string') {\n            request.url = urlOrRequest;\n        }\n        else {\n            for (var prop in urlOrRequest) {\n                if (urlOrRequest.hasOwnProperty(prop)) {\n                    request[prop] = urlOrRequest[prop];\n                }\n            }\n        }\n        _this.request = request;\n        return _this;\n    }\n    AjaxObservable.prototype._subscribe = function (subscriber) {\n        return new AjaxSubscriber(subscriber, this.request);\n    };\n    AjaxObservable.create = (function () {\n        var create = function (urlOrRequest) {\n            return new AjaxObservable(urlOrRequest);\n        };\n        create.get = ajaxGet;\n        create.post = ajaxPost;\n        create.delete = ajaxDelete;\n        create.put = ajaxPut;\n        create.patch = ajaxPatch;\n        create.getJSON = ajaxGetJSON;\n        return create;\n    })();\n    return AjaxObservable;\n}(Observable));\nexport { AjaxObservable };\nvar AjaxSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AjaxSubscriber, _super);\n    function AjaxSubscriber(destination, request) {\n        var _this = _super.call(this, destination) || this;\n        _this.request = request;\n        _this.done = false;\n        var headers = request.headers = request.headers || {};\n        if (!request.crossDomain && !_this.getHeader(headers, 'X-Requested-With')) {\n            headers['X-Requested-With'] = 'XMLHttpRequest';\n        }\n        var contentTypeHeader = _this.getHeader(headers, 'Content-Type');\n        if (!contentTypeHeader && !(root.FormData && request.body instanceof root.FormData) && typeof request.body !== 'undefined') {\n            headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';\n        }\n        request.body = _this.serializeBody(request.body, _this.getHeader(request.headers, 'Content-Type'));\n        _this.send();\n        return _this;\n    }\n    AjaxSubscriber.prototype.next = function (e) {\n        this.done = true;\n        var _a = this, xhr = _a.xhr, request = _a.request, destination = _a.destination;\n        var result;\n        try {\n            result = new AjaxResponse(e, xhr, request);\n        }\n        catch (err) {\n            return destination.error(err);\n        }\n        destination.next(result);\n    };\n    AjaxSubscriber.prototype.send = function () {\n        var _a = this, request = _a.request, _b = _a.request, user = _b.user, method = _b.method, url = _b.url, async = _b.async, password = _b.password, headers = _b.headers, body = _b.body;\n        try {\n            var xhr = this.xhr = request.createXHR();\n            this.setupEvents(xhr, request);\n            if (user) {\n                xhr.open(method, url, async, user, password);\n            }\n            else {\n                xhr.open(method, url, async);\n            }\n            if (async) {\n                xhr.timeout = request.timeout;\n                xhr.responseType = request.responseType;\n            }\n            if ('withCredentials' in xhr) {\n                xhr.withCredentials = !!request.withCredentials;\n            }\n            this.setHeaders(xhr, headers);\n            if (body) {\n                xhr.send(body);\n            }\n            else {\n                xhr.send();\n            }\n        }\n        catch (err) {\n            this.error(err);\n        }\n    };\n    AjaxSubscriber.prototype.serializeBody = function (body, contentType) {\n        if (!body || typeof body === 'string') {\n            return body;\n        }\n        else if (root.FormData && body instanceof root.FormData) {\n            return body;\n        }\n        if (contentType) {\n            var splitIndex = contentType.indexOf(';');\n            if (splitIndex !== -1) {\n                contentType = contentType.substring(0, splitIndex);\n            }\n        }\n        switch (contentType) {\n            case 'application/x-www-form-urlencoded':\n                return Object.keys(body).map(function (key) { return encodeURIComponent(key) + \"=\" + encodeURIComponent(body[key]); }).join('&');\n            case 'application/json':\n                return JSON.stringify(body);\n            default:\n                return body;\n        }\n    };\n    AjaxSubscriber.prototype.setHeaders = function (xhr, headers) {\n        for (var key in headers) {\n            if (headers.hasOwnProperty(key)) {\n                xhr.setRequestHeader(key, headers[key]);\n            }\n        }\n    };\n    AjaxSubscriber.prototype.getHeader = function (headers, headerName) {\n        for (var key in headers) {\n            if (key.toLowerCase() === headerName.toLowerCase()) {\n                return headers[key];\n            }\n        }\n        return undefined;\n    };\n    AjaxSubscriber.prototype.setupEvents = function (xhr, request) {\n        var progressSubscriber = request.progressSubscriber;\n        function xhrTimeout(e) {\n            var _a = xhrTimeout, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;\n            if (progressSubscriber) {\n                progressSubscriber.error(e);\n            }\n            var error;\n            try {\n                error = new AjaxTimeoutError(this, request);\n            }\n            catch (err) {\n                error = err;\n            }\n            subscriber.error(error);\n        }\n        xhr.ontimeout = xhrTimeout;\n        xhrTimeout.request = request;\n        xhrTimeout.subscriber = this;\n        xhrTimeout.progressSubscriber = progressSubscriber;\n        if (xhr.upload && 'withCredentials' in xhr) {\n            if (progressSubscriber) {\n                var xhrProgress_1;\n                xhrProgress_1 = function (e) {\n                    var progressSubscriber = xhrProgress_1.progressSubscriber;\n                    progressSubscriber.next(e);\n                };\n                if (root.XDomainRequest) {\n                    xhr.onprogress = xhrProgress_1;\n                }\n                else {\n                    xhr.upload.onprogress = xhrProgress_1;\n                }\n                xhrProgress_1.progressSubscriber = progressSubscriber;\n            }\n            var xhrError_1;\n            xhrError_1 = function (e) {\n                var _a = xhrError_1, progressSubscriber = _a.progressSubscriber, subscriber = _a.subscriber, request = _a.request;\n                if (progressSubscriber) {\n                    progressSubscriber.error(e);\n                }\n                var error;\n                try {\n                    error = new AjaxError('ajax error', this, request);\n                }\n                catch (err) {\n                    error = err;\n                }\n                subscriber.error(error);\n            };\n            xhr.onerror = xhrError_1;\n            xhrError_1.request = request;\n            xhrError_1.subscriber = this;\n            xhrError_1.progressSubscriber = progressSubscriber;\n        }\n        function xhrReadyStateChange(e) {\n            return;\n        }\n        xhr.onreadystatechange = xhrReadyStateChange;\n        xhrReadyStateChange.subscriber = this;\n        xhrReadyStateChange.progressSubscriber = progressSubscriber;\n        xhrReadyStateChange.request = request;\n        function xhrLoad(e) {\n            var _a = xhrLoad, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;\n            if (this.readyState === 4) {\n                var status_1 = this.status === 1223 ? 204 : this.status;\n                var response = (this.responseType === 'text' ? (this.response || this.responseText) : this.response);\n                if (status_1 === 0) {\n                    status_1 = response ? 200 : 0;\n                }\n                if (status_1 < 400) {\n                    if (progressSubscriber) {\n                        progressSubscriber.complete();\n                    }\n                    subscriber.next(e);\n                    subscriber.complete();\n                }\n                else {\n                    if (progressSubscriber) {\n                        progressSubscriber.error(e);\n                    }\n                    var error = void 0;\n                    try {\n                        error = new AjaxError('ajax error ' + status_1, this, request);\n                    }\n                    catch (err) {\n                        error = err;\n                    }\n                    subscriber.error(error);\n                }\n            }\n        }\n        xhr.onload = xhrLoad;\n        xhrLoad.subscriber = this;\n        xhrLoad.progressSubscriber = progressSubscriber;\n        xhrLoad.request = request;\n    };\n    AjaxSubscriber.prototype.unsubscribe = function () {\n        var _a = this, done = _a.done, xhr = _a.xhr;\n        if (!done && xhr && xhr.readyState !== 4 && typeof xhr.abort === 'function') {\n            xhr.abort();\n        }\n        _super.prototype.unsubscribe.call(this);\n    };\n    return AjaxSubscriber;\n}(Subscriber));\nexport { AjaxSubscriber };\nvar AjaxResponse = /*@__PURE__*/ (function () {\n    function AjaxResponse(originalEvent, xhr, request) {\n        this.originalEvent = originalEvent;\n        this.xhr = xhr;\n        this.request = request;\n        this.status = xhr.status;\n        this.responseType = xhr.responseType || request.responseType;\n        this.response = parseXhrResponse(this.responseType, xhr);\n    }\n    return AjaxResponse;\n}());\nexport { AjaxResponse };\nvar AjaxErrorImpl = /*@__PURE__*/ (function () {\n    function AjaxErrorImpl(message, xhr, request) {\n        Error.call(this);\n        this.message = message;\n        this.name = 'AjaxError';\n        this.xhr = xhr;\n        this.request = request;\n        this.status = xhr.status;\n        this.responseType = xhr.responseType || request.responseType;\n        this.response = parseXhrResponse(this.responseType, xhr);\n        return this;\n    }\n    AjaxErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return AjaxErrorImpl;\n})();\nexport var AjaxError = AjaxErrorImpl;\nfunction parseJson(xhr) {\n    if ('response' in xhr) {\n        return xhr.responseType ? xhr.response : JSON.parse(xhr.response || xhr.responseText || 'null');\n    }\n    else {\n        return JSON.parse(xhr.responseText || 'null');\n    }\n}\nfunction parseXhrResponse(responseType, xhr) {\n    switch (responseType) {\n        case 'json':\n            return parseJson(xhr);\n        case 'xml':\n            return xhr.responseXML;\n        case 'text':\n        default:\n            return ('response' in xhr) ? xhr.response : xhr.responseText;\n    }\n}\nfunction AjaxTimeoutErrorImpl(xhr, request) {\n    AjaxError.call(this, 'ajax timeout', xhr, request);\n    this.name = 'AjaxTimeoutError';\n    return this;\n}\nexport var AjaxTimeoutError = AjaxTimeoutErrorImpl;\n//# sourceMappingURL=AjaxObservable.js.map\n","/** PURE_IMPORTS_START _AjaxObservable PURE_IMPORTS_END */\nimport { AjaxObservable } from './AjaxObservable';\nexport var ajax = /*@__PURE__*/ (function () { return AjaxObservable.create; })();\n//# sourceMappingURL=ajax.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function mapTo(value) {\n    return function (source) { return source.lift(new MapToOperator(value)); };\n}\nvar MapToOperator = /*@__PURE__*/ (function () {\n    function MapToOperator(value) {\n        this.value = value;\n    }\n    MapToOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new MapToSubscriber(subscriber, this.value));\n    };\n    return MapToOperator;\n}());\nvar MapToSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MapToSubscriber, _super);\n    function MapToSubscriber(destination, value) {\n        var _this = _super.call(this, destination) || this;\n        _this.value = value;\n        return _this;\n    }\n    MapToSubscriber.prototype._next = function (x) {\n        this.destination.next(this.value);\n    };\n    return MapToSubscriber;\n}(Subscriber));\n//# sourceMappingURL=mapTo.js.map\n","/** PURE_IMPORTS_START _of,_operators_concatAll PURE_IMPORTS_END */\nimport { of } from './of';\nimport { concatAll } from '../operators/concatAll';\nexport function concat() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    return concatAll()(of.apply(void 0, observables));\n}\n//# sourceMappingURL=concat.js.map\n","/** PURE_IMPORTS_START _mergeAll PURE_IMPORTS_END */\nimport { mergeAll } from './mergeAll';\nexport function concatAll() {\n    return mergeAll(1);\n}\n//# sourceMappingURL=concatAll.js.map\n","/** PURE_IMPORTS_START _observable_concat,_util_isScheduler PURE_IMPORTS_END */\nimport { concat } from '../observable/concat';\nimport { isScheduler } from '../util/isScheduler';\nexport function startWith() {\n    var array = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        array[_i] = arguments[_i];\n    }\n    var scheduler = array[array.length - 1];\n    if (isScheduler(scheduler)) {\n        array.pop();\n        return function (source) { return concat(array, source, scheduler); };\n    }\n    else {\n        return function (source) { return concat(array, source); };\n    }\n}\n//# sourceMappingURL=startWith.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function skip(count) {\n    return function (source) { return source.lift(new SkipOperator(count)); };\n}\nvar SkipOperator = /*@__PURE__*/ (function () {\n    function SkipOperator(total) {\n        this.total = total;\n    }\n    SkipOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new SkipSubscriber(subscriber, this.total));\n    };\n    return SkipOperator;\n}());\nvar SkipSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SkipSubscriber, _super);\n    function SkipSubscriber(destination, total) {\n        var _this = _super.call(this, destination) || this;\n        _this.total = total;\n        _this.count = 0;\n        return _this;\n    }\n    SkipSubscriber.prototype._next = function (x) {\n        if (++this.count > this.total) {\n            this.destination.next(x);\n        }\n    };\n    return SkipSubscriber;\n}(Subscriber));\n//# sourceMappingURL=skip.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport {\n  distinctUntilChanged,\n  map,\n  mapTo,\n  pluck,\n  shareReplay,\n  skip,\n  startWith,\n  switchMap\n} from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Switch options\n */\ninterface SwitchOptions {\n  location$: Observable<string>        /* Location observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for document load events\n */\nconst load$ = fromEvent(document, \"DOMContentLoaded\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch document\n *\n * @return Document observable\n */\nexport function watchDocument(): Observable<Document> {\n  return load$\n    .pipe(\n      mapTo(document),\n      shareReplay(1)\n    )\n}\n\n/**\n * Watch document switch\n *\n * This function returns an observables that fetches a document if the provided\n * location observable emits a new value (i.e. URL). If the emitted URL points\n * to the same page, the request is effectively ignored (e.g. when only the\n * fragment identifier changes).\n *\n * @param options - Options\n *\n * @return Document switch observable\n */\nexport function watchDocumentSwitch(\n  { location$ }: SwitchOptions\n): Observable<Document> {\n  return location$\n    .pipe(\n      startWith(location.href),\n      map(url => url.replace(/#[^#]+$/, \"\")),\n      distinctUntilChanged(),\n      skip(1),\n\n      /* Fetch document */\n      switchMap(url => ajax({\n        url,\n        responseType: \"document\",\n        withCredentials: true\n      })\n        .pipe<Document>(\n          pluck(\"response\")\n        )\n      ),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve an element matching the query selector\n *\n * @template T - Element type\n *\n * @param selector - Query selector\n * @param node - Node of reference\n *\n * @return Element\n */\nexport function getElement<T extends HTMLElement>(\n  selector: string, node: ParentNode = document\n): T | undefined {\n  return node.querySelector<T>(selector) || undefined\n}\n\n/**\n * Retrieve all elements matching the query selector\n *\n * @template T - Element type\n *\n * @param selector - Query selector\n * @param node - Node of reference\n *\n * @return Elements\n */\nexport function getElements<T extends HTMLElement>(\n  selector: string, node: ParentNode = document\n): T[] {\n  return Array.from(node.querySelectorAll<T>(selector))\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent, merge } from \"rxjs\"\nimport {\n  distinctUntilKeyChanged,\n  map,\n  shareReplay,\n  startWith\n} from \"rxjs/operators\"\n\nimport { Viewport } from \"../../viewport\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Element offset\n */\nexport interface ElementOffset {\n  x: number                            /* Horizontal offset */\n  y: number                            /* Vertical offset */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve element offset\n *\n * @param el - Element\n *\n * @return Element offset\n */\nexport function getElementOffset(el: HTMLElement): ElementOffset {\n  return {\n    x: el.scrollLeft,\n    y: el.scrollTop\n  }\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch element offset\n *\n * @param el - Element\n * @param options - Options\n *\n * @return Element offset observable\n */\nexport function watchElementOffset(\n  el: HTMLElement, { viewport$ }: Options\n): Observable<ElementOffset> {\n  const scroll$ = fromEvent(el, \"scroll\")\n  const size$ = viewport$\n    .pipe(\n      distinctUntilKeyChanged(\"size\")\n    )\n\n  /* Merge into a single hot observable */\n  return merge(scroll$, size$)\n    .pipe(\n      map(() => getElementOffset(el)),\n      startWith(getElementOffset(el)),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function refCount() {\n    return function refCountOperatorFunction(source) {\n        return source.lift(new RefCountOperator(source));\n    };\n}\nvar RefCountOperator = /*@__PURE__*/ (function () {\n    function RefCountOperator(connectable) {\n        this.connectable = connectable;\n    }\n    RefCountOperator.prototype.call = function (subscriber, source) {\n        var connectable = this.connectable;\n        connectable._refCount++;\n        var refCounter = new RefCountSubscriber(subscriber, connectable);\n        var subscription = source.subscribe(refCounter);\n        if (!refCounter.closed) {\n            refCounter.connection = connectable.connect();\n        }\n        return subscription;\n    };\n    return RefCountOperator;\n}());\nvar RefCountSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(RefCountSubscriber, _super);\n    function RefCountSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    RefCountSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (!connectable) {\n            this.connection = null;\n            return;\n        }\n        this.connectable = null;\n        var refCount = connectable._refCount;\n        if (refCount <= 0) {\n            this.connection = null;\n            return;\n        }\n        connectable._refCount = refCount - 1;\n        if (refCount > 1) {\n            this.connection = null;\n            return;\n        }\n        var connection = this.connection;\n        var sharedConnection = connectable._connection;\n        this.connection = null;\n        if (sharedConnection && (!connection || sharedConnection === connection)) {\n            sharedConnection.unsubscribe();\n        }\n    };\n    return RefCountSubscriber;\n}(Subscriber));\n//# sourceMappingURL=refCount.js.map\n","/** PURE_IMPORTS_START tslib,_Subject,_Observable,_Subscriber,_Subscription,_operators_refCount PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { SubjectSubscriber } from '../Subject';\nimport { Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { refCount as higherOrderRefCount } from '../operators/refCount';\nvar ConnectableObservable = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ConnectableObservable, _super);\n    function ConnectableObservable(source, subjectFactory) {\n        var _this = _super.call(this) || this;\n        _this.source = source;\n        _this.subjectFactory = subjectFactory;\n        _this._refCount = 0;\n        _this._isComplete = false;\n        return _this;\n    }\n    ConnectableObservable.prototype._subscribe = function (subscriber) {\n        return this.getSubject().subscribe(subscriber);\n    };\n    ConnectableObservable.prototype.getSubject = function () {\n        var subject = this._subject;\n        if (!subject || subject.isStopped) {\n            this._subject = this.subjectFactory();\n        }\n        return this._subject;\n    };\n    ConnectableObservable.prototype.connect = function () {\n        var connection = this._connection;\n        if (!connection) {\n            this._isComplete = false;\n            connection = this._connection = new Subscription();\n            connection.add(this.source\n                .subscribe(new ConnectableSubscriber(this.getSubject(), this)));\n            if (connection.closed) {\n                this._connection = null;\n                connection = Subscription.EMPTY;\n            }\n        }\n        return connection;\n    };\n    ConnectableObservable.prototype.refCount = function () {\n        return higherOrderRefCount()(this);\n    };\n    return ConnectableObservable;\n}(Observable));\nexport { ConnectableObservable };\nexport var connectableObservableDescriptor = /*@__PURE__*/ (function () {\n    var connectableProto = ConnectableObservable.prototype;\n    return {\n        operator: { value: null },\n        _refCount: { value: 0, writable: true },\n        _subject: { value: null, writable: true },\n        _connection: { value: null, writable: true },\n        _subscribe: { value: connectableProto._subscribe },\n        _isComplete: { value: connectableProto._isComplete, writable: true },\n        getSubject: { value: connectableProto.getSubject },\n        connect: { value: connectableProto.connect },\n        refCount: { value: connectableProto.refCount }\n    };\n})();\nvar ConnectableSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ConnectableSubscriber, _super);\n    function ConnectableSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    ConnectableSubscriber.prototype._error = function (err) {\n        this._unsubscribe();\n        _super.prototype._error.call(this, err);\n    };\n    ConnectableSubscriber.prototype._complete = function () {\n        this.connectable._isComplete = true;\n        this._unsubscribe();\n        _super.prototype._complete.call(this);\n    };\n    ConnectableSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (connectable) {\n            this.connectable = null;\n            var connection = connectable._connection;\n            connectable._refCount = 0;\n            connectable._subject = null;\n            connectable._connection = null;\n            if (connection) {\n                connection.unsubscribe();\n            }\n        }\n    };\n    return ConnectableSubscriber;\n}(SubjectSubscriber));\nvar RefCountOperator = /*@__PURE__*/ (function () {\n    function RefCountOperator(connectable) {\n        this.connectable = connectable;\n    }\n    RefCountOperator.prototype.call = function (subscriber, source) {\n        var connectable = this.connectable;\n        connectable._refCount++;\n        var refCounter = new RefCountSubscriber(subscriber, connectable);\n        var subscription = source.subscribe(refCounter);\n        if (!refCounter.closed) {\n            refCounter.connection = connectable.connect();\n        }\n        return subscription;\n    };\n    return RefCountOperator;\n}());\nvar RefCountSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(RefCountSubscriber, _super);\n    function RefCountSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    RefCountSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (!connectable) {\n            this.connection = null;\n            return;\n        }\n        this.connectable = null;\n        var refCount = connectable._refCount;\n        if (refCount <= 0) {\n            this.connection = null;\n            return;\n        }\n        connectable._refCount = refCount - 1;\n        if (refCount > 1) {\n            this.connection = null;\n            return;\n        }\n        var connection = this.connection;\n        var sharedConnection = connectable._connection;\n        this.connection = null;\n        if (sharedConnection && (!connection || sharedConnection === connection)) {\n            sharedConnection.unsubscribe();\n        }\n    };\n    return RefCountSubscriber;\n}(Subscriber));\n//# sourceMappingURL=ConnectableObservable.js.map\n","/** PURE_IMPORTS_START _observable_ConnectableObservable PURE_IMPORTS_END */\nimport { connectableObservableDescriptor } from '../observable/ConnectableObservable';\nexport function multicast(subjectOrSubjectFactory, selector) {\n    return function multicastOperatorFunction(source) {\n        var subjectFactory;\n        if (typeof subjectOrSubjectFactory === 'function') {\n            subjectFactory = subjectOrSubjectFactory;\n        }\n        else {\n            subjectFactory = function subjectFactory() {\n                return subjectOrSubjectFactory;\n            };\n        }\n        if (typeof selector === 'function') {\n            return source.lift(new MulticastOperator(subjectFactory, selector));\n        }\n        var connectable = Object.create(source, connectableObservableDescriptor);\n        connectable.source = source;\n        connectable.subjectFactory = subjectFactory;\n        return connectable;\n    };\n}\nvar MulticastOperator = /*@__PURE__*/ (function () {\n    function MulticastOperator(subjectFactory, selector) {\n        this.subjectFactory = subjectFactory;\n        this.selector = selector;\n    }\n    MulticastOperator.prototype.call = function (subscriber, source) {\n        var selector = this.selector;\n        var subject = this.subjectFactory();\n        var subscription = selector(subject).subscribe(subscriber);\n        subscription.add(source.subscribe(subject));\n        return subscription;\n    };\n    return MulticastOperator;\n}());\nexport { MulticastOperator };\n//# sourceMappingURL=multicast.js.map\n","/** PURE_IMPORTS_START _multicast,_refCount,_Subject PURE_IMPORTS_END */\nimport { multicast } from './multicast';\nimport { refCount } from './refCount';\nimport { Subject } from '../Subject';\nfunction shareSubjectFactory() {\n    return new Subject();\n}\nexport function share() {\n    return function (source) { return refCount()(multicast(shareSubjectFactory)(source)); };\n}\n//# sourceMappingURL=share.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { filter, map, share } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Key\n */\nexport interface Key {\n  type: string                         /* Key type */\n  claim(): void                        /* Key claim */\n}\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for window keyboard events\n */\nconst keydown$ = fromEvent<KeyboardEvent>(window, \"keydown\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch keyboard\n *\n * @return Keyboard observable\n */\nexport function watchKeyboard(): Observable<Key> {\n  return keydown$\n    .pipe(\n      filter(ev => !(ev.shiftKey || ev.metaKey || ev.ctrlKey)),\n      map(ev => ({\n        type: ev.code,\n        claim() {\n          ev.preventDefault()\n          ev.stopPropagation()\n        }\n      })),\n      share()\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, Subject, fromEvent } from \"rxjs\"\nimport { filter, map, share } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for window hash change events\n */\nconst hashchange$ = fromEvent<HashChangeEvent>(window, \"hashchange\")\n\n/**\n * Observable for window pop state events\n */\nconst popstate$ = fromEvent<PopStateEvent>(window, \"popstate\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch location\n *\n * @return Location subject\n */\nexport function watchLocation(): Subject<string> {\n  const location$ = new Subject<string>()\n  popstate$\n    .pipe(\n      map(() => location.href),\n      share()\n    )\n      .subscribe(location$)\n\n  /* Return subject */\n  return location$\n}\n\n/**\n * Watch location hash\n *\n * @return Location hash observable\n */\nexport function watchLocationHash(): Observable<string> {\n  return hashchange$\n    .pipe(\n      map(() => location.hash),\n      filter(hash => hash.length > 0),\n      share()\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEventPattern } from \"rxjs\"\nimport { shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch media query\n *\n * @param query - Media query\n *\n * @return Media observable\n */\nexport function watchMedia(query: string): Observable<boolean> {\n  const media = matchMedia(query)\n  return fromEventPattern<boolean>(next =>\n    media.addListener(() => next(media.matches))\n  )\n    .pipe(\n      startWith(media.matches),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isArray } from '../util/isArray';\nimport { isFunction } from '../util/isFunction';\nimport { map } from '../operators/map';\nexport function fromEventPattern(addHandler, removeHandler, resultSelector) {\n    if (resultSelector) {\n        return fromEventPattern(addHandler, removeHandler).pipe(map(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));\n    }\n    return new Observable(function (subscriber) {\n        var handler = function () {\n            var e = [];\n            for (var _i = 0; _i < arguments.length; _i++) {\n                e[_i] = arguments[_i];\n            }\n            return subscriber.next(e.length === 1 ? e[0] : e);\n        };\n        var retValue;\n        try {\n            retValue = addHandler(handler);\n        }\n        catch (err) {\n            subscriber.error(err);\n            return undefined;\n        }\n        if (!isFunction(removeHandler)) {\n            return undefined;\n        }\n        return function () { return removeHandler(handler, retValue); };\n    });\n}\n//# sourceMappingURL=fromEventPattern.js.map\n","/** PURE_IMPORTS_START tslib,_util_isScheduler,_util_isArray,_OuterSubscriber,_util_subscribeToResult,_fromArray PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { isScheduler } from '../util/isScheduler';\nimport { isArray } from '../util/isArray';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { fromArray } from './fromArray';\nvar NONE = {};\nexport function combineLatest() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    var resultSelector = null;\n    var scheduler = null;\n    if (isScheduler(observables[observables.length - 1])) {\n        scheduler = observables.pop();\n    }\n    if (typeof observables[observables.length - 1] === 'function') {\n        resultSelector = observables.pop();\n    }\n    if (observables.length === 1 && isArray(observables[0])) {\n        observables = observables[0];\n    }\n    return fromArray(observables, scheduler).lift(new CombineLatestOperator(resultSelector));\n}\nvar CombineLatestOperator = /*@__PURE__*/ (function () {\n    function CombineLatestOperator(resultSelector) {\n        this.resultSelector = resultSelector;\n    }\n    CombineLatestOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new CombineLatestSubscriber(subscriber, this.resultSelector));\n    };\n    return CombineLatestOperator;\n}());\nexport { CombineLatestOperator };\nvar CombineLatestSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(CombineLatestSubscriber, _super);\n    function CombineLatestSubscriber(destination, resultSelector) {\n        var _this = _super.call(this, destination) || this;\n        _this.resultSelector = resultSelector;\n        _this.active = 0;\n        _this.values = [];\n        _this.observables = [];\n        return _this;\n    }\n    CombineLatestSubscriber.prototype._next = function (observable) {\n        this.values.push(NONE);\n        this.observables.push(observable);\n    };\n    CombineLatestSubscriber.prototype._complete = function () {\n        var observables = this.observables;\n        var len = observables.length;\n        if (len === 0) {\n            this.destination.complete();\n        }\n        else {\n            this.active = len;\n            this.toRespond = len;\n            for (var i = 0; i < len; i++) {\n                var observable = observables[i];\n                this.add(subscribeToResult(this, observable, observable, i));\n            }\n        }\n    };\n    CombineLatestSubscriber.prototype.notifyComplete = function (unused) {\n        if ((this.active -= 1) === 0) {\n            this.destination.complete();\n        }\n    };\n    CombineLatestSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        var values = this.values;\n        var oldVal = values[outerIndex];\n        var toRespond = !this.toRespond\n            ? 0\n            : oldVal === NONE ? --this.toRespond : this.toRespond;\n        values[outerIndex] = innerValue;\n        if (toRespond === 0) {\n            if (this.resultSelector) {\n                this._tryResultSelector(values);\n            }\n            else {\n                this.destination.next(values.slice());\n            }\n        }\n    };\n    CombineLatestSubscriber.prototype._tryResultSelector = function (values) {\n        var result;\n        try {\n            result = this.resultSelector.apply(this, values);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return CombineLatestSubscriber;\n}(OuterSubscriber));\nexport { CombineLatestSubscriber };\n//# sourceMappingURL=combineLatest.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest, fromEvent, merge } from \"rxjs\"\nimport { map, shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Viewport offset\n */\nexport interface ViewportOffset {\n  x: number                            /* Horizontal offset */\n  y: number                            /* Vertical offset */\n}\n\n/**\n * Viewport size\n */\nexport interface ViewportSize {\n  width: number                        /* Viewport width */\n  height: number                       /* Viewport height */\n}\n\n/**\n * Viewport\n */\nexport interface Viewport {\n  offset: ViewportOffset               /* Viewport offset */\n  size: ViewportSize                   /* Viewport size */\n}\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for window scroll events\n */\nconst scroll$ = fromEvent<UIEvent>(window, \"scroll\")\n\n/**\n * Observable for window resize events\n */\nconst resize$ = fromEvent<UIEvent>(window, \"resize\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve viewport offset\n *\n * @return Viewport offset\n */\nexport function getViewportOffset(): ViewportOffset {\n  return {\n    x: pageXOffset,\n    y: pageYOffset\n  }\n}\n\n/**\n * Retrieve viewport size\n *\n * @return Viewport size\n */\nexport function getViewportSize(): ViewportSize {\n  return {\n    width:  innerWidth,\n    height: innerHeight\n  }\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch viewport offset\n *\n * @return Viewport offset observable\n */\nexport function watchViewportOffset(): Observable<ViewportOffset> {\n  return merge(scroll$, resize$)\n    .pipe(\n      map(getViewportOffset),\n      startWith(getViewportOffset())\n    )\n}\n\n/**\n * Watch viewport size\n *\n * @return Viewport size observable\n */\nexport function watchViewportSize(): Observable<ViewportSize> {\n  return resize$\n    .pipe(\n      map(getViewportSize),\n      startWith(getViewportSize())\n    )\n}\n\n/**\n * Watch viewport\n *\n * @return Viewport observable\n */\nexport function watchViewport(): Observable<Viewport> {\n  return combineLatest([\n    watchViewportOffset(),\n    watchViewportSize()\n  ])\n    .pipe(\n      map(([offset, size]) => ({ offset, size })),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport { Header } from \"../../../header\"\nimport { Viewport } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch viewport relative to element\n *\n * @param el - Element\n * @param options - Options\n *\n * @return Viewport observable\n */\nexport function watchViewportFrom(\n  el: HTMLElement, { header$, viewport$ }: Options\n): Observable<Viewport> {\n  return combineLatest([viewport$, header$])\n    .pipe(\n      map(([{ offset, size }, { height }]) => ({\n        offset: {\n          x: offset.x - el.offsetLeft,\n          y: offset.y - el.offsetTop + height\n        },\n        size\n      })),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport var defaultThrottleConfig = {\n    leading: true,\n    trailing: false\n};\nexport function throttle(durationSelector, config) {\n    if (config === void 0) {\n        config = defaultThrottleConfig;\n    }\n    return function (source) { return source.lift(new ThrottleOperator(durationSelector, config.leading, config.trailing)); };\n}\nvar ThrottleOperator = /*@__PURE__*/ (function () {\n    function ThrottleOperator(durationSelector, leading, trailing) {\n        this.durationSelector = durationSelector;\n        this.leading = leading;\n        this.trailing = trailing;\n    }\n    ThrottleOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing));\n    };\n    return ThrottleOperator;\n}());\nvar ThrottleSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ThrottleSubscriber, _super);\n    function ThrottleSubscriber(destination, durationSelector, _leading, _trailing) {\n        var _this = _super.call(this, destination) || this;\n        _this.destination = destination;\n        _this.durationSelector = durationSelector;\n        _this._leading = _leading;\n        _this._trailing = _trailing;\n        _this._hasValue = false;\n        return _this;\n    }\n    ThrottleSubscriber.prototype._next = function (value) {\n        this._hasValue = true;\n        this._sendValue = value;\n        if (!this._throttled) {\n            if (this._leading) {\n                this.send();\n            }\n            else {\n                this.throttle(value);\n            }\n        }\n    };\n    ThrottleSubscriber.prototype.send = function () {\n        var _a = this, _hasValue = _a._hasValue, _sendValue = _a._sendValue;\n        if (_hasValue) {\n            this.destination.next(_sendValue);\n            this.throttle(_sendValue);\n        }\n        this._hasValue = false;\n        this._sendValue = null;\n    };\n    ThrottleSubscriber.prototype.throttle = function (value) {\n        var duration = this.tryDurationSelector(value);\n        if (!!duration) {\n            this.add(this._throttled = subscribeToResult(this, duration));\n        }\n    };\n    ThrottleSubscriber.prototype.tryDurationSelector = function (value) {\n        try {\n            return this.durationSelector(value);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return null;\n        }\n    };\n    ThrottleSubscriber.prototype.throttlingDone = function () {\n        var _a = this, _throttled = _a._throttled, _trailing = _a._trailing;\n        if (_throttled) {\n            _throttled.unsubscribe();\n        }\n        this._throttled = null;\n        if (_trailing) {\n            this.send();\n        }\n    };\n    ThrottleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.throttlingDone();\n    };\n    ThrottleSubscriber.prototype.notifyComplete = function () {\n        this.throttlingDone();\n    };\n    return ThrottleSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=throttle.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, Subject, fromEvent } from \"rxjs\"\nimport { pluck, share, switchMapTo, tap, throttle } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Worker message\n */\nexport interface WorkerMessage {\n  type: unknown                        /* Message type */\n  data: unknown                        /* Message data */\n}\n\n/**\n * Worker handler\n *\n * @template T - Message type\n */\nexport interface WorkerHandler<\n  T extends WorkerMessage\n> {\n  tx$: Subject<T>                      /* Message transmission subject */\n  rx$: Observable<T>                   /* Message receive observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n *\n * @template T - Worker message type\n */\ninterface Options<T extends WorkerMessage> {\n  tx$: Observable<T>                   /* Message transmission observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch a web worker\n *\n * This function returns an observable that will send all values emitted by the\n * message observable to the web worker. Web worker communication is expected\n * to be bidirectional (request-response) and synchronous. Messages that are\n * emitted during a pending request are throttled, the last one is emitted.\n *\n * @param worker - Web worker\n * @param options - Options\n *\n * @return Worker message observable\n */\nexport function watchWorker<T extends WorkerMessage>(\n  worker: Worker, { tx$ }: Options<T>\n): Observable<T> {\n\n  /* Intercept messages from web worker */\n  const rx$ = fromEvent(worker, \"message\")\n    .pipe(\n      pluck<Event, T>(\"data\")\n    )\n\n  /* Send and receive messages, return hot observable */\n  return tx$\n    .pipe(\n      throttle(() => rx$, { leading: true, trailing: true }),\n      tap(message => worker.postMessage(message)),\n      switchMapTo(rx$),\n      share()\n    )\n}\n","import _curry1 from './internal/_curry1.js';\nimport _isString from './internal/_isString.js';\n\n/**\n * Returns a new list or string with the elements or characters in reverse\n * order.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category List\n * @sig [a] -> [a]\n * @sig String -> String\n * @param {Array|String} list\n * @return {Array|String}\n * @example\n *\n *      R.reverse([1, 2, 3]);  //=> [3, 2, 1]\n *      R.reverse([1, 2]);     //=> [2, 1]\n *      R.reverse([1]);        //=> [1]\n *      R.reverse([]);         //=> []\n *\n *      R.reverse('abc');      //=> 'cba'\n *      R.reverse('ab');       //=> 'ba'\n *      R.reverse('a');        //=> 'a'\n *      R.reverse('');         //=> ''\n */\nvar reverse = /*#__PURE__*/_curry1(function reverse(list) {\n  return _isString(list) ? list.split('').reverse().join('') : Array.prototype.slice.call(list, 0).reverse();\n});\nexport default reverse;","export default function _isString(x) {\n  return Object.prototype.toString.call(x) === '[object String]';\n}","import _curry1 from './_curry1.js';\nimport _isPlaceholder from './_isPlaceholder.js';\n\n/**\n * Optimized internal two-arity curry function.\n *\n * @private\n * @category Function\n * @param {Function} fn The function to curry.\n * @return {Function} The curried function.\n */\nexport default function _curry2(fn) {\n  return function f2(a, b) {\n    switch (arguments.length) {\n      case 0:\n        return f2;\n      case 1:\n        return _isPlaceholder(a) ? f2 : _curry1(function (_b) {\n          return fn(a, _b);\n        });\n      default:\n        return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {\n          return fn(_a, b);\n        }) : _isPlaceholder(b) ? _curry1(function (_b) {\n          return fn(a, _b);\n        }) : fn(a, b);\n    }\n  };\n}","export default function _arrayFromIterator(iter) {\n  var list = [];\n  var next;\n  while (!(next = iter.next()).done) {\n    list.push(next.value);\n  }\n  return list;\n}","export default function _includesWith(pred, x, list) {\n  var idx = 0;\n  var len = list.length;\n\n  while (idx < len) {\n    if (pred(x, list[idx])) {\n      return true;\n    }\n    idx += 1;\n  }\n  return false;\n}","// Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is\nfunction _objectIs(a, b) {\n  // SameValue algorithm\n  if (a === b) {\n    // Steps 1-5, 7-10\n    // Steps 6.b-6.e: +0 != -0\n    return a !== 0 || 1 / a === 1 / b;\n  } else {\n    // Step 6.a: NaN == NaN\n    return a !== a && b !== b;\n  }\n}\n\nexport default typeof Object.is === 'function' ? Object.is : _objectIs;","import _curry1 from './internal/_curry1.js';\n\n/**\n * Gives a single-word string description of the (native) type of a value,\n * returning such answers as 'Object', 'Number', 'Array', or 'Null'. Does not\n * attempt to distinguish user Object types any further, reporting them all as\n * 'Object'.\n *\n * @func\n * @memberOf R\n * @since v0.8.0\n * @category Type\n * @sig (* -> {*}) -> String\n * @param {*} val The value to test\n * @return {String}\n * @example\n *\n *      R.type({}); //=> \"Object\"\n *      R.type(1); //=> \"Number\"\n *      R.type(false); //=> \"Boolean\"\n *      R.type('s'); //=> \"String\"\n *      R.type(null); //=> \"Null\"\n *      R.type([]); //=> \"Array\"\n *      R.type(/[A-z]/); //=> \"RegExp\"\n *      R.type(() => {}); //=> \"Function\"\n *      R.type(undefined); //=> \"Undefined\"\n */\nvar type = /*#__PURE__*/_curry1(function type(val) {\n  return val === null ? 'Null' : val === undefined ? 'Undefined' : Object.prototype.toString.call(val).slice(8, -1);\n});\nexport default type;","import _arrayFromIterator from './_arrayFromIterator.js';\nimport _includesWith from './_includesWith.js';\nimport _functionName from './_functionName.js';\nimport _has from './_has.js';\nimport _objectIs from './_objectIs.js';\nimport keys from '../keys.js';\nimport type from '../type.js';\n\n/**\n * private _uniqContentEquals function.\n * That function is checking equality of 2 iterator contents with 2 assumptions\n * - iterators lengths are the same\n * - iterators values are unique\n *\n * false-positive result will be returned for comparision of, e.g.\n * - [1,2,3] and [1,2,3,4]\n * - [1,1,1] and [1,2,3]\n * */\n\nfunction _uniqContentEquals(aIterator, bIterator, stackA, stackB) {\n  var a = _arrayFromIterator(aIterator);\n  var b = _arrayFromIterator(bIterator);\n\n  function eq(_a, _b) {\n    return _equals(_a, _b, stackA.slice(), stackB.slice());\n  }\n\n  // if *a* array contains any element that is not included in *b*\n  return !_includesWith(function (b, aItem) {\n    return !_includesWith(eq, aItem, b);\n  }, b, a);\n}\n\nexport default function _equals(a, b, stackA, stackB) {\n  if (_objectIs(a, b)) {\n    return true;\n  }\n\n  var typeA = type(a);\n\n  if (typeA !== type(b)) {\n    return false;\n  }\n\n  if (a == null || b == null) {\n    return false;\n  }\n\n  if (typeof a['fantasy-land/equals'] === 'function' || typeof b['fantasy-land/equals'] === 'function') {\n    return typeof a['fantasy-land/equals'] === 'function' && a['fantasy-land/equals'](b) && typeof b['fantasy-land/equals'] === 'function' && b['fantasy-land/equals'](a);\n  }\n\n  if (typeof a.equals === 'function' || typeof b.equals === 'function') {\n    return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);\n  }\n\n  switch (typeA) {\n    case 'Arguments':\n    case 'Array':\n    case 'Object':\n      if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {\n        return a === b;\n      }\n      break;\n    case 'Boolean':\n    case 'Number':\n    case 'String':\n      if (!(typeof a === typeof b && _objectIs(a.valueOf(), b.valueOf()))) {\n        return false;\n      }\n      break;\n    case 'Date':\n      if (!_objectIs(a.valueOf(), b.valueOf())) {\n        return false;\n      }\n      break;\n    case 'Error':\n      return a.name === b.name && a.message === b.message;\n    case 'RegExp':\n      if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {\n        return false;\n      }\n      break;\n  }\n\n  var idx = stackA.length - 1;\n  while (idx >= 0) {\n    if (stackA[idx] === a) {\n      return stackB[idx] === b;\n    }\n    idx -= 1;\n  }\n\n  switch (typeA) {\n    case 'Map':\n      if (a.size !== b.size) {\n        return false;\n      }\n\n      return _uniqContentEquals(a.entries(), b.entries(), stackA.concat([a]), stackB.concat([b]));\n    case 'Set':\n      if (a.size !== b.size) {\n        return false;\n      }\n\n      return _uniqContentEquals(a.values(), b.values(), stackA.concat([a]), stackB.concat([b]));\n    case 'Arguments':\n    case 'Array':\n    case 'Object':\n    case 'Boolean':\n    case 'Number':\n    case 'String':\n    case 'Date':\n    case 'Error':\n    case 'RegExp':\n    case 'Int8Array':\n    case 'Uint8Array':\n    case 'Uint8ClampedArray':\n    case 'Int16Array':\n    case 'Uint16Array':\n    case 'Int32Array':\n    case 'Uint32Array':\n    case 'Float32Array':\n    case 'Float64Array':\n    case 'ArrayBuffer':\n      break;\n    default:\n      // Values of other types are only equal if identical.\n      return false;\n  }\n\n  var keysA = keys(a);\n  if (keysA.length !== keys(b).length) {\n    return false;\n  }\n\n  var extendedStackA = stackA.concat([a]);\n  var extendedStackB = stackB.concat([b]);\n\n  idx = keysA.length - 1;\n  while (idx >= 0) {\n    var key = keysA[idx];\n    if (!(_has(key, b) && _equals(b[key], a[key], extendedStackA, extendedStackB))) {\n      return false;\n    }\n    idx -= 1;\n  }\n  return true;\n}","export default function _functionName(f) {\n  // String(x => x) evaluates to \"x => x\", so the pattern may not match.\n  var match = String(f).match(/^function (\\w*)/);\n  return match == null ? '' : match[1];\n}","import _curry2 from './internal/_curry2.js';\nimport _equals from './internal/_equals.js';\n\n/**\n * Returns `true` if its arguments are equivalent, `false` otherwise. Handles\n * cyclical data structures.\n *\n * Dispatches symmetrically to the `equals` methods of both arguments, if\n * present.\n *\n * @func\n * @memberOf R\n * @since v0.15.0\n * @category Relation\n * @sig a -> b -> Boolean\n * @param {*} a\n * @param {*} b\n * @return {Boolean}\n * @example\n *\n *      R.equals(1, 1); //=> true\n *      R.equals(1, '1'); //=> false\n *      R.equals([1, 2, 3], [1, 2, 3]); //=> true\n *\n *      const a = {}; a.v = a;\n *      const b = {}; b.v = b;\n *      R.equals(a, b); //=> true\n */\nvar equals = /*#__PURE__*/_curry2(function equals(a, b) {\n  return _equals(a, b, [], []);\n});\nexport default equals;","import _indexOf from './_indexOf.js';\n\nexport default function _includes(a, list) {\n  return _indexOf(list, a, 0) >= 0;\n}","import equals from '../equals.js';\n\nexport default function _indexOf(list, a, idx) {\n  var inf, item;\n  // Array.prototype.indexOf doesn't exist below IE9\n  if (typeof list.indexOf === 'function') {\n    switch (typeof a) {\n      case 'number':\n        if (a === 0) {\n          // manually crawl the list to distinguish between +0 and -0\n          inf = 1 / a;\n          while (idx < list.length) {\n            item = list[idx];\n            if (item === 0 && 1 / item === inf) {\n              return idx;\n            }\n            idx += 1;\n          }\n          return -1;\n        } else if (a !== a) {\n          // NaN\n          while (idx < list.length) {\n            item = list[idx];\n            if (typeof item === 'number' && item !== item) {\n              return idx;\n            }\n            idx += 1;\n          }\n          return -1;\n        }\n        // non-zero numbers can utilise Set\n        return list.indexOf(a, idx);\n\n      // all these types can utilise Set\n      case 'string':\n      case 'boolean':\n      case 'function':\n      case 'undefined':\n        return list.indexOf(a, idx);\n\n      case 'object':\n        if (a === null) {\n          // null can utilise Set\n          return list.indexOf(a, idx);\n        }\n    }\n  }\n  // anything else not covered above, defer to R.equals\n  while (idx < list.length) {\n    if (equals(list[idx], a)) {\n      return idx;\n    }\n    idx += 1;\n  }\n  return -1;\n}","import _includes from './_includes.js';\n\nvar _Set = /*#__PURE__*/function () {\n  function _Set() {\n    /* globals Set */\n    this._nativeSet = typeof Set === 'function' ? new Set() : null;\n    this._items = {};\n  }\n\n  // until we figure out why jsdoc chokes on this\n  // @param item The item to add to the Set\n  // @returns {boolean} true if the item did not exist prior, otherwise false\n  //\n  _Set.prototype.add = function (item) {\n    return !hasOrAdd(item, true, this);\n  };\n\n  //\n  // @param item The item to check for existence in the Set\n  // @returns {boolean} true if the item exists in the Set, otherwise false\n  //\n  _Set.prototype.has = function (item) {\n    return hasOrAdd(item, false, this);\n  };\n\n  //\n  // Combines the logic for checking whether an item is a member of the set and\n  // for adding a new item to the set.\n  //\n  // @param item       The item to check or add to the Set instance.\n  // @param shouldAdd  If true, the item will be added to the set if it doesn't\n  //                   already exist.\n  // @param set        The set instance to check or add to.\n  // @return {boolean} true if the item already existed, otherwise false.\n  //\n  return _Set;\n}();\n\nfunction hasOrAdd(item, shouldAdd, set) {\n  var type = typeof item;\n  var prevSize, newSize;\n  switch (type) {\n    case 'string':\n    case 'number':\n      // distinguish between +0 and -0\n      if (item === 0 && 1 / item === -Infinity) {\n        if (set._items['-0']) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items['-0'] = true;\n          }\n          return false;\n        }\n      }\n      // these types can all utilise the native Set\n      if (set._nativeSet !== null) {\n        if (shouldAdd) {\n          prevSize = set._nativeSet.size;\n          set._nativeSet.add(item);\n          newSize = set._nativeSet.size;\n          return newSize === prevSize;\n        } else {\n          return set._nativeSet.has(item);\n        }\n      } else {\n        if (!(type in set._items)) {\n          if (shouldAdd) {\n            set._items[type] = {};\n            set._items[type][item] = true;\n          }\n          return false;\n        } else if (item in set._items[type]) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items[type][item] = true;\n          }\n          return false;\n        }\n      }\n\n    case 'boolean':\n      // set._items['boolean'] holds a two element array\n      // representing [ falseExists, trueExists ]\n      if (type in set._items) {\n        var bIdx = item ? 1 : 0;\n        if (set._items[type][bIdx]) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items[type][bIdx] = true;\n          }\n          return false;\n        }\n      } else {\n        if (shouldAdd) {\n          set._items[type] = item ? [false, true] : [true, false];\n        }\n        return false;\n      }\n\n    case 'function':\n      // compare functions for reference equality\n      if (set._nativeSet !== null) {\n        if (shouldAdd) {\n          prevSize = set._nativeSet.size;\n          set._nativeSet.add(item);\n          newSize = set._nativeSet.size;\n          return newSize === prevSize;\n        } else {\n          return set._nativeSet.has(item);\n        }\n      } else {\n        if (!(type in set._items)) {\n          if (shouldAdd) {\n            set._items[type] = [item];\n          }\n          return false;\n        }\n        if (!_includes(item, set._items[type])) {\n          if (shouldAdd) {\n            set._items[type].push(item);\n          }\n          return false;\n        }\n        return true;\n      }\n\n    case 'undefined':\n      if (set._items[type]) {\n        return true;\n      } else {\n        if (shouldAdd) {\n          set._items[type] = true;\n        }\n        return false;\n      }\n\n    case 'object':\n      if (item === null) {\n        if (!set._items['null']) {\n          if (shouldAdd) {\n            set._items['null'] = true;\n          }\n          return false;\n        }\n        return true;\n      }\n    /* falls through */\n    default:\n      // reduce the search size of heterogeneous sets by creating buckets\n      // for each type.\n      type = Object.prototype.toString.call(item);\n      if (!(type in set._items)) {\n        if (shouldAdd) {\n          set._items[type] = [item];\n        }\n        return false;\n      }\n      // scan through all previously applied items\n      if (!_includes(item, set._items[type])) {\n        if (shouldAdd) {\n          set._items[type].push(item);\n        }\n        return false;\n      }\n      return true;\n  }\n}\n\n// A simple Set type that honours R.equals semantics\nexport default _Set;","import _curry2 from './internal/_curry2.js';\nimport _Set from './internal/_Set.js';\n\n/**\n * Finds the set (i.e. no duplicates) of all elements in the first list not\n * contained in the second list. Objects and Arrays are compared in terms of\n * value equality, not reference equality.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Relation\n * @sig [*] -> [*] -> [*]\n * @param {Array} list1 The first list.\n * @param {Array} list2 The second list.\n * @return {Array} The elements in `list1` that are not in `list2`.\n * @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith, R.without\n * @example\n *\n *      R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]\n *      R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]\n *      R.difference([{a: 1}, {b: 2}], [{a: 1}, {c: 3}]) //=> [{b: 2}]\n */\nvar difference = /*#__PURE__*/_curry2(function difference(first, second) {\n  var out = [];\n  var idx = 0;\n  var firstLen = first.length;\n  var secondLen = second.length;\n  var toFilterOut = new _Set();\n\n  for (var i = 0; i < secondLen; i += 1) {\n    toFilterOut.add(second[i]);\n  }\n\n  while (idx < firstLen) {\n    if (toFilterOut.add(first[idx])) {\n      out[out.length] = first[idx];\n    }\n    idx += 1;\n  }\n  return out;\n});\nexport default difference;","/** PURE_IMPORTS_START tslib,_AsyncAction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncAction } from './AsyncAction';\nvar AnimationFrameAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnimationFrameAction, _super);\n    function AnimationFrameAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        return _this;\n    }\n    AnimationFrameAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay !== null && delay > 0) {\n            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);\n        }\n        scheduler.actions.push(this);\n        return scheduler.scheduled || (scheduler.scheduled = requestAnimationFrame(function () { return scheduler.flush(null); }));\n    };\n    AnimationFrameAction.prototype.recycleAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n            return _super.prototype.recycleAsyncId.call(this, scheduler, id, delay);\n        }\n        if (scheduler.actions.length === 0) {\n            cancelAnimationFrame(id);\n            scheduler.scheduled = undefined;\n        }\n        return undefined;\n    };\n    return AnimationFrameAction;\n}(AsyncAction));\nexport { AnimationFrameAction };\n//# sourceMappingURL=AnimationFrameAction.js.map\n","/** PURE_IMPORTS_START _AnimationFrameAction,_AnimationFrameScheduler PURE_IMPORTS_END */\nimport { AnimationFrameAction } from './AnimationFrameAction';\nimport { AnimationFrameScheduler } from './AnimationFrameScheduler';\nexport var animationFrame = /*@__PURE__*/ new AnimationFrameScheduler(AnimationFrameAction);\n//# sourceMappingURL=animationFrame.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncScheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncScheduler } from './AsyncScheduler';\nvar AnimationFrameScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnimationFrameScheduler, _super);\n    function AnimationFrameScheduler() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    AnimationFrameScheduler.prototype.flush = function (action) {\n        this.active = true;\n        this.scheduled = undefined;\n        var actions = this.actions;\n        var error;\n        var index = -1;\n        var count = actions.length;\n        action = action || actions.shift();\n        do {\n            if (error = action.execute(action.state, action.delay)) {\n                break;\n            }\n        } while (++index < count && (action = actions.shift()));\n        this.active = false;\n        if (error) {\n            while (++index < count && (action = actions.shift())) {\n                action.unsubscribe();\n            }\n            throw error;\n        }\n    };\n    return AnimationFrameScheduler;\n}(AsyncScheduler));\nexport { AnimationFrameScheduler };\n//# sourceMappingURL=AnimationFrameScheduler.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nexport function finalize(callback) {\n    return function (source) { return source.lift(new FinallyOperator(callback)); };\n}\nvar FinallyOperator = /*@__PURE__*/ (function () {\n    function FinallyOperator(callback) {\n        this.callback = callback;\n    }\n    FinallyOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new FinallySubscriber(subscriber, this.callback));\n    };\n    return FinallyOperator;\n}());\nvar FinallySubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(FinallySubscriber, _super);\n    function FinallySubscriber(destination, callback) {\n        var _this = _super.call(this, destination) || this;\n        _this.add(new Subscription(callback));\n        return _this;\n    }\n    return FinallySubscriber;\n}(Subscriber));\n//# sourceMappingURL=finalize.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set anchor blur\n *\n * @param el - Anchor element\n * @param value - Whether the anchor is blurred\n */\nexport function setAnchorBlur(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"blur\" : \"\")\n}\n\n/**\n * Reset anchor blur\n *\n * @param el - Anchor element\n */\nexport function resetAnchorBlur(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Set anchor active\n *\n * @param el - Anchor element\n * @param value - Whether the anchor is active\n */\nexport function setAnchorActive(\n  el: HTMLElement, value: boolean\n): void {\n  el.classList.toggle(\"md-nav__link--active\", value)\n}\n\n/**\n * Reset anchor active\n *\n * @param el - Anchor element\n */\nexport function resetAnchorActive(\n  el: HTMLElement\n): void {\n  el.classList.remove(\"md-nav__link--active\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set overflow scrolling\n *\n * @param el - Scrollable element\n */\nexport function setOverflowScrolling(\n  el: HTMLElement\n): void {\n  el.style.backgroundColor = \"yellow\" // TODO: debugging\n  el.style.webkitOverflowScrolling = \"touch\"\n}\n\n/**\n * Reset overflow scrolling\n *\n * @param el - Scrollable element\n */\nexport function resetOverflowScrolling(\n  el: HTMLElement\n): void {\n  el.style.backgroundColor = \"\" // TODO: debugging\n  el.style.webkitOverflowScrolling = \"\"\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { JSX as JSXInternal } from \"preact\"\nimport { keys } from \"ramda\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * HTML attributes\n */\ntype Attributes =\n  & JSXInternal.HTMLAttributes\n  & JSXInternal.SVGAttributes\n  & Record<string, any>\n\n/**\n * Child element\n */\ntype Child =\n  | HTMLElement\n  | Text\n  | string\n  | number\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Append a child node to an element\n *\n * @param el - Element\n * @param child - Child node(s)\n */\nfunction appendChild(el: HTMLElement, child: Child | Child[]): void {\n\n  /* Handle primitive types (including raw HTML) */\n  if (typeof child === \"string\" || typeof child === \"number\") {\n    el.innerHTML += child.toString()\n\n  /* Handle nodes */\n  } else if (child instanceof Node) {\n    el.appendChild(child)\n\n  /* Handle nested children */\n  } else if (Array.isArray(child)) {\n    for (const node of child)\n      appendChild(el, node)\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * JSX factory\n *\n * @param tag - HTML tag\n * @param attributes - HTML attributes\n * @param children - Child elements\n *\n * @return Element\n */\nexport function h(\n  tag: string, attributes: Attributes | null, ...children: Child[]\n): HTMLElement {\n  const el = document.createElement(tag)\n\n  /* Set attributes, if any */\n  if (attributes)\n    for (const attr of keys(attributes))\n      if (typeof attributes[attr] !== \"boolean\")\n        el.setAttribute(attr, attributes[attr])\n      else if (attributes[attr])\n        el.setAttribute(attr, \"\")\n\n  /* Append child nodes */\n  for (const child of children)\n    appendChild(el, child)\n\n  /* Return element */\n  return el\n}\n\n/* ----------------------------------------------------------------------------\n * Namespace\n * ------------------------------------------------------------------------- */\n\nexport declare namespace h {\n  namespace JSX {\n    type Element = HTMLElement\n    type IntrinsicElements = JSXInternal.IntrinsicElements\n  }\n}\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport function takeUntil(notifier) {\n    return function (source) { return source.lift(new TakeUntilOperator(notifier)); };\n}\nvar TakeUntilOperator = /*@__PURE__*/ (function () {\n    function TakeUntilOperator(notifier) {\n        this.notifier = notifier;\n    }\n    TakeUntilOperator.prototype.call = function (subscriber, source) {\n        var takeUntilSubscriber = new TakeUntilSubscriber(subscriber);\n        var notifierSubscription = subscribeToResult(takeUntilSubscriber, this.notifier);\n        if (notifierSubscription && !takeUntilSubscriber.seenValue) {\n            takeUntilSubscriber.add(notifierSubscription);\n            return source.subscribe(takeUntilSubscriber);\n        }\n        return takeUntilSubscriber;\n    };\n    return TakeUntilOperator;\n}());\nvar TakeUntilSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(TakeUntilSubscriber, _super);\n    function TakeUntilSubscriber(destination) {\n        var _this = _super.call(this, destination) || this;\n        _this.seenValue = false;\n        return _this;\n    }\n    TakeUntilSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.seenValue = true;\n        this.complete();\n    };\n    TakeUntilSubscriber.prototype.notifyComplete = function () {\n    };\n    return TakeUntilSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=takeUntil.js.map\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport function withLatestFrom() {\n    var args = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        args[_i] = arguments[_i];\n    }\n    return function (source) {\n        var project;\n        if (typeof args[args.length - 1] === 'function') {\n            project = args.pop();\n        }\n        var observables = args;\n        return source.lift(new WithLatestFromOperator(observables, project));\n    };\n}\nvar WithLatestFromOperator = /*@__PURE__*/ (function () {\n    function WithLatestFromOperator(observables, project) {\n        this.observables = observables;\n        this.project = project;\n    }\n    WithLatestFromOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));\n    };\n    return WithLatestFromOperator;\n}());\nvar WithLatestFromSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(WithLatestFromSubscriber, _super);\n    function WithLatestFromSubscriber(destination, observables, project) {\n        var _this = _super.call(this, destination) || this;\n        _this.observables = observables;\n        _this.project = project;\n        _this.toRespond = [];\n        var len = observables.length;\n        _this.values = new Array(len);\n        for (var i = 0; i < len; i++) {\n            _this.toRespond.push(i);\n        }\n        for (var i = 0; i < len; i++) {\n            var observable = observables[i];\n            _this.add(subscribeToResult(_this, observable, observable, i));\n        }\n        return _this;\n    }\n    WithLatestFromSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.values[outerIndex] = innerValue;\n        var toRespond = this.toRespond;\n        if (toRespond.length > 0) {\n            var found = toRespond.indexOf(outerIndex);\n            if (found !== -1) {\n                toRespond.splice(found, 1);\n            }\n        }\n    };\n    WithLatestFromSubscriber.prototype.notifyComplete = function () {\n    };\n    WithLatestFromSubscriber.prototype._next = function (value) {\n        if (this.toRespond.length === 0) {\n            var args = [value].concat(this.values);\n            if (this.project) {\n                this._tryProject(args);\n            }\n            else {\n                this.destination.next(args);\n            }\n        }\n    };\n    WithLatestFromSubscriber.prototype._tryProject = function (args) {\n        var result;\n        try {\n            result = this.project.apply(this, args);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return WithLatestFromSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=withLatestFrom.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { getElement } from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Translations\n */\nlet lang: Record<string, string>\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Translate the given key\n *\n * @param key - Key to be translated\n * @param value - Value to be replaced\n *\n * @return Translation\n */\nexport function translate(key: string, value?: string): string {\n  if (typeof lang === \"undefined\") {\n    const el = getElement(\"#__lang\")!\n    lang = JSON.parse(el.innerText)\n  }\n  if (typeof lang[key] === \"undefined\") {\n    throw new ReferenceError(`Invalid translation: ${key}`)\n  }\n  return typeof value !== \"undefined\"\n    ? lang[key].replace(\"#\", value)\n    : lang[key]\n}\n\n/**\n * Truncate a string after the given number of characters\n *\n * @param value - Value to be truncated\n * @param n - Number of characters\n *\n * @return Truncated value\n */\nexport function truncate(value: string, n: number): string {\n  let i = n\n  if (value.length > i) {\n    while (value[i] !== \" \" && --i > 0); // tslint:disable-line\n    return `${value.substring(0, i)}...`\n  }\n  return value\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  EMPTY,\n  MonoTypeOperatorFunction,\n  Observable,\n  OperatorFunction,\n  combineLatest,\n  of,\n  pipe\n} from \"rxjs\"\nimport {\n  filter,\n  map,\n  switchMap,\n  takeUntil,\n  withLatestFrom\n} from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Toggle switch map with another observable\n *\n * @template T - Source value type\n * @template U - Target value type\n *\n * @param toggle$ - Toggle observable\n * @param project - Projection\n *\n * @return Operator function\n */\nexport function switchMapIf<T, U>(\n  toggle$: Observable<boolean>, project: (value: T) => Observable<U>\n): OperatorFunction<T, U> {\n  const begin$ = toggle$.pipe(filter(value =>  value))\n  const end$   = toggle$.pipe(filter(value => !value))\n  return pipe(\n    switchMap(value => combineLatest([of(value), begin$])),\n    switchMap(([value, active]) => active\n      ? project(value)\n          .pipe(\n            takeUntil(end$)\n          )\n      : EMPTY\n    )\n  )\n}\n\n/**\n * Toggle emission with another observable\n *\n * @template T - Value type\n *\n * @param toggle$ - Toggle observable\n *\n * @return Operator function\n */\nexport function takeIf<T>(\n  toggle$: Observable<boolean>\n): MonoTypeOperatorFunction<T> {\n  return pipe(\n    withLatestFrom(toggle$),\n    filter(([, active]) => active),\n    map(([value]) => value)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { translate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set number of search results\n *\n * @param el - Search result metadata element\n * @param value - Number of results\n */\nexport function setSearchResultMeta(\n  el: HTMLElement, value: number\n): void {\n  switch (value) {\n\n    /* No results */\n    case 0:\n      el.textContent = translate(\"search.result.none\")\n      break\n\n    /* One result */\n    case 1:\n      el.textContent = translate(\"search.result.one\")\n      break\n\n    /* Multiple result */\n    default:\n      el.textContent = translate(\"search.result.other\", value.toString())\n  }\n}\n\n/**\n * Reset number of search results\n *\n * @param el - Search result metadata element\n */\nexport function resetSearchResultMeta(\n  el: HTMLElement\n): void {\n  el.textContent = translate(\"search.result.placeholder\")\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Add an element to the search result list\n *\n * @param el - Search result list element\n * @param child - Search result element\n */\nexport function addToSearchResultList(\n  el: HTMLElement, child: HTMLElement\n): void {\n  el.appendChild(child)\n}\n\n/**\n * Reset search result list\n *\n * @param el - Search result list element\n */\nexport function resetSearchResultList(\n  el: HTMLElement\n): void {\n  el.innerHTML = \"\"\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, of } from \"rxjs\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Header\n */\nexport interface Header {\n  sticky: boolean                      /* Header stickyness */\n  height: number                       /* Header visible height */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch header\n *\n * The header is wrapped in an observable to pave the way for auto-hiding or\n * other dynamic behaviors that may be implemented later on.\n *\n * @param el - Header element\n *\n * @return Header observable\n */\nexport function watchHeader(\n  el: HTMLElement\n): Observable<Header> {\n  const styles = getComputedStyle(el)\n  const sticky = styles.position === \"sticky\"\n  return of({\n    sticky,\n    height: sticky ? el.offsetHeight : 0\n  })\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { OperatorFunction, animationFrameScheduler, pipe } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  observeOn,\n  tap\n} from \"rxjs/operators\"\n\nimport { resetHidden, setHidden } from \"actions\"\n\nimport { Viewport } from \"../../agent\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint hideable from source observable\n *\n * @param el - Hideable element\n * @param offset - Additional offset\n *\n * @return Operator function\n */\nexport function paintHideable(\n  el: HTMLElement, offset: number = 0\n): OperatorFunction<Viewport, boolean> {\n  return pipe(\n    map(({ offset: { y } }) => y >= offset),\n    distinctUntilChanged(),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(value => {\n      setHidden(el, value)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetHidden(el)\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set hidden\n *\n * @param el - Hideable element\n * @param value - Whether the element is hidden\n */\nexport function setHidden(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"hidden\" : \"\")\n}\n\n/**\n * Reset hidden\n *\n * @param el - Hideable element\n */\nexport function resetHidden(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { equals } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  combineLatest,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  observeOn,\n  shareReplay,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetSidebarHeight,\n  resetSidebarLock,\n  setSidebarHeight,\n  setSidebarLock\n} from \"actions\"\n\nimport { Viewport } from \"../../agent\"\nimport { Main } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Sidebar\n */\nexport interface Sidebar {\n  height: number                       /* Sidebar height */\n  lock: boolean                        /* Sidebar lock */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  main$: Observable<Main>              /* Main area observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch sidebar\n *\n * This function returns an observable that computes the visual parameters of\n * the sidebar which depends on the vertical viewport offset, as well as the\n * height of the main area. When the page is scrolled beyond the header, the\n * sidebar is locked and fills the remaining space.\n *\n * @param el - Sidebar element\n * @param options - Options\n *\n * @return Sidebar observable\n */\nexport function watchSidebar(\n  el: HTMLElement, { main$, viewport$ }: Options\n): Observable<Sidebar> {\n\n  /* Adjust for internal main area offset */\n  const adjust = parseFloat(\n    getComputedStyle(el.parentElement!)\n      .getPropertyValue(\"padding-top\")\n  )\n\n  /* Compute the sidebar's available height */\n  const height$ = combineLatest([viewport$, main$])\n    .pipe(\n      map(([{ offset: { y } }, { offset, height }]) => {\n        return height - adjust + Math.min(adjust, Math.max(0, y - offset))\n      })\n    )\n\n  /* Compute whether the sidebar should be locked */\n  const lock$ = combineLatest([viewport$, main$])\n    .pipe(\n      map(([{ offset: { y } }, { offset }]) => y >= offset + adjust)\n    )\n\n  /* Combine into single hot observable */\n  return combineLatest([height$, lock$])\n    .pipe(\n      map(([height, lock]) => ({ height, lock })),\n      distinctUntilChanged<Sidebar>(equals),\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint sidebar from source observable\n *\n * @param el - Sidebar element\n *\n * @return Operator function\n */\nexport function paintSidebar(\n  el: HTMLElement\n): MonoTypeOperatorFunction<Sidebar> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ height, lock }) => {\n      setSidebarHeight(el, height)\n      setSidebarLock(el, lock)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetSidebarHeight(el)\n      resetSidebarLock(el)\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set sidebar height\n *\n * @param el - Sidebar element\n * @param value - Sidebar height\n */\nexport function setSidebarHeight(\n  el: HTMLElement, value: number\n): void {\n  el.style.height = `${value}px`\n}\n\n/**\n * Reset sidebar height\n *\n * @param el - Sidebar element\n */\nexport function resetSidebarHeight(\n  el: HTMLElement\n): void {\n  el.style.height = \"\"\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Set sidebar lock\n *\n * @param el - Sidebar element\n * @param value - Whether the sidebar is locked\n */\nexport function setSidebarLock(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"lock\" : \"\")\n}\n\n/**\n * Reset sidebar lock\n *\n * @param el - Sidebar element\n */\nexport function resetSidebarLock(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/**\n * Tests whether or not an object is an array.\n *\n * @private\n * @param {*} val The object to test.\n * @return {Boolean} `true` if `val` is an array, `false` otherwise.\n * @example\n *\n *      _isArray([]); //=> true\n *      _isArray(null); //=> false\n *      _isArray({}); //=> false\n */\nexport default Array.isArray || function _isArray(val) {\n  return val != null && val.length >= 0 && Object.prototype.toString.call(val) === '[object Array]';\n};","export default function _isTransformer(obj) {\n  return obj != null && typeof obj['@@transducer/step'] === 'function';\n}","import _isArray from './_isArray.js';\nimport _isTransformer from './_isTransformer.js';\n\n/**\n * Returns a function that dispatches with different strategies based on the\n * object in list position (last argument). If it is an array, executes [fn].\n * Otherwise, if it has a function with one of the given method names, it will\n * execute that function (functor case). Otherwise, if it is a transformer,\n * uses transducer [xf] to return a new transformer (transducer case).\n * Otherwise, it will default to executing [fn].\n *\n * @private\n * @param {Array} methodNames properties to check for a custom implementation\n * @param {Function} xf transducer to initialize if object is transformer\n * @param {Function} fn default ramda implementation\n * @return {Function} A function that dispatches on object in list position\n */\nexport default function _dispatchable(methodNames, xf, fn) {\n  return function () {\n    if (arguments.length === 0) {\n      return fn();\n    }\n    var args = Array.prototype.slice.call(arguments, 0);\n    var obj = args.pop();\n    if (!_isArray(obj)) {\n      var idx = 0;\n      while (idx < methodNames.length) {\n        if (typeof obj[methodNames[idx]] === 'function') {\n          return obj[methodNames[idx]].apply(obj, args);\n        }\n        idx += 1;\n      }\n      if (_isTransformer(obj)) {\n        var transducer = xf.apply(null, args);\n        return transducer(obj);\n      }\n    }\n    return fn.apply(this, arguments);\n  };\n}","export default {\n  init: function () {\n    return this.xf['@@transducer/init']();\n  },\n  result: function (result) {\n    return this.xf['@@transducer/result'](result);\n  }\n};","import _curry2 from './_curry2.js';\nimport _xfBase from './_xfBase.js';\n\nvar XFindLast = /*#__PURE__*/function () {\n  function XFindLast(f, xf) {\n    this.xf = xf;\n    this.f = f;\n  }\n  XFindLast.prototype['@@transducer/init'] = _xfBase.init;\n  XFindLast.prototype['@@transducer/result'] = function (result) {\n    return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.last));\n  };\n  XFindLast.prototype['@@transducer/step'] = function (result, input) {\n    if (this.f(input)) {\n      this.last = input;\n    }\n    return result;\n  };\n\n  return XFindLast;\n}();\n\nvar _xfindLast = /*#__PURE__*/_curry2(function _xfindLast(f, xf) {\n  return new XFindLast(f, xf);\n});\nexport default _xfindLast;","import _curry2 from './internal/_curry2.js';\nimport _dispatchable from './internal/_dispatchable.js';\nimport _xfindLast from './internal/_xfindLast.js';\n\n/**\n * Returns the last element of the list which matches the predicate, or\n * `undefined` if no element matches.\n *\n * Acts as a transducer if a transformer is given in list position.\n *\n * @func\n * @memberOf R\n * @since v0.1.1\n * @category List\n * @sig (a -> Boolean) -> [a] -> a | undefined\n * @param {Function} fn The predicate function used to determine if the element is the\n * desired one.\n * @param {Array} list The array to consider.\n * @return {Object} The element found, or `undefined`.\n * @see R.transduce\n * @example\n *\n *      const xs = [{a: 1, b: 0}, {a:1, b: 1}];\n *      R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}\n *      R.findLast(R.propEq('a', 4))(xs); //=> undefined\n */\nvar findLast = /*#__PURE__*/_curry2( /*#__PURE__*/_dispatchable([], _xfindLast, function findLast(fn, list) {\n  var idx = list.length - 1;\n  while (idx >= 0) {\n    if (fn(list[idx])) {\n      return list[idx];\n    }\n    idx -= 1;\n  }\n}));\nexport default findLast;","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest, fromEvent } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  map,\n  shareReplay,\n  startWith\n} from \"rxjs/operators\"\n\nimport { watchElementFocus } from \"../../agent\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search query\n */\nexport interface SearchQuery {\n  value: string                        /* Query value */\n  focus: boolean                       /* Query focus */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  transform?(value: string): string    /* Transformation function */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Default transformation function\n *\n * Rogue control characters are filtered before handing the query to the\n * search index, as lunr will throw otherwise.\n *\n * @param value - Query value\n *\n * @return Transformed query value\n */\nfunction defaultTransform(value: string): string {\n  return value\n    .replace(/(?:^|\\s+)[*+-:^~]+(?=\\s+|$)/g, \"\")\n    .trim()\n    .replace(/\\s+|\\b$/g, \"* \")\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch search query\n *\n * @param el - Search query element\n * @param options - Options\n *\n * @return Search query observable\n */\nexport function watchSearchQuery(\n  el: HTMLInputElement, { transform = defaultTransform }: Options = {}\n): Observable<SearchQuery> {\n\n  /* Intercept keyboard events */\n  const value$ = fromEvent(el, \"keyup\")\n    .pipe(\n      map(() => transform(el.value)),\n      startWith(el.value),\n      distinctUntilChanged()\n    )\n\n  /* Intercept focus events */\n  const focus$ = watchElementFocus(el)\n\n  /* Combine into a single hot observable */\n  return combineLatest([value$, focus$])\n    .pipe(\n      map(([value, focus]) => ({ value, focus })),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent, merge } from \"rxjs\"\nimport { mapTo, shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch element focus\n *\n * @param el - Element\n *\n * @return Element focus observable\n */\nexport function watchElementFocus(\n  el: HTMLElement\n): Observable<boolean> {\n  const focus$ = fromEvent(el, \"focus\")\n  const blur$  = fromEvent(el, \"blur\")\n\n  /* Map events to boolean state */\n  return merge(\n    focus$.pipe(mapTo(true)),\n    blur$.pipe(mapTo(false))\n  )\n    .pipe(\n      startWith(el === document.activeElement),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { mapTo } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch search reset\n *\n * @param el - Search reset element\n *\n * @return Search reset observable\n */\nexport function watchSearchReset(\n  el: HTMLElement\n): Observable<void> {\n  return fromEvent(el, \"click\")\n    .pipe(\n      mapTo(undefined)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h, translate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  container: \"md-clipboard md-icon\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render clipboard\n *\n * @param id - Unique identifier\n *\n * @return Element\n */\nexport function renderClipboard(\n  id: string\n): HTMLElement {\n  return (\n    <button\n      class={css.container}\n      title={translate(\"clipboard.copy\")}\n      data-clipboard-target={`#${id} code`}\n    >&#xE14D;</button>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchResult } from \"modules\"\nimport { h, truncate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  item:    \"md-search-result__item\",\n  link:    \"md-search-result__link\",\n  article: \"md-search-result__article md-search-result__article--document\",\n  section: \"md-search-result__article\",\n  title:   \"md-search-result__title\",\n  teaser:  \"md-search-result__teaser\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render a search result\n *\n * @param result - Search result\n *\n * @return Element\n */\nexport function renderSearchResult(\n  { article, sections }: SearchResult\n): HTMLElement {\n  const children = [article, ...sections].map(document => {\n    const { location, title, text } = document\n    return (\n      <a href={location} class={css.link} tabIndex={-1}>\n        <article class={\"parent\" in document ? css.section : css.article}>\n          <h1 class={css.title}>{title}</h1>\n          {text.length\n            ? <p class={css.teaser}>{truncate(text, 320)}</p>\n            : undefined\n          }\n        </article>\n      </a>\n    )\n  })\n  return (\n    <li class={css.item}>\n      {...children}\n    </li>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  facts: \"md-source__facts\",\n  fact:  \"md-source__fact\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render source facts\n *\n * @param facts - Source facts\n *\n * @return Element\n */\nexport function renderSource(\n  facts: any // TODO: add typings\n): HTMLElement {\n  return (\n    <ul class={css.facts}>\n      {facts.map((fact: any) => <li class={css.fact}>{fact}</li>)}\n    </ul>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  wrapper: \"md-typeset__scrollwrap\",\n  table:   \"md-typeset__table\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render a table wrapper\n *\n * @param table - Table element\n *\n * @return Element\n */\nexport function renderTable(\n  table: HTMLTableElement\n): HTMLElement {\n  return (\n    <div class={css.wrapper}>\n      <div class={css.table}>\n        {table}\n      </div>\n    </div>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  pipe\n} from \"rxjs\"\nimport {\n  finalize,\n  map,\n  mapTo,\n  observeOn,\n  scan,\n  switchMap,\n  withLatestFrom\n} from \"rxjs/operators\"\n\nimport {\n  addToSearchResultList,\n  resetSearchResultList,\n  resetSearchResultMeta,\n  setSearchResultMeta\n} from \"actions\"\nimport { SearchResult } from \"modules\"\nimport { renderSearchResult } from \"templates\"\n\nimport { getElement } from \"../../agent\"\nimport { SearchQuery } from \"../query\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  query$: Observable<SearchQuery>     /* Search query observable */\n  fetch$: Observable<boolean>         /* Search trigger observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint search results from source observable\n *\n * @param el - Search result element\n * @param options - Options\n *\n * @return Operator function\n */\nexport function paintSearchResult(\n  el: HTMLElement, { query$, fetch$ }: Options\n): MonoTypeOperatorFunction<SearchResult[]> {\n  const list = getElement(\".md-search-result__list\", el)!\n  const meta = getElement(\".md-search-result__meta\", el)!\n  return pipe(\n\n    /* Paint search result metadata */\n    withLatestFrom(query$),\n    map(([result, query]) => {\n      if (query.value) {\n        setSearchResultMeta(meta, result.length)\n      } else {\n        resetSearchResultMeta(meta)\n      }\n      return result\n    }),\n\n    /* Paint search result list */\n    switchMap(result => fetch$\n      .pipe(\n\n        /* Defer repaint to next animation frame */\n        observeOn(animationFrameScheduler),\n        scan(index => {\n          const container = el.parentElement!\n          while (index < result.length) {\n            addToSearchResultList(list, renderSearchResult(result[index++]))\n            if (container.scrollHeight - container.offsetHeight > 16)\n              break\n          }\n          return index\n        }, 0),\n\n        /* Re-map to search result */\n        mapTo(result),\n\n        /* Reset on complete or error */\n        finalize(() => {\n          resetSearchResultList(list)\n        })\n      )\n    )\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { map, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set toggle\n *\n * Simulating a click event seems to be the most cross-browser compatible way\n * of changing the value while also emitting a `change` event. Before, Material\n * used `CustomEvent` to programmatically change the value of a toggle, but this\n * is a much simpler and cleaner solution.\n *\n * @param el - Toggle element\n * @param value - Toggle value\n */\nexport function setToggle(\n  el: HTMLInputElement, value: boolean\n): void {\n  if (el.checked !== value)\n    el.click()\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch toggle\n *\n * @param el - Toggle element\n *\n * @return Toggle observable\n */\nexport function watchToggle(\n  el: HTMLInputElement\n): Observable<boolean> {\n  return fromEvent(el, \"change\")\n    .pipe(\n      map(() => el.checked),\n      startWith(el.checked)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport { map, shareReplay, switchMap } from \"rxjs/operators\"\n\nimport {\n  Header,\n  Viewport,\n  paintHideable,\n  watchViewportFrom\n} from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Hero state\n */\nexport interface HeroState {\n  hidden: boolean                      /* Whether the hero is hidden */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>     /* Header observable */\n  viewport$: Observable<Viewport>\n  screen$: Observable<boolean>         /* Media screen observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch hero\n *\n * @param el - Hero element\n * @param agent - Agent\n * @param options - Options\n *\n * @return Hero state\n */\nexport function watchHero(\n  el: HTMLElement, options: Options\n): Observable<HeroState> {\n\n  /* Watch and paint visibility */\n  const hidden$ = watchViewportFrom(el, options)\n    .pipe(\n      paintHideable(el, 20)\n    )\n\n  /* Combine into a single hot observable */\n  return hidden$\n    .pipe(\n      map(hidden => ({ hidden }))\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount hero from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountHero(\n  options: Options\n): OperatorFunction<HTMLElement, HeroState> {\n  return pipe(\n    switchMap(el => watchHero(el, options)),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport {\n  Header,\n  Viewport,\n  paintHideable,\n  watchViewportFrom\n} from \"observables\"\nimport { switchMapIf } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Tabs state\n */\nexport interface TabsState {\n  hidden: boolean                      /* Whether the tabs are hidden */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>     /* Header state observable */\n  viewport$: Observable<Viewport>\n  screen$: Observable<boolean>         /* Media screen observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch tabs\n *\n * This function returns an observable that computes the visual parameters of\n * the tabs, currently only denoting whether the tabs are hidden or not.\n *\n * @param el - Tabs element\n * @param options - Options\n *\n * @return Tabs state\n */\nexport function watchTabs(\n  el: HTMLElement, options: Options\n): Observable<TabsState> {\n\n  /* Watch and paint visibility */\n  const hidden$ = watchViewportFrom(el, options)\n    .pipe(\n      paintHideable(el, 8)\n    )\n\n  /* Combine into a single hot observable */\n  return hidden$\n    .pipe(\n      map(hidden => ({ hidden }))\n    )\n}\n// TODO: generalize into watchHideable !!! or mountHideable...\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount tabs from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountTabs(\n  options: Options\n): OperatorFunction<HTMLElement, TabsState> {\n  return pipe(\n    switchMapIf(options.screen$, el => watchTabs(el, options)),\n    shareReplay(1)\n  )\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Packer message type\n */\nexport const enum PackerMessageType {\n  STRING,                              /* String data */\n  BINARY                               /* Packed data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing an unpacked string\n */\nexport interface PackerStringMessage {\n  type: PackerMessageType.STRING       /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing a packed string\n */\nexport interface PackerBinaryMessage {\n  type: PackerMessageType.BINARY       /* Message type */\n  data: string                         /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the packer worker\n */\nexport type PackerMessage =\n  | PackerStringMessage\n  | PackerBinaryMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for packer binary messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerBinaryMessage(\n  message: PackerMessage\n): message is PackerBinaryMessage {\n  return message.type === PackerMessageType.BINARY\n}\n\n/**\n * Type guard for packer string messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerStringMessage(\n  message: PackerMessage\n): message is PackerStringMessage {\n  return message.type === PackerMessageType.STRING\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndexOptions, SearchResult } from \"modules\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search message type\n */\nexport const enum SearchMessageType {\n  SETUP,                               /* Search index setup */\n  DUMP,                                /* Search index dump */\n  QUERY,                               /* Search query */\n  RESULT                               /* Search results */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing the data necessary to setup the search index\n */\nexport interface SearchSetupMessage {\n  type: SearchMessageType.SETUP        /* Message type */\n  data: SearchIndexOptions             /* Message data */\n}\n\n/**\n * A message containing the a dump of the search index\n */\nexport interface SearchDumpMessage {\n  type: SearchMessageType.DUMP        /* Message type */\n  data: string                        /* Message data */\n}\n\n/**\n * A message containing a search query\n */\nexport interface SearchQueryMessage {\n  type: SearchMessageType.QUERY        /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing results for a search query\n */\nexport interface SearchResultMessage {\n  type: SearchMessageType.RESULT       /* Message type */\n  data: SearchResult[]                 /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the search worker\n */\nexport type SearchMessage =\n  | SearchSetupMessage\n  | SearchDumpMessage\n  | SearchQueryMessage\n  | SearchResultMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for search setup messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchSetupMessage(\n  message: SearchMessage\n): message is SearchSetupMessage {\n  return message.type === SearchMessageType.SETUP\n}\n\n/**\n * Type guard for search dump messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchDumpMessage(\n  message: SearchMessage\n): message is SearchDumpMessage {\n  return message.type === SearchMessageType.DUMP\n}\n\n/**\n * Type guard for search query messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchQueryMessage(\n  message: SearchMessage\n): message is SearchQueryMessage {\n  return message.type === SearchMessageType.QUERY\n}\n\n/**\n * Type guard for search result messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchResultMessage(\n  message: SearchMessage\n): message is SearchResultMessage {\n  return message.type === SearchMessageType.RESULT\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, combineLatest, pipe } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport {\n  AnchorList,\n  Header,\n  Main,\n  Sidebar,\n  Viewport,\n  getElements,\n  paintAnchorList,\n  paintSidebar,\n  watchAnchorList,\n  watchSidebar\n} from \"observables\"\nimport { switchMapIf } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Table of contents state\n */\nexport interface TableOfContentsState {\n  sidebar: Sidebar                     /* Sidebar state */\n  anchors: AnchorList                  /* Anchor list */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  main$: Observable<Main>              /* Main area observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n  tablet$: Observable<boolean>         /* Media tablet observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch table of contents\n *\n * @param el - Table of contents element\n * @param agent - Agent\n * @param options - Options\n *\n * @return Table of contents state observable\n */\nexport function watchTableOfContents(\n  el: HTMLElement, { header$, main$, viewport$ }: Options\n): Observable<TableOfContentsState> {\n\n  /* Watch and paint sidebar */\n  const sidebar$ = watchSidebar(el, { main$, viewport$ })\n    .pipe(\n      paintSidebar(el)\n    )\n\n  /* Watch and paint anchor list (scroll spy) */\n  const els = getElements<HTMLAnchorElement>(\".md-nav__link\", el)\n  const anchors$ = watchAnchorList(els, { header$, viewport$ })\n    .pipe(\n      paintAnchorList(els)\n    )\n\n  /* Combine into a single hot observable */\n  return combineLatest([sidebar$, anchors$])\n    .pipe(\n      map(([sidebar, anchors]) => ({ sidebar, anchors }))\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount table of contents from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountTableOfContents(\n  options: Options\n): OperatorFunction<HTMLElement, TableOfContentsState> {\n  return pipe(\n    switchMapIf(options.tablet$, el => watchTableOfContents(el, options)),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { difference, reverse } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  combineLatest,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  distinctUntilKeyChanged,\n  finalize,\n  map,\n  observeOn,\n  scan,\n  shareReplay,\n  switchMap,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetAnchorActive,\n  resetAnchorBlur,\n  setAnchorActive,\n  setAnchorBlur\n} from \"actions\"\n\nimport { Viewport, getElement } from \"../agent\"\nimport { Header } from \"../header\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Anchor list\n */\nexport interface AnchorList {\n  prev: HTMLAnchorElement[][]          /* Anchors (previous) */\n  next: HTMLAnchorElement[][]          /* Anchors (next) */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch anchor list\n *\n * This is effectively a scroll-spy implementation which will account for the\n * fixed header and automatically re-calculate anchor offsets when the viewport\n * is resized. The returned observable will only emit if the anchor list needs\n * to be repainted.\n *\n * This implementation tracks an anchor element's entire path starting from its\n * level up to the top-most anchor element, e.g. `[h3, h2, h1]`. Although the\n * Material theme currently doesn't make use of this information, it enables\n * the styling of the entire hierarchy through customization.\n *\n * Note that the current anchor is the last item of the `prev` anchor list.\n *\n * @param els - Anchor elements\n * @param options - Options\n *\n * @return Anchor list observable\n */\nexport function watchAnchorList(\n  els: HTMLAnchorElement[], { header$, viewport$ }: Options\n): Observable<AnchorList> {\n  const table = new Map<HTMLAnchorElement, HTMLElement>()\n  for (const el of els) {\n    const id = decodeURIComponent(el.hash.substring(1))\n    const target = getElement(`[id=\"${id}\"]`)\n    if (typeof target !== \"undefined\")\n      table.set(el, target)\n  }\n\n  /* Compute necessary adjustment for header */\n  const adjust$ = header$\n    .pipe(\n      map(header => 18 + header.height)\n    )\n\n  /* Compute partition of previous and next anchors */\n  const partition$ = viewport$\n    .pipe(\n      distinctUntilKeyChanged(\"size\"),\n\n      /* Build index to map anchor paths to vertical offsets */\n      map(() => {\n        let path: HTMLAnchorElement[] = []\n        return [...table].reduce((index, [anchor, target]) => {\n          while (path.length) {\n            const last = table.get(path[path.length - 1])!\n            if (last.tagName >= target.tagName) {\n              path.pop()\n            } else {\n              break\n            }\n          }\n          return index.set(\n            reverse(path = [...path, anchor]),\n            target.offsetTop\n          )\n        }, new Map<HTMLAnchorElement[], number>())\n      }),\n\n      /* Re-compute partition when viewport offset changes */\n      switchMap(index => combineLatest(viewport$, adjust$)\n        .pipe(\n          scan(([prev, next], [{ offset: { y } }, adjust]) => {\n\n            /* Look forward */\n            while (next.length) {\n              const [, offset] = next[0]\n              if (offset - adjust < y) {\n                prev = [...prev, next.shift()!]\n              } else {\n                break\n              }\n            }\n\n            /* Look backward */\n            while (prev.length) {\n              const [, offset] = prev[prev.length - 1]\n              if (offset - adjust >= y) {\n                next = [prev.pop()!, ...next]\n              } else {\n                break\n              }\n            }\n\n            /* Return partition */\n            return [prev, next]\n          }, [[], [...index]]),\n          distinctUntilChanged((a, b) => {\n            return a[0] === b[0]\n                && a[1] === b[1]\n          })\n        )\n      )\n    )\n\n  /* Compute anchor list migrations */\n  const migration$ = partition$\n    .pipe(\n      map(([prev, next]) => ({\n        prev: prev.map(([path]) => path),\n        next: next.map(([path]) => path)\n      })),\n\n      /* Extract anchor list migrations */\n      scan<AnchorList>((a, b) => {\n        const begin = Math.max(0, Math.min(b.prev.length, a.prev.length) - 1)\n        const end   = Math.max(b.prev.length, a.prev.length)\n        return {\n          prev: b.prev.slice(begin, end + 1),\n          next: difference(b.next, a.next)\n        }\n      }, { prev: [], next: [] })\n    )\n\n  /* Return anchor list migrations as hot observable */\n  return migration$\n    .pipe(\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint anchor list from source observable\n *\n * @param els - Anchor elements\n *\n * @return Operator function\n */\nexport function paintAnchorList(\n  els: HTMLAnchorElement[]\n): MonoTypeOperatorFunction<AnchorList> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ prev, next }) => {\n\n      /* Look forward */\n      for (const [el] of next) {\n        resetAnchorActive(el)\n        resetAnchorBlur(el)\n      }\n\n      /* Look backward */\n      for (const [index, [el]] of prev.entries()) {\n        setAnchorActive(el, index === prev.length - 1)\n        setAnchorBlur(el, true)\n      }\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      for (const el of els) {\n        resetAnchorActive(el)\n        resetAnchorBlur(el)\n      }\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Repo, User } from \"github-types\"\nimport { NEVER, Observable } from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport { filter, map, pluck, shareReplay } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Round a number\n *\n * TODO: document\n */\nfunction round(value: number) {\n  return value > 999\n    ? `${(value / 1000).toFixed(1)}k`\n    : `${(value)}`\n}\n\n/**\n * TODO: document\n */\nexport function fetchGitHubStats(\n  user: string\n): Observable<User>\nexport function fetchGitHubStats(\n  user: string, repo: string\n): Observable<Repo>\nexport function fetchGitHubStats(\n  user: string, repo?: string\n): Observable<User | Repo> {\n  const endpoint = typeof repo !== \"undefined\"\n    ? `repos/${user}/${repo}`\n    : `users/${user}`\n  return ajax({\n    url: `https://api.github.com/${endpoint}`,\n    responseType: \"json\"\n  })\n    .pipe(\n      filter(({ status }) => status === 200),\n      pluck(\"response\"),\n      shareReplay(1)\n    )\n}\n\n// TODO: GitLab API:\n// https://docs.gitlab.com/ee/api/projects.html#get-single-project\n// curl \"https://gitlab.com/api/v4/projects/johannes-z%2Fmkdocs-material\"\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Get repository information\n *\n * TODO: document\n */\nexport function getRepository(user: string, repo: string): Observable<string[]> {\n  return fetchGitHubStats(user, repo)\n    .pipe(\n      map(({ stargazers_count, forks_count }) => ([\n        `${round(stargazers_count || 0)} Stars`,\n        `${round(forks_count || 0)} Forks`\n      ]))\n    )\n}\n\n/**\n * Get user/organization information\n *\n * TODO: document\n */\nexport function getUser(user: string): Observable<string[]> {\n  return fetchGitHubStats(user)\n    .pipe(\n      map(({ public_repos }) => ([\n        `${round(public_repos || 0)} Repositories`\n      ]))\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, of, pipe } from \"rxjs\"\nimport { map, shareReplay, switchMap } from \"rxjs/operators\"\n\nimport {\n  Main,\n  NavigationLayer,\n  Sidebar,\n  Viewport,\n  getElements,\n  paintNavigationLayer,\n  paintSidebar,\n  watchNavigationLayer,\n  watchSidebar\n} from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Navigation for breakpoint below screen\n */\nexport interface NavigationBelowScreen {\n  layer: NavigationLayer               /* Navigation layer */\n}\n\n/**\n * Navigation for breakpoint above screen\n */\nexport interface NavigationAboveScreen {\n  sidebar: Sidebar                     /* Navigation sidebar */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Navigation\n */\nexport type Navigation =\n  | NavigationBelowScreen\n  | NavigationAboveScreen\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  main$: Observable<Main>              /* Main area observable */\n  viewport$: Observable<Viewport>      /* Viewport offset observable */\n  screen$: Observable<boolean>         /* Screen media observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount navigation below screen from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nfunction mountNavigationBelowScreen(\n  _options: Options\n): OperatorFunction<HTMLElement, NavigationBelowScreen> {\n  return pipe(\n    map(el => getElements(\"nav\", el)),\n    switchMap(els => watchNavigationLayer(els)\n      .pipe(\n        paintNavigationLayer(els),\n        map(layer => ({ layer }))\n      )\n    )\n  )\n}\n\n/**\n * Mount navigation above screen from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nfunction mountNavigationAboveScreen(\n  options: Options\n): OperatorFunction<HTMLElement, NavigationAboveScreen> {\n  return pipe(\n    switchMap(el => watchSidebar(el, options)\n      .pipe(\n        paintSidebar(el),\n        map(sidebar => ({ sidebar }))\n      )\n    )\n  )\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount navigation from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountNavigation(\n  options: Options\n): OperatorFunction<HTMLElement, Navigation> {\n  return pipe(\n    switchMap(el => options.screen$\n      .pipe(\n        switchMap(screen => screen\n          ? of(el).pipe(mountNavigationAboveScreen(options))\n          : of(el).pipe(mountNavigationBelowScreen(options))\n        )\n      )\n    ),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { findLast } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  fromEvent,\n  merge,\n  pipe\n} from \"rxjs\"\nimport {\n  delay,\n  finalize,\n  map,\n  observeOn,\n  scan,\n  shareReplay,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetOverflowScrolling,\n  setOverflowScrolling\n} from \"actions\"\n\nimport { getElement } from \"../../agent\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Navigation layer\n */\nexport interface NavigationLayer {\n  prev?: HTMLElement                   /* Layer (previous) */\n  next: HTMLElement                    /* Layer (next) */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch navigation layer\n *\n * On iOS we want to add `-webkit-overflow-scrolling: touch` for the menus\n * contained in the drawer, but as the navigational layers are nested, we can\n * only add it to the navigation layer or extremely weird cropping will occur.\n * This implementation keeps track of the previous and current layer.\n *\n * @param els - Navigation elements\n *\n * @return Navigation layer observable\n */\nexport function watchNavigationLayer(\n  els: HTMLElement[]\n): Observable<NavigationLayer> {\n  const table = new Map<HTMLInputElement, HTMLElement>()\n  for (const el of els) {\n    const label = getElement<HTMLLabelElement>(\"label\", el)\n    if (typeof label !== \"undefined\") {\n      const input = getElement<HTMLInputElement>(`#${label.htmlFor}`)!\n      table.set(input, el)\n    }\n  }\n\n  /* Determine active layer */\n  const layer$ = merge(\n    ...[...table.keys()].map(input => fromEvent(input, \"change\"))\n  )\n    .pipe(\n      map(() => getElement(\".md-nav__list\", table.get(\n        findLast(({ checked }) => checked, [...table.keys()])!\n      ))!)\n    )\n\n  /* Return previous and next layer */\n  return layer$\n    .pipe(\n      map(next => ({ next })),\n      scan(({ next: prev }, { next }) => ({ prev, next })),\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint navigation layer from source observable\n *\n * @param els - Navigation elements\n *\n * @return Operator function\n */\nexport function paintNavigationLayer(\n  els: HTMLElement[]\n): MonoTypeOperatorFunction<NavigationLayer> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ prev }) => {\n      if (prev)\n        resetOverflowScrolling(prev)\n    }),\n\n    /* Wait until transition has finished */\n    delay(250),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ next }) => {\n      setOverflowScrolling(next)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      for (const el of els)\n        resetOverflowScrolling(\n          getElement(\".md-nav__list\", el)!\n        )\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { identity } from \"ramda\"\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  filter,\n  map,\n  shareReplay,\n  switchMap\n} from \"rxjs/operators\"\n\nimport { SearchResult } from \"modules\"\nimport {\n  SearchQuery,\n  Viewport,\n  paintSearchResult,\n  watchElementOffset\n} from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  query$: Observable<SearchQuery>      /* Search query observable */\n  result$: Observable<SearchResult[]>  /* Search result observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount search result from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountSearchResult(\n  { query$, result$, viewport$ }: Options\n): OperatorFunction<HTMLElement, SearchResult[]> {\n  return pipe(\n    switchMap(el => {\n      const container = el.parentElement!\n\n      /* Compute whether there are more search results to fetch */\n      const fetch$ = watchElementOffset(container, { viewport$ })\n        .pipe(\n          map(({ y }) => {\n            return y >= container.scrollHeight - container.offsetHeight - 16\n          }),\n          distinctUntilChanged(),\n          filter(identity)\n        )\n\n      /* Paint search results */\n      return result$\n        .pipe(\n          paintSearchResult(el, { query$, fetch$ })\n        )\n    }),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n// TODO: remove this after we finished refactoring\n// tslint:disable\n\nimport \"../stylesheets/app.scss\"\nimport \"../stylesheets/app-palette.scss\"\n\nimport * as Clipboard from \"clipboard\"\nimport { identity, values } from \"ramda\"\nimport {\n  EMPTY,\n  Observable,\n  merge,\n  of,\n  fromEvent,\n  OperatorFunction,\n  pipe\n} from \"rxjs\"\nimport {\n  delay,\n  filter,\n  map,\n  pluck,\n  switchMap,\n  switchMapTo,\n  tap,\n  distinctUntilKeyChanged,\n  shareReplay\n} from \"rxjs/operators\"\n\nimport {\n  Component,\n  paintHeaderShadow,\n  mountHero,\n  mountTableOfContents,\n  mountTabs,\n  switchComponent,\n  watchComponentMap,\n} from \"./components\"\nimport {\n  watchHeader,\n  watchSearchQuery,\n  watchSearchReset,\n  getElement,\n  watchToggle,\n  setToggle,\n  getElements,\n  watchMedia,\n  watchDocument,\n  watchLocationHash,\n  watchMain,\n  watchViewport,\n  watchKeyboard\n} from \"./observables\"\nimport {\n  isSearchResultMessage,\n  setupSearchWorker\n} from \"./workers\"\nimport { renderSource } from \"templates\"\nimport { not, takeIf } from \"utilities\"\nimport { renderClipboard } from \"templates/clipboard\"\nimport { fetchGitHubStats } from \"modules/source/github\"\nimport { mountNavigation } from \"components2/navigation\"\nimport { mountSearchResult } from \"components2/search\"\nimport { renderTable } from \"templates/table\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Configuration\n */\nexport interface Config {\n  base: string                         /* Base URL */\n  worker: {\n    search: string                     /* Search worker URL */\n    packer: string                     /* Packer worker URL */\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * TODO: where do we put this stuff?\n * ------------------------------------------------------------------------- */\n\ndocument.documentElement.classList.remove(\"no-js\")\ndocument.documentElement.classList.add(\"js\")\n\n/* Test for iOS */\nif (navigator.userAgent.match(/(iPad|iPhone|iPod)/g))\n  document.documentElement.classList.add(\"ios\")\n\nconst names: Component[] = [\n  \"container\",                       /* Container */\n  \"header\",                          /* Header */\n  \"header-title\",                    /* Header title */\n  \"hero\",                            /* Hero */\n  \"main\",                            /* Main area */\n  \"navigation\",                      /* Navigation */\n  \"search\",                          /* Search */\n  \"search-query\",                    /* Search input */\n  \"search-reset\",                    /* Search reset */\n  \"search-result\",                   /* Search results */\n  \"tabs\",                            /* Tabs */\n  \"toc\"                              /* Table of contents */\n]\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Ensure that the given value is a valid configuration\n *\n * We could use `jsonschema` or any other schema validation framework, but that\n * would just add more bloat to the bundle, so we'll keep it plain and simple.\n *\n * @param config - Configuration\n *\n * @return Test result\n */\nfunction isConfig(config: any): config is Config {\n  return typeof config === \"object\"\n      && typeof config.base === \"string\"\n      && typeof config.worker === \"object\"\n      && typeof config.worker.search === \"string\"\n      && typeof config.worker.packer === \"string\"\n}\n\n/**\n * Yes, this is a super hacky implementation. Needs clean up.\n */\nfunction repository() {\n  const el = getElement<HTMLAnchorElement>(\".md-source[href]\") // TODO: dont use classes\n  console.log(el)\n  if (!el)\n    return EMPTY\n\n  const data = sessionStorage.getItem(\"repository\")\n  if (data) {\n    const x = JSON.parse(data)\n    return of(x)\n  }\n\n  // TODO: do correct rounding, see GitHub\n  function format(value: number) {\n    return value > 999\n      ? `${(value / 1000).toFixed(1)}k`\n      : `${(value)}`\n  }\n\n  // github repository...\n  const [, user, repo] = el.href.match(/^.+github\\.com\\/([^\\/]+)\\/?([^\\/]+)?.*$/i)\n\n  // storage memoization!?\n  // get, if not available, exec and persist\n\n  // getOrRetrieve... storage$.\n\n  // Show repo stats\n  if (user && repo) {\n    return fetchGitHubStats(user, repo)\n      .pipe(\n        map(({ stargazers_count, forks_count }) => ([\n          `${format(stargazers_count || 0)} Stars`,\n          `${format(forks_count || 0)} Forks`\n        ])),\n        tap(data => sessionStorage.setItem(\"repository\", JSON.stringify(data)))\n      )\n\n  // Show user or organization stats\n  } else if (user) {\n    return fetchGitHubStats(user)\n      .pipe(\n        map(({ public_repos }) => ([\n          `${format(public_repos || 0)} Repositories`\n        ])),\n        tap(data => sessionStorage.setItem(\"repository\", JSON.stringify(data)))\n      )\n  }\n  return of([])\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Initialize Material for MkDocs\n *\n * @param config - Configuration\n */\nexport function initialize(config: unknown) {\n  if (!isConfig(config))\n    throw new SyntaxError(`Invalid configuration: ${JSON.stringify(config)}`)\n\n  // TODO: WIP repo rendering\n  repository().subscribe(facts => {\n    if (facts.length) {\n      const sources = getElements(\".md-source__repository\")\n      sources.forEach(repo => {\n        repo.dataset.mdState = \"done\"\n        repo.appendChild(\n          renderSource(facts)\n        )\n      })\n    }\n  })\n\n  // pass config here!?\n  const document$ = watchDocument()\n  // const agent = {\n  //   document: {\n  //     load$:   watchDocument()\n  //   },\n  //   location: {\n  //     href$:   watchLocation(),\n  //     hash$:   watchLocationHash()\n  //   },\n  //   media: {\n  //     tablet$: watchMedia(\"(min-width: 960px)\"),\n  //     screen$: watchMedia(\"(min-width: 1220px)\")\n  //   },\n  //   viewport: {\n  //     offset$: watchViewportOffset(),\n  //     size$:   watchViewportSize()\n  //   }\n  // } // TODO: add a config parameter here to configure media queries\n  const hash$ = watchLocationHash()\n  const viewport$ = watchViewport()\n  const screen$ = watchMedia(\"(min-width: 960px)\")\n  const tablet$ = watchMedia(\"(min-width: 1220px)\")\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Create component map observable */\n  const components$ = watchComponentMap(names, { document$ })\n  const component = <T extends HTMLElement>(name: Component): Observable<T> => {\n    return components$\n      .pipe(\n        switchComponent<T>(name)\n      )\n  }\n\n  /* Create header observable */\n  const header$ = component(\"header\")  // TODO:!\n    .pipe(\n      switchMap(watchHeader)\n    )\n\n  /* Create header shadow toggle */\n  component(\"header\")\n    .pipe(\n      switchMap(el => main$\n        .pipe(\n          paintHeaderShadow(el) // technically, this could be done in paintMain\n        )\n      )\n    )\n      .subscribe()\n\n  // DONE\n  const main$ = component(\"main\")\n    .pipe(\n      switchMap(el => watchMain(el, { header$, viewport$ })),\n      shareReplay(1) // TODO: mount!?\n    )\n\n  // ---------------------------------------------------------------------------\n\n  /* ----------------------------------------------------------------------- */\n\n  const drawer = getElement<HTMLInputElement>(\"[data-md-toggle=drawer]\")!\n\n  /* ----------------------------------------------------------------------- */\n\n  // build a single search observable???\n\n  const query$ = component<HTMLInputElement>(\"search-query\")\n    .pipe(\n      switchMap(el => watchSearchQuery(el))\n    )\n\n  const sw = setupSearchWorker(config.worker.search, {\n    base: config.base,\n    query$\n  })\n\n  const result$ = sw.rx$ // move worker initialization into mountSearch ?\n    .pipe(\n      filter(isSearchResultMessage),\n      pluck(\"data\")\n    )\n\n  const search = getElement<HTMLInputElement>(\"[data-md-toggle=search]\")!\n  const searchActive$ = watchToggle(search)\n    .pipe(\n      delay(400)\n    )\n\n  query$\n    .pipe(\n      distinctUntilKeyChanged(\"focus\"),\n      tap(query => {\n        if (query.focus)\n          setToggle(search, query.focus) // paintSearchQuery?\n        // console.log(query)\n      })\n    )\n      .subscribe()\n\n  // implement toggle function that returns the toggles as observable...\n  const reset$ = component(\"search-reset\")\n    .pipe(\n      switchMap(watchSearchReset)\n    )\n\n  /* ----------------------------------------------------------------------- */\n\n  // DONE (partly)\n  const navigation$ = component(\"navigation\")\n    .pipe(\n      mountNavigation({ main$, viewport$, screen$ })\n    )\n\n  const toc$ = component(\"toc\")\n    .pipe(\n      mountTableOfContents({ header$, main$, viewport$, tablet$ })\n    )\n\n  // TODO: naming?\n  const resultComponent$ = component(\"search-result\")\n    .pipe(\n      mountSearchResult({ viewport$, result$, query$: query$.pipe(\n        distinctUntilKeyChanged(\"value\"),\n      ) })\n    ) // temporary fix\n\n  // mount hideable...\n\n  const tabs$ = component(\"tabs\")\n    .pipe(\n      mountTabs({ header$, viewport$, screen$ })\n    )\n\n  const hero$ = component(\"hero\")\n    .pipe(\n      mountHero({ header$, viewport$, screen$ })\n    )\n\n  // function watchKeyboard\n  const key$ = watchKeyboard()\n\n  // shortcodes\n  key$\n    .pipe(\n      takeIf(not(searchActive$))\n    )\n      .subscribe(key => {\n        if (\n          document.activeElement && (\n            [\"TEXTAREA\", \"SELECT\", \"INPUT\"].includes(\n              document.activeElement.tagName\n            ) ||\n            document.activeElement instanceof HTMLElement &&\n            document.activeElement.isContentEditable\n          )\n        ) {\n          // do nothing...\n        } else {\n          if (key.type === \"KeyS\" || key.type === \"KeyF\") {\n            setToggle(search, true)\n          }\n        }\n      })\n  // check which element is focused...\n  // note that all links have tabindex=-1\n  key$\n    .pipe(\n      takeIf(searchActive$),\n\n      /* Abort if meta key (macOS) or ctrl key (Windows) is pressed */\n      tap(key => {\n        console.log(\"jo\", key)\n        if (key.type === \"Enter\") {\n          if (document.activeElement === getElement(\"[data-md-component=search-query]\")) {\n            key.claim()\n            // intercept hash change after search closed\n          } else {\n            setToggle(search, false)\n          }\n        }\n\n        if (key.type === \"ArrowUp\" || key.type === \"ArrowDown\") {\n          const active = getElements(\"[data-md-component=search-query], [data-md-component=search-result] [href]\")\n          const i = Math.max(0, active.findIndex(el => el === document.activeElement))\n          const x = Math.max(0, (i + active.length + (key.type === \"ArrowUp\" ? -1 : +1)) % active.length)\n          active[x].focus()\n\n          /* Prevent scrolling of page */\n          key.claim()\n\n        } else if (key.type === \"Escape\" || key.type === \"Tab\") {\n          setToggle(search, false)\n          getElement(\"[data-md-component=search-query]\")!.blur()\n\n        } else {\n          if (search.checked && document.activeElement !== getElement(\"[data-md-component=search-query]\")) {\n            getElement(\"[data-md-component=search-query]\")!.focus()\n          }\n        }\n      })\n    )\n      .subscribe()\n\n  // TODO: close search on hashchange\n  // anchor jump -> always close drawer + search\n\n  // focus search on reset, on toggle and on keypress if open\n  merge(searchActive$.pipe(filter(identity)), reset$)\n    .pipe(\n      switchMapTo(component<HTMLInputElement>(\"search-query\")),\n      tap(el => el.focus()) // TODO: only if element isnt focused! setFocus? setToggle?\n    )\n      .subscribe()\n\n      // focusable -> setFocus(true, false)\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Open details before printing */\n  merge(\n    watchMedia(\"print\").pipe(filter(identity)), // Webkit\n    fromEvent(window, \"beforeprint\") // IE, FF\n  )\n    .subscribe(() => {\n      const details = getElements(\"details\")\n      Array.prototype.forEach.call(details, detail => {\n        detail.setAttribute(\"open\", \"\")\n      })\n    })\n\n  // Close drawer and search on hash change\n  hash$.subscribe(() => {\n    setToggle(drawer, false)\n    setToggle(search, false) // we probably need to delay the anchor jump for search\n  })\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Clipboard.js integration */\n  if (Clipboard.isSupported()) {\n    const blocks = getElements(\"pre > code\")\n    for (const [index, block] of blocks.entries()) {\n      const parent = block.parentElement!\n      parent.id = `__code_${index}`\n      parent.insertBefore(renderClipboard(parent.id), block)\n    }\n\n    /* Initialize Clipboard listener */\n    const copy = new Clipboard(\".md-clipboard\") // create observable...\n\n    /* Success handler */\n    // copy.on(\"success\", action => {\n    //   alert(\"Copied to clipboard\") // TODO: integrate snackbar\n    //   // TODO: add a snackbar/notification\n\n    // })\n  }\n\n  /* Wrap all data tables for better overflow scrolling */\n  const tables = getElements<HTMLTableElement>(\"table:not([class])\")\n  const placeholder = document.createElement(\"table\")\n  tables.forEach(table => {\n    table.replaceWith(placeholder)\n    placeholder.replaceWith(renderTable(table))\n  })\n\n  // search lock\n  let lastOffset = 0\n  tablet$.pipe(\n    switchMap(active => {\n      return !active ? watchToggle(search) : EMPTY\n    }),\n    switchMap(toggle => {\n      if (toggle) {\n        console.log(\"ACTIVE\")\n        return of(document.body)\n          .pipe(\n            tap(() => lastOffset = window.pageYOffset),\n            delay(400),\n            tap(() => {\n              window.scrollTo(0, 0),\n              console.log(\"scrolled... to top, locked body\")\n              document.body.dataset.mdState = \"lock\"\n            })\n          )\n      } else {\n        console.log(\"INACTIVE\")\n        return of(document.body)\n          .pipe(\n            tap(() => document.body.dataset.mdState = \"\"),\n            delay(100),\n            tap(() => {\n              window.scrollTo(0, lastOffset)\n            })\n          )\n      }\n      return EMPTY\n    })\n  )\n    .subscribe(x => console.log(\"SEARCHLOCK\", x))\n\n  /* ----------------------------------------------------------------------- */\n\n  // get headerHEIGHT! only if header is sticky!\n\n  // // lockHeader at...\n  // const direction$ = agent.viewport.offset$.pipe(\n  //   bufferCount(2, 1), // determine scroll direction\n  //   map(([{ y: y0 }, { y: y1 }]) => y1 > y0),\n  //   distinctUntilChanged(),\n  // )\n\n  // document.body.style.minHeight = \"100vh\"\n\n  // // if true => then + HEADER. otherwise not\n  // let last = 0\n  // combineLatest([direction$, header$]).pipe(\n  //   tap(([direction, { height }]) => { // TODO: only if sticky!\n  //     const offset = 48\n  //     console.log(window.pageYOffset, height, last)\n  //     if (Math.abs(window.pageYOffset - last) < height + offset) { // TODO: add sensitivity offset!\n  //       return\n  //     }\n  //     if (direction) {\n  //       document.body.style.height = `${window.pageYOffset + offset + height}px`\n  //     } else {\n  //       document.body.style.height = `${window.pageYOffset - offset}px` // offset\n  //     }\n  //     last = window.pageYOffset\n  //   })\n  // )\n  //   .subscribe()\n\n  // // toiggle\n\n  /* ----------------------------------------------------------------------- */\n\n  const state = {\n    search: {\n      query$,\n      result$: resultComponent$,\n      reset$,\n    },\n    main$,\n    navigation$,\n    toc$,\n    tabs$,\n    hero$\n  }\n\n  const { search: temp, ...rest } = state\n  merge(...values(rest), ...values(temp))\n    .subscribe() // potential memleak <-- use takeUntil\n\n  return {\n    // agent,\n    state\n  }\n}\n\n// function mountSearchQuery(\n\n// ): OperatorFunction<HTMLInputElement, SearchQuery> {\n//   return pipe(\n//     switchMap(el => watchSearchQuery(el))\n//   )\n// }\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { keys } from \"ramda\"\nimport { NEVER, Observable, OperatorFunction, of, pipe } from \"rxjs\"\nimport { map, scan, shareReplay, switchMap } from \"rxjs/operators\"\n\nimport { getElement } from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Component names\n */\nexport type Component =\n  | \"container\"                        /* Container */\n  | \"header\"                           /* Header */\n  | \"header-title\"                     /* Header title */\n  | \"hero\"                             /* Hero */\n  | \"main\"                             /* Main area */\n  | \"navigation\"                       /* Navigation */\n  | \"search\"                           /* Search */\n  | \"search-query\"                     /* Search input */\n  | \"search-reset\"                     /* Search reset */\n  | \"search-result\"                    /* Search results */\n  | \"tabs\"                             /* Tabs */\n  | \"toc\"                              /* Table of contents */\n\n/**\n * Component map\n */\nexport type ComponentMap = {\n  [P in Component]?: HTMLElement\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  document$: Observable<Document>      /* Document observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch component mapping\n *\n * This function returns an observable that will maintain bindings to the given\n * components in-between document switches and update the document in-place.\n *\n * @param names - Component names\n * @param options - Options\n *\n * @return Component mapping observable\n */\nexport function watchComponentMap(\n  names: Component[], { document$ }: Options\n): Observable<ComponentMap> {\n  const components$ = document$\n    .pipe(\n\n      /* Build component map */\n      map(document => names.reduce<ComponentMap>((components, name) => {\n        const el = getElement(`[data-md-component=${name}]`, document)\n        return {\n          ...components,\n          ...typeof el !== \"undefined\" ? { [name]: el } : {}\n        }\n      }, {})),\n\n      /* Re-compute component map on document switch */\n      scan((prev, next) => {\n        for (const name of keys(prev)) {\n          switch (name) {\n\n            /* Top-level components: update */\n            case \"header-title\":\n            case \"container\":\n              if (name in prev && typeof prev[name] !== \"undefined\") {\n                prev[name]!.replaceWith(next[name]!)\n                prev[name] = next[name]\n              }\n              break\n\n            /* All other components: rebind */\n            default:\n              prev[name] = getElement(`[data-md-component=${name}]`)\n          }\n        }\n        return prev\n      })\n    )\n\n  /* Return component map as hot observable */\n  return components$\n    .pipe(\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Switch to component\n *\n * @template T - Element type\n *\n * @param name - Component name\n *\n * @return Operator function\n */\nexport function switchComponent<T extends HTMLElement>(\n  name: Component\n): OperatorFunction<ComponentMap, T> {\n  return pipe(\n    switchMap(components => {\n      return typeof components[name] !== \"undefined\"\n        ? of(components[name] as T)\n        : NEVER\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  MonoTypeOperatorFunction,\n  animationFrameScheduler,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilKeyChanged,\n  finalize,\n  observeOn,\n  tap\n} from \"rxjs/operators\"\n\nimport { resetHeaderShadow, setHeaderShadow } from \"actions\"\n\nimport { MainState } from \"../../main\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint header shadow from source observable\n *\n * @param el - Header element\n *\n * @return Operator function\n */\nexport function paintHeaderShadow(\n  el: HTMLElement\n): MonoTypeOperatorFunction<MainState> {\n  return pipe(\n    distinctUntilKeyChanged(\"active\"),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ active }) => {\n      setHeaderShadow(el, active)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetHeaderShadow(el)\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set header shadow\n *\n * @param el - Header element\n * @param value - Whether the shadow is shown\n */\nexport function setHeaderShadow(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"shadow\" : \"\")\n}\n\n/**\n * Reset header shadow\n *\n * @param el - Header element\n */\nexport function resetHeaderShadow(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  map,\n  pluck,\n  shareReplay\n} from \"rxjs/operators\"\n\nimport { Viewport } from \"../../agent\"\nimport { Header } from \"../../header\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Main area\n */\nexport interface Main {\n  offset: number                       /* Main area top offset */\n  height: number                       /* Main area visible height */\n  active: boolean                      /* Scrolled past top offset */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  viewport$: Observable<Viewport>      /* Viewport observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch main area\n *\n * This function returns an observable that computes the visual parameters of\n * the main area which depends on the viewport vertical offset and height, as\n * well as the height of the header element, if the header is fixed.\n *\n * @param el - Main area element\n * @param options - Options\n *\n * @return Main area observable\n */\nexport function watchMain(\n  el: HTMLElement, { header$, viewport$ }: Options\n): Observable<Main> {\n\n  /* Compute necessary adjustment for header */\n  const adjust$ = header$\n    .pipe(\n      pluck(\"height\")\n    )\n\n  /* Compute the main area's visible height */\n  const height$ = combineLatest([viewport$, adjust$])\n    .pipe(\n      map(([{ offset: { y }, size: { height } }, adjust]) => {\n        const top    = el.offsetTop\n        const bottom = el.offsetHeight + top\n        return height\n          - Math.max(0, top    - y,  adjust)\n          - Math.max(0, height + y - bottom)\n      }),\n      distinctUntilChanged()\n    )\n\n  /* Compute whether the viewport offset is past the main area's top */\n  const active$ = combineLatest([viewport$, adjust$])\n    .pipe(\n      map(([{ offset: { y } }, adjust]) => y >= el.offsetTop - adjust),\n      distinctUntilChanged()\n    )\n\n  /* Combine into a single hot observable */\n  return combineLatest([height$, adjust$, active$])\n    .pipe(\n      map(([height, adjust, active]) => ({\n        offset: el.offsetTop - adjust,\n        height,\n        active\n      })),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, Subject } from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport { distinctUntilKeyChanged, map, pluck } from \"rxjs/operators\"\n\nimport { SearchIndexOptions } from \"modules\"\nimport {\n  SearchQuery,\n  WorkerHandler,\n  watchWorker\n} from \"observables\"\n\nimport {\n  SearchMessage,\n  SearchMessageType,\n  SearchQueryMessage,\n  SearchSetupMessage,\n  isSearchResultMessage\n} from \"../message\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  base: string                         /* Base url */\n  query$: Observable<SearchQuery>      /* Search query observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Setup search web worker\n *\n * @param url - Worker url\n * @param options - Options\n *\n * @return Worker handler\n */\nexport function setupSearchWorker(\n  url: string, { base, query$ }: Options\n): WorkerHandler<SearchMessage> {\n  const worker = new Worker(url)\n  const prefix = new URL(base, location.href)\n\n  /* Create communication channels and correct relative links */\n  const tx$ = new Subject<SearchMessage>()\n  const rx$ = watchWorker(worker, { tx$ })\n    .pipe(\n      map(message => {\n        if (isSearchResultMessage(message)) {\n          for (const { article, sections } of message.data) {\n            article.location = `${prefix}/${article.location}`\n            for (const section of sections)\n              section.location = `${prefix}/${section.location}`\n          }\n        }\n        return message\n      })\n    )\n\n  /* Fetch index and setup search worker */\n  ajax({\n    url: `${base}/search/search_index.json`,\n    responseType: \"json\",\n    withCredentials: true\n  })\n    .pipe(\n      pluck(\"response\"),\n      map<SearchIndexOptions, SearchSetupMessage>(data => ({\n        type: SearchMessageType.SETUP,\n        data\n      }))\n    )\n      .subscribe(tx$.next.bind(tx$))\n\n  /* Subscribe to search query */\n  query$\n    .pipe(\n      distinctUntilKeyChanged(\"value\"),\n      map<SearchQuery, SearchQueryMessage>(query => ({\n        type: SearchMessageType.QUERY,\n        data: query.value\n      }))\n    )\n      .subscribe(tx$.next.bind(tx$))\n\n  /* Return worker handler */\n  return { tx$, rx$ }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable } from \"rxjs\"\nimport { map } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Invert boolean value of source observable\n *\n * @param toggle$ - Toggle observable\n *\n * @return Inverted toggle observable\n */\nexport function not(\n  toggle$: Observable<boolean>\n): Observable<boolean> {\n  return toggle$\n    .pipe(\n      map(active => !active)\n    )\n}\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/javascripts/bundle.96943303.min.js b/material/assets/javascripts/bundle.96943303.min.js
deleted file mode 100644
index e4865eb09..000000000
--- a/material/assets/javascripts/bundle.96943303.min.js
+++ /dev/null
@@ -1,9 +0,0 @@
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Fr=["container","header","header-title","hero","main","navigation","search","search-query","search-reset","search-result","tabs","toc"];function zr(t){var e=t.replace(/(?:^|\s+)[*+-:^~]+(?=\s+|$)/g,"").trim();return e?e.replace(/\s+|$/g,"* "):""}function Vr(t){t.base=t.base.replace(/\/$/,"");var e=new Worker(t.worker.search),n=new Worker(t.worker.packer),r=new F,o=We(n,{message$:r});o.subscribe((function(t){t.type===Er.BINARY&&"{"!==t.data[0]&&localStorage.setItem("index",t.data)}));var i=new F,u=We(e,{message$:i});u.pipe(Nt(jr),J((function(t){return{type:Er.STRING,data:t.data}})),Pt((function(t){return r.next(t)}))).subscribe();var s,c=It({url:t.base+"/search/search_index.json",responseType:"json",withCredentials:!0}).pipe(Rt("response")),a=localStorage.getItem("index");return(a?W({type:Er.BINARY,data:localStorage.getItem("index")}):B).subscribe((function(t){r.next(t)})),function(){for(var t=[],e=0;e<arguments.length;e++)t[e]=arguments[e];if(1===t.length){var n=t[0];if(E(n))return 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H=Lr(L.value,2),D=H[0],z=H[1],V=z.parentElement;V.id="__code_"+D,V.insertBefore((S=V.id,In("button",{class:Ir.container,title:Dn("clipboard.copy"),"data-clipboard-target":"#"+S+" code"},"")),z)}}catch(t){e={error:t}}finally{try{L&&!L.done&&(n=R.return)&&n.call(R)}finally{if(e)throw e.error}}new r(".md-clipboard")}var U=Oe("table:not([class])"),Y=document.createElement("table");U.forEach((function(t){t.replaceWith(Y),Y.replaceWith(function(t){return In("div",{class:qr.wrapper},In("div",{class:qr.table},t))}(t))}));var X=0;f.pipe(Ft((function(t){return t?B:vr(N)})),Ft((function(t){return t?(console.log("ACTIVE"),W(document.body).pipe(Pt((function(){return X=window.pageYOffset})),fe(400),Pt((function(){window.scrollTo(0,0),console.log("scrolled... to top, locked body"),document.body.dataset.mdState="lock"})))):(console.log("INACTIVE"),W(document.body).pipe(Pt((function(){return document.body.dataset.mdState=""})),fe(100),Pt((function(){window.scrollTo(0,X)}))))}))).subscribe((function(t){return console.log("SEARCHLOCK",t)}));var G={search:{query$:w,result$:k,reset$:$},main$:E,navigation$:T,toc$:O,tabs$:j,hero$:A},K=G.search,Q=Rr(G,["search"]);return yt.apply(void 0,Dr(v(Q),v(K))).subscribe(),{agent:i,state:G}}}]));
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index baa7700f8..000000000
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__webpack_require__) {\n\n\"use strict\";\n\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nvar _clipboardAction = __webpack_require__(1);\n\nvar _clipboardAction2 = _interopRequireDefault(_clipboardAction);\n\nvar _tinyEmitter = __webpack_require__(3);\n\nvar _tinyEmitter2 = _interopRequireDefault(_tinyEmitter);\n\nvar _goodListener = __webpack_require__(4);\n\nvar _goodListener2 = _interopRequireDefault(_goodListener);\n\nfunction _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return call && (typeof call === \"object\" || typeof call === \"function\") ? call : self; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function, not \" + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }\n\n/**\n * Base class which takes one or more elements, adds event listeners to them,\n * and instantiates a new `ClipboardAction` on each click.\n */\nvar Clipboard = function (_Emitter) {\n    _inherits(Clipboard, _Emitter);\n\n    /**\n     * @param {String|HTMLElement|HTMLCollection|NodeList} trigger\n     * @param {Object} options\n     */\n    function Clipboard(trigger, options) {\n        _classCallCheck(this, Clipboard);\n\n        var _this = _possibleConstructorReturn(this, (Clipboard.__proto__ || Object.getPrototypeOf(Clipboard)).call(this));\n\n        _this.resolveOptions(options);\n        _this.listenClick(trigger);\n        return _this;\n    }\n\n    /**\n     * Defines if attributes would be resolved using internal setter functions\n     * or custom functions that were passed in the constructor.\n     * @param {Object} options\n     */\n\n\n    _createClass(Clipboard, [{\n        key: 'resolveOptions',\n        value: function resolveOptions() {\n            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n            this.action = typeof options.action === 'function' ? options.action : this.defaultAction;\n            this.target = typeof options.target === 'function' ? options.target : this.defaultTarget;\n            this.text = typeof options.text === 'function' ? options.text : this.defaultText;\n            this.container = _typeof(options.container) === 'object' ? options.container : document.body;\n        }\n\n        /**\n         * Adds a click event listener to the passed trigger.\n         * @param {String|HTMLElement|HTMLCollection|NodeList} trigger\n         */\n\n    }, {\n        key: 'listenClick',\n        value: function listenClick(trigger) {\n            var _this2 = this;\n\n            this.listener = (0, _goodListener2.default)(trigger, 'click', function (e) {\n                return _this2.onClick(e);\n            });\n        }\n\n        /**\n         * Defines a new `ClipboardAction` on each click event.\n         * @param {Event} e\n         */\n\n    }, {\n        key: 'onClick',\n        value: function onClick(e) {\n            var trigger = e.delegateTarget || e.currentTarget;\n\n            if (this.clipboardAction) {\n                this.clipboardAction = null;\n            }\n\n            this.clipboardAction = new _clipboardAction2.default({\n                action: this.action(trigger),\n                target: this.target(trigger),\n                text: this.text(trigger),\n                container: this.container,\n                trigger: trigger,\n                emitter: this\n            });\n        }\n\n        /**\n         * Default `action` lookup function.\n         * @param {Element} trigger\n         */\n\n    }, {\n        key: 'defaultAction',\n        value: function defaultAction(trigger) {\n            return getAttributeValue('action', trigger);\n        }\n\n        /**\n         * Default `target` lookup function.\n         * @param {Element} trigger\n         */\n\n    }, {\n        key: 'defaultTarget',\n        value: function defaultTarget(trigger) {\n            var selector = getAttributeValue('target', trigger);\n\n            if (selector) {\n                return document.querySelector(selector);\n            }\n        }\n\n        /**\n         * Returns the support of the given action, or all actions if no action is\n         * given.\n         * @param {String} [action]\n         */\n\n    }, {\n        key: 'defaultText',\n\n\n        /**\n         * Default `text` lookup function.\n         * @param {Element} trigger\n         */\n        value: function defaultText(trigger) {\n            return getAttributeValue('text', trigger);\n        }\n\n        /**\n         * Destroy lifecycle.\n         */\n\n    }, {\n        key: 'destroy',\n        value: function destroy() {\n            this.listener.destroy();\n\n            if (this.clipboardAction) {\n                this.clipboardAction.destroy();\n                this.clipboardAction = null;\n            }\n        }\n    }], [{\n        key: 'isSupported',\n        value: function isSupported() {\n            var action = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : ['copy', 'cut'];\n\n            var actions = typeof action === 'string' ? [action] : action;\n            var support = !!document.queryCommandSupported;\n\n            actions.forEach(function (action) {\n                support = support && !!document.queryCommandSupported(action);\n            });\n\n            return support;\n        }\n    }]);\n\n    return Clipboard;\n}(_tinyEmitter2.default);\n\n/**\n * Helper function to retrieve attribute value.\n * @param {String} suffix\n * @param {Element} element\n */\n\n\nfunction getAttributeValue(suffix, element) {\n    var attribute = 'data-clipboard-' + suffix;\n\n    if (!element.hasAttribute(attribute)) {\n        return;\n    }\n\n    return element.getAttribute(attribute);\n}\n\nmodule.exports = Clipboard;\n\n/***/ }),\n/* 1 */\n/***/ (function(module, exports, __webpack_require__) {\n\n\"use strict\";\n\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();\n\nvar _select = __webpack_require__(2);\n\nvar _select2 = _interopRequireDefault(_select);\n\nfunction _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\n/**\n * Inner class which performs selection from either `text` or `target`\n * properties and then executes copy or cut operations.\n */\nvar ClipboardAction = function () {\n    /**\n     * @param {Object} options\n     */\n    function ClipboardAction(options) {\n        _classCallCheck(this, ClipboardAction);\n\n        this.resolveOptions(options);\n        this.initSelection();\n    }\n\n    /**\n     * Defines base properties passed from constructor.\n     * @param {Object} options\n     */\n\n\n    _createClass(ClipboardAction, [{\n        key: 'resolveOptions',\n        value: function resolveOptions() {\n            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n            this.action = options.action;\n            this.container = options.container;\n            this.emitter = options.emitter;\n            this.target = options.target;\n            this.text = options.text;\n            this.trigger = options.trigger;\n\n            this.selectedText = '';\n        }\n\n        /**\n         * Decides which selection strategy is going to be applied based\n         * on the existence of `text` and `target` properties.\n         */\n\n    }, {\n        key: 'initSelection',\n        value: function initSelection() {\n            if (this.text) {\n                this.selectFake();\n            } else if (this.target) {\n                this.selectTarget();\n            }\n        }\n\n        /**\n         * Creates a fake textarea element, sets its value from `text` property,\n         * and makes a selection on it.\n         */\n\n    }, {\n        key: 'selectFake',\n        value: function selectFake() {\n            var _this = this;\n\n            var isRTL = document.documentElement.getAttribute('dir') == 'rtl';\n\n            this.removeFake();\n\n            this.fakeHandlerCallback = function () {\n                return _this.removeFake();\n            };\n            this.fakeHandler = this.container.addEventListener('click', this.fakeHandlerCallback) || true;\n\n            this.fakeElem = document.createElement('textarea');\n            // Prevent zooming on iOS\n            this.fakeElem.style.fontSize = '12pt';\n            // Reset box model\n            this.fakeElem.style.border = '0';\n            this.fakeElem.style.padding = '0';\n            this.fakeElem.style.margin = '0';\n            // Move element out of screen horizontally\n            this.fakeElem.style.position = 'absolute';\n            this.fakeElem.style[isRTL ? 'right' : 'left'] = '-9999px';\n            // Move element to the same position vertically\n            var yPosition = window.pageYOffset || document.documentElement.scrollTop;\n            this.fakeElem.style.top = yPosition + 'px';\n\n            this.fakeElem.setAttribute('readonly', '');\n            this.fakeElem.value = this.text;\n\n            this.container.appendChild(this.fakeElem);\n\n            this.selectedText = (0, _select2.default)(this.fakeElem);\n            this.copyText();\n        }\n\n        /**\n         * Only removes the fake element after another click event, that way\n         * a user can hit `Ctrl+C` to copy because selection still exists.\n         */\n\n    }, {\n        key: 'removeFake',\n        value: function removeFake() {\n            if (this.fakeHandler) {\n                this.container.removeEventListener('click', this.fakeHandlerCallback);\n                this.fakeHandler = null;\n                this.fakeHandlerCallback = null;\n            }\n\n            if (this.fakeElem) {\n                this.container.removeChild(this.fakeElem);\n                this.fakeElem = null;\n            }\n        }\n\n        /**\n         * Selects the content from element passed on `target` property.\n         */\n\n    }, {\n        key: 'selectTarget',\n        value: function selectTarget() {\n            this.selectedText = (0, _select2.default)(this.target);\n            this.copyText();\n        }\n\n        /**\n         * Executes the copy operation based on the current selection.\n         */\n\n    }, {\n        key: 'copyText',\n        value: function copyText() {\n            var succeeded = void 0;\n\n            try {\n                succeeded = document.execCommand(this.action);\n            } catch (err) {\n                succeeded = false;\n            }\n\n            this.handleResult(succeeded);\n        }\n\n        /**\n         * Fires an event based on the copy operation result.\n         * @param {Boolean} succeeded\n         */\n\n    }, {\n        key: 'handleResult',\n        value: function handleResult(succeeded) {\n            this.emitter.emit(succeeded ? 'success' : 'error', {\n                action: this.action,\n                text: this.selectedText,\n                trigger: this.trigger,\n                clearSelection: this.clearSelection.bind(this)\n            });\n        }\n\n        /**\n         * Moves focus away from `target` and back to the trigger, removes current selection.\n         */\n\n    }, {\n        key: 'clearSelection',\n        value: function clearSelection() {\n            if (this.trigger) {\n                this.trigger.focus();\n            }\n\n            window.getSelection().removeAllRanges();\n        }\n\n        /**\n         * Sets the `action` to be performed which can be either 'copy' or 'cut'.\n         * @param {String} action\n         */\n\n    }, {\n        key: 'destroy',\n\n\n        /**\n         * Destroy lifecycle.\n         */\n        value: function destroy() {\n            this.removeFake();\n        }\n    }, {\n        key: 'action',\n        set: function set() {\n            var action = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'copy';\n\n            this._action = action;\n\n            if (this._action !== 'copy' && this._action !== 'cut') {\n                throw new Error('Invalid \"action\" value, use either \"copy\" or \"cut\"');\n            }\n        }\n\n        /**\n         * Gets the `action` property.\n         * @return {String}\n         */\n        ,\n        get: function get() {\n            return this._action;\n        }\n\n        /**\n         * Sets the `target` property using an element\n         * that will be have its content copied.\n         * @param {Element} target\n         */\n\n    }, {\n        key: 'target',\n        set: function set(target) {\n            if (target !== undefined) {\n                if (target && (typeof target === 'undefined' ? 'undefined' : _typeof(target)) === 'object' && target.nodeType === 1) {\n                    if (this.action === 'copy' && target.hasAttribute('disabled')) {\n                        throw new Error('Invalid \"target\" attribute. Please use \"readonly\" instead of \"disabled\" attribute');\n                    }\n\n                    if (this.action === 'cut' && (target.hasAttribute('readonly') || target.hasAttribute('disabled'))) {\n                        throw new Error('Invalid \"target\" attribute. You can\\'t cut text from elements with \"readonly\" or \"disabled\" attributes');\n                    }\n\n                    this._target = target;\n                } else {\n                    throw new Error('Invalid \"target\" value, use a valid Element');\n                }\n            }\n        }\n\n        /**\n         * Gets the `target` property.\n         * @return {String|HTMLElement}\n         */\n        ,\n        get: function get() {\n            return this._target;\n        }\n    }]);\n\n    return ClipboardAction;\n}();\n\nmodule.exports = ClipboardAction;\n\n/***/ }),\n/* 2 */\n/***/ (function(module, exports) {\n\nfunction select(element) {\n    var selectedText;\n\n    if (element.nodeName === 'SELECT') {\n        element.focus();\n\n        selectedText = element.value;\n    }\n    else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {\n        var isReadOnly = element.hasAttribute('readonly');\n\n        if (!isReadOnly) {\n            element.setAttribute('readonly', '');\n        }\n\n        element.select();\n        element.setSelectionRange(0, element.value.length);\n\n        if (!isReadOnly) {\n            element.removeAttribute('readonly');\n        }\n\n        selectedText = element.value;\n    }\n    else {\n        if (element.hasAttribute('contenteditable')) {\n            element.focus();\n        }\n\n        var selection = window.getSelection();\n        var range = document.createRange();\n\n        range.selectNodeContents(element);\n        selection.removeAllRanges();\n        selection.addRange(range);\n\n        selectedText = selection.toString();\n    }\n\n    return selectedText;\n}\n\nmodule.exports = select;\n\n\n/***/ }),\n/* 3 */\n/***/ (function(module, exports) {\n\nfunction E () {\n  // Keep this empty so it's easier to inherit from\n  // (via https://github.com/lipsmack from https://github.com/scottcorgan/tiny-emitter/issues/3)\n}\n\nE.prototype = {\n  on: function (name, callback, ctx) {\n    var e = this.e || (this.e = {});\n\n    (e[name] || (e[name] = [])).push({\n      fn: callback,\n      ctx: ctx\n    });\n\n    return this;\n  },\n\n  once: function (name, callback, ctx) {\n    var self = this;\n    function listener () {\n      self.off(name, listener);\n      callback.apply(ctx, arguments);\n    };\n\n    listener._ = callback\n    return this.on(name, listener, ctx);\n  },\n\n  emit: function (name) {\n    var data = [].slice.call(arguments, 1);\n    var evtArr = ((this.e || (this.e = {}))[name] || []).slice();\n    var i = 0;\n    var len = evtArr.length;\n\n    for (i; i < len; i++) {\n      evtArr[i].fn.apply(evtArr[i].ctx, data);\n    }\n\n    return this;\n  },\n\n  off: function (name, callback) {\n    var e = this.e || (this.e = {});\n    var evts = e[name];\n    var liveEvents = [];\n\n    if (evts && callback) {\n      for (var i = 0, len = evts.length; i < len; i++) {\n        if (evts[i].fn !== callback && evts[i].fn._ !== callback)\n          liveEvents.push(evts[i]);\n      }\n    }\n\n    // Remove event from queue to prevent memory leak\n    // Suggested by https://github.com/lazd\n    // Ref: https://github.com/scottcorgan/tiny-emitter/commit/c6ebfaa9bc973b33d110a84a307742b7cf94c953#commitcomment-5024910\n\n    (liveEvents.length)\n      ? e[name] = liveEvents\n      : delete e[name];\n\n    return this;\n  }\n};\n\nmodule.exports = E;\n\n\n/***/ }),\n/* 4 */\n/***/ (function(module, exports, __webpack_require__) {\n\nvar is = __webpack_require__(5);\nvar delegate = __webpack_require__(6);\n\n/**\n * Validates all params and calls the right\n * listener function based on its target type.\n *\n * @param {String|HTMLElement|HTMLCollection|NodeList} target\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listen(target, type, callback) {\n    if (!target && !type && !callback) {\n        throw new Error('Missing required arguments');\n    }\n\n    if (!is.string(type)) {\n        throw new TypeError('Second argument must be a String');\n    }\n\n    if (!is.fn(callback)) {\n        throw new TypeError('Third argument must be a Function');\n    }\n\n    if (is.node(target)) {\n        return listenNode(target, type, callback);\n    }\n    else if (is.nodeList(target)) {\n        return listenNodeList(target, type, callback);\n    }\n    else if (is.string(target)) {\n        return listenSelector(target, type, callback);\n    }\n    else {\n        throw new TypeError('First argument must be a String, HTMLElement, HTMLCollection, or NodeList');\n    }\n}\n\n/**\n * Adds an event listener to a HTML element\n * and returns a remove listener function.\n *\n * @param {HTMLElement} node\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenNode(node, type, callback) {\n    node.addEventListener(type, callback);\n\n    return {\n        destroy: function() {\n            node.removeEventListener(type, callback);\n        }\n    }\n}\n\n/**\n * Add an event listener to a list of HTML elements\n * and returns a remove listener function.\n *\n * @param {NodeList|HTMLCollection} nodeList\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenNodeList(nodeList, type, callback) {\n    Array.prototype.forEach.call(nodeList, function(node) {\n        node.addEventListener(type, callback);\n    });\n\n    return {\n        destroy: function() {\n            Array.prototype.forEach.call(nodeList, function(node) {\n                node.removeEventListener(type, callback);\n            });\n        }\n    }\n}\n\n/**\n * Add an event listener to a selector\n * and returns a remove listener function.\n *\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @return {Object}\n */\nfunction listenSelector(selector, type, callback) {\n    return delegate(document.body, selector, type, callback);\n}\n\nmodule.exports = listen;\n\n\n/***/ }),\n/* 5 */\n/***/ (function(module, exports) {\n\n/**\n * Check if argument is a HTML element.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.node = function(value) {\n    return value !== undefined\n        && value instanceof HTMLElement\n        && value.nodeType === 1;\n};\n\n/**\n * Check if argument is a list of HTML elements.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.nodeList = function(value) {\n    var type = Object.prototype.toString.call(value);\n\n    return value !== undefined\n        && (type === '[object NodeList]' || type === '[object HTMLCollection]')\n        && ('length' in value)\n        && (value.length === 0 || exports.node(value[0]));\n};\n\n/**\n * Check if argument is a string.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.string = function(value) {\n    return typeof value === 'string'\n        || value instanceof String;\n};\n\n/**\n * Check if argument is a function.\n *\n * @param {Object} value\n * @return {Boolean}\n */\nexports.fn = function(value) {\n    var type = Object.prototype.toString.call(value);\n\n    return type === '[object Function]';\n};\n\n\n/***/ }),\n/* 6 */\n/***/ (function(module, exports, __webpack_require__) {\n\nvar closest = __webpack_require__(7);\n\n/**\n * Delegates event to a selector.\n *\n * @param {Element} element\n * @param {String} selector\n * @param {String} type\n * @param {Function} callback\n * @param {Boolean} useCapture\n * @return {Object}\n */\nfunction _delegate(element, selector, type, callback, useCapture) {\n    var listenerFn = listener.apply(this, arguments);\n\n    element.addEventListener(type, listenerFn, useCapture);\n\n    return {\n        destroy: function() {\n            element.removeEventListener(type, listenerFn, useCapture);\n        }\n    }\n}\n\n/**\n * Delegates event to a selector.\n *\n * @param {Element|String|Array} [elements]\n * @param {String} 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[] : Object.keys(obj);\n}) : /*#__PURE__*/_curry1(function keys(obj) {\n  if (Object(obj) !== obj) {\n    return [];\n  }\n  var prop, nIdx;\n  var ks = [];\n  var checkArgsLength = hasArgsEnumBug && _isArguments(obj);\n  for (prop in obj) {\n    if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {\n      ks[ks.length] = prop;\n    }\n  }\n  if (hasEnumBug) {\n    nIdx = nonEnumerableProps.length - 1;\n    while (nIdx >= 0) {\n      prop = nonEnumerableProps[nIdx];\n      if (_has(prop, obj) && !contains(ks, prop)) {\n        ks[ks.length] = prop;\n      }\n      nIdx -= 1;\n    }\n  }\n  return ks;\n});\nexport default keys;","import _curry1 from './internal/_curry1.js';\nimport keys from './keys.js';\n\n/**\n * Returns a list of all the enumerable own properties of the supplied object.\n * Note that the order of the output array is not guaranteed across different\n * JS platforms.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Object\n * @sig {k: v} -> [v]\n * @param {Object} obj The object to extract values from\n * @return {Array} An array of the values of the object's own properties.\n * @see R.valuesIn, R.keys\n * @example\n *\n *      R.values({a: 1, b: 2, c: 3}); //=> [1, 2, 3]\n */\nvar values = /*#__PURE__*/_curry1(function values(obj) {\n  var props = keys(obj);\n  var len = props.length;\n  var vals = [];\n  var idx = 0;\n  while (idx < len) {\n    vals[idx] = obj[props[idx]];\n    idx += 1;\n  }\n  return vals;\n});\nexport default values;","/*! *****************************************************************************\r\nCopyright (c) Microsoft Corporation. All rights reserved.\r\nLicensed under the Apache License, Version 2.0 (the \"License\"); you may not use\r\nthis file except in compliance with the License. You may obtain a copy of the\r\nLicense at http://www.apache.org/licenses/LICENSE-2.0\r\n\r\nTHIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\r\nKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED\r\nWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,\r\nMERCHANTABLITY OR NON-INFRINGEMENT.\r\n\r\nSee the Apache Version 2.0 License for specific language governing permissions\r\nand limitations under the License.\r\n***************************************************************************** */\r\n/* global Reflect, Promise */\r\n\r\nvar extendStatics = function(d, b) {\r\n    extendStatics = Object.setPrototypeOf ||\r\n        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||\r\n        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };\r\n    return extendStatics(d, b);\r\n};\r\n\r\nexport function __extends(d, b) {\r\n    extendStatics(d, b);\r\n    function __() { this.constructor = d; }\r\n    d.prototype = b === null ? 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Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }\r\n    function fulfill(value) { resume(\"next\", value); }\r\n    function reject(value) { resume(\"throw\", value); }\r\n    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }\r\n}\r\n\r\nexport function __asyncDelegator(o) {\r\n    var i, p;\r\n    return i = {}, verb(\"next\"), verb(\"throw\", function (e) { throw e; }), verb(\"return\"), i[Symbol.iterator] = function () { return this; }, i;\r\n    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === \"return\" } : f ? f(v) : v; } : f; }\r\n}\r\n\r\nexport function __asyncValues(o) {\r\n    if (!Symbol.asyncIterator) throw new TypeError(\"Symbol.asyncIterator is not defined.\");\r\n    var m = o[Symbol.asyncIterator], i;\r\n    return m ? m.call(o) : (o = typeof __values === \"function\" ? __values(o) : o[Symbol.iterator](), i = {}, verb(\"next\"), verb(\"throw\"), verb(\"return\"), i[Symbol.asyncIterator] = function () { return this; }, i);\r\n    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }\r\n    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }\r\n}\r\n\r\nexport function __makeTemplateObject(cooked, raw) {\r\n    if (Object.defineProperty) { Object.defineProperty(cooked, \"raw\", { value: raw }); } else { cooked.raw = raw; }\r\n    return cooked;\r\n};\r\n\r\nexport function __importStar(mod) {\r\n    if (mod && mod.__esModule) return mod;\r\n    var result = {};\r\n    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];\r\n    result.default = mod;\r\n    return result;\r\n}\r\n\r\nexport function __importDefault(mod) {\r\n    return (mod && mod.__esModule) ? mod : { default: mod };\r\n}\r\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isFunction(x) {\n    return typeof x === 'function';\n}\n//# sourceMappingURL=isFunction.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar _enable_super_gross_mode_that_will_cause_bad_things = false;\nexport var config = {\n    Promise: undefined,\n    set useDeprecatedSynchronousErrorHandling(value) {\n        if (value) {\n            var error = /*@__PURE__*/ new Error();\n            /*@__PURE__*/ console.warn('DEPRECATED! RxJS was set to use deprecated synchronous error handling behavior by code at: \\n' + error.stack);\n        }\n        else if (_enable_super_gross_mode_that_will_cause_bad_things) {\n            /*@__PURE__*/ console.log('RxJS: Back to a better error behavior. Thank you. <3');\n        }\n        _enable_super_gross_mode_that_will_cause_bad_things = value;\n    },\n    get useDeprecatedSynchronousErrorHandling() {\n        return _enable_super_gross_mode_that_will_cause_bad_things;\n    },\n};\n//# sourceMappingURL=config.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function hostReportError(err) {\n    setTimeout(function () { throw err; }, 0);\n}\n//# sourceMappingURL=hostReportError.js.map\n","/** PURE_IMPORTS_START _config,_util_hostReportError PURE_IMPORTS_END */\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\nexport var empty = {\n    closed: true,\n    next: function (value) { },\n    error: function (err) {\n        if (config.useDeprecatedSynchronousErrorHandling) {\n            throw err;\n        }\n        else {\n            hostReportError(err);\n        }\n    },\n    complete: function () { }\n};\n//# sourceMappingURL=Observer.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var isArray = /*@__PURE__*/ (function () { return Array.isArray || (function (x) { return x && typeof x.length === 'number'; }); })();\n//# sourceMappingURL=isArray.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isObject(x) {\n    return x !== null && typeof x === 'object';\n}\n//# sourceMappingURL=isObject.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar UnsubscriptionErrorImpl = /*@__PURE__*/ (function () {\n    function UnsubscriptionErrorImpl(errors) {\n        Error.call(this);\n        this.message = errors ?\n            errors.length + \" errors occurred during unsubscription:\\n\" + errors.map(function (err, i) { return i + 1 + \") \" + err.toString(); }).join('\\n  ') : '';\n        this.name = 'UnsubscriptionError';\n        this.errors = errors;\n        return this;\n    }\n    UnsubscriptionErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return UnsubscriptionErrorImpl;\n})();\nexport var UnsubscriptionError = UnsubscriptionErrorImpl;\n//# sourceMappingURL=UnsubscriptionError.js.map\n","/** PURE_IMPORTS_START _util_isArray,_util_isObject,_util_isFunction,_util_UnsubscriptionError PURE_IMPORTS_END */\nimport { isArray } from './util/isArray';\nimport { isObject } from './util/isObject';\nimport { isFunction } from './util/isFunction';\nimport { UnsubscriptionError } from './util/UnsubscriptionError';\nvar Subscription = /*@__PURE__*/ (function () {\n    function Subscription(unsubscribe) {\n        this.closed = false;\n        this._parentOrParents = null;\n        this._subscriptions = null;\n        if (unsubscribe) {\n            this._unsubscribe = unsubscribe;\n        }\n    }\n    Subscription.prototype.unsubscribe = function () {\n        var errors;\n        if (this.closed) {\n            return;\n        }\n        var _a = this, _parentOrParents = _a._parentOrParents, _unsubscribe = _a._unsubscribe, _subscriptions = _a._subscriptions;\n        this.closed = true;\n        this._parentOrParents = null;\n        this._subscriptions = null;\n        if (_parentOrParents instanceof Subscription) {\n            _parentOrParents.remove(this);\n        }\n        else if (_parentOrParents !== null) {\n            for (var index = 0; index < _parentOrParents.length; ++index) {\n                var parent_1 = _parentOrParents[index];\n                parent_1.remove(this);\n            }\n        }\n        if (isFunction(_unsubscribe)) {\n            try {\n                _unsubscribe.call(this);\n            }\n            catch (e) {\n                errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];\n            }\n        }\n        if (isArray(_subscriptions)) {\n            var index = -1;\n            var len = _subscriptions.length;\n            while (++index < len) {\n                var sub = _subscriptions[index];\n                if (isObject(sub)) {\n                    try {\n                        sub.unsubscribe();\n                    }\n                    catch (e) {\n                        errors = errors || [];\n                        if (e instanceof UnsubscriptionError) {\n                            errors = errors.concat(flattenUnsubscriptionErrors(e.errors));\n                        }\n                        else {\n                            errors.push(e);\n                        }\n                    }\n                }\n            }\n        }\n        if (errors) {\n            throw new UnsubscriptionError(errors);\n        }\n    };\n    Subscription.prototype.add = function (teardown) {\n        var subscription = teardown;\n        if (!teardown) {\n            return Subscription.EMPTY;\n        }\n        switch (typeof teardown) {\n            case 'function':\n                subscription = new Subscription(teardown);\n            case 'object':\n                if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {\n                    return subscription;\n                }\n                else if (this.closed) {\n                    subscription.unsubscribe();\n                    return subscription;\n                }\n                else if (!(subscription instanceof Subscription)) {\n                    var tmp = subscription;\n                    subscription = new Subscription();\n                    subscription._subscriptions = [tmp];\n                }\n                break;\n            default: {\n                throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');\n            }\n        }\n        var _parentOrParents = subscription._parentOrParents;\n        if (_parentOrParents === null) {\n            subscription._parentOrParents = this;\n        }\n        else if (_parentOrParents instanceof Subscription) {\n            if (_parentOrParents === this) {\n                return subscription;\n            }\n            subscription._parentOrParents = [_parentOrParents, this];\n        }\n        else if (_parentOrParents.indexOf(this) === -1) {\n            _parentOrParents.push(this);\n        }\n        else {\n            return subscription;\n        }\n        var subscriptions = this._subscriptions;\n        if (subscriptions === null) {\n            this._subscriptions = [subscription];\n        }\n        else {\n            subscriptions.push(subscription);\n        }\n        return subscription;\n    };\n    Subscription.prototype.remove = function (subscription) {\n        var subscriptions = this._subscriptions;\n        if (subscriptions) {\n            var subscriptionIndex = subscriptions.indexOf(subscription);\n            if (subscriptionIndex !== -1) {\n                subscriptions.splice(subscriptionIndex, 1);\n            }\n        }\n    };\n    Subscription.EMPTY = (function (empty) {\n        empty.closed = true;\n        return empty;\n    }(new Subscription()));\n    return Subscription;\n}());\nexport { Subscription };\nfunction flattenUnsubscriptionErrors(errors) {\n    return errors.reduce(function (errs, err) { return errs.concat((err instanceof UnsubscriptionError) ? err.errors : err); }, []);\n}\n//# sourceMappingURL=Subscription.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var rxSubscriber = /*@__PURE__*/ (function () {\n    return typeof Symbol === 'function'\n        ? /*@__PURE__*/ Symbol('rxSubscriber')\n        : '@@rxSubscriber_' + /*@__PURE__*/ Math.random();\n})();\nexport var $$rxSubscriber = rxSubscriber;\n//# sourceMappingURL=rxSubscriber.js.map\n","/** PURE_IMPORTS_START tslib,_util_isFunction,_Observer,_Subscription,_internal_symbol_rxSubscriber,_config,_util_hostReportError PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { isFunction } from './util/isFunction';\nimport { empty as emptyObserver } from './Observer';\nimport { Subscription } from './Subscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\nimport { config } from './config';\nimport { hostReportError } from './util/hostReportError';\nvar Subscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Subscriber, _super);\n    function Subscriber(destinationOrNext, error, complete) {\n        var _this = _super.call(this) || this;\n        _this.syncErrorValue = null;\n        _this.syncErrorThrown = false;\n        _this.syncErrorThrowable = false;\n        _this.isStopped = false;\n        switch (arguments.length) {\n            case 0:\n                _this.destination = emptyObserver;\n                break;\n            case 1:\n                if (!destinationOrNext) {\n                    _this.destination = emptyObserver;\n                    break;\n                }\n                if (typeof destinationOrNext === 'object') {\n                    if (destinationOrNext instanceof Subscriber) {\n                        _this.syncErrorThrowable = destinationOrNext.syncErrorThrowable;\n                        _this.destination = destinationOrNext;\n                        destinationOrNext.add(_this);\n                    }\n                    else {\n                        _this.syncErrorThrowable = true;\n                        _this.destination = new SafeSubscriber(_this, destinationOrNext);\n                    }\n                    break;\n                }\n            default:\n                _this.syncErrorThrowable = true;\n                _this.destination = new SafeSubscriber(_this, destinationOrNext, error, complete);\n                break;\n        }\n        return _this;\n    }\n    Subscriber.prototype[rxSubscriberSymbol] = function () { return this; };\n    Subscriber.create = function (next, error, complete) {\n        var subscriber = new Subscriber(next, error, complete);\n        subscriber.syncErrorThrowable = false;\n        return subscriber;\n    };\n    Subscriber.prototype.next = function (value) {\n        if (!this.isStopped) {\n            this._next(value);\n        }\n    };\n    Subscriber.prototype.error = function (err) {\n        if (!this.isStopped) {\n            this.isStopped = true;\n            this._error(err);\n        }\n    };\n    Subscriber.prototype.complete = function () {\n        if (!this.isStopped) {\n            this.isStopped = true;\n            this._complete();\n        }\n    };\n    Subscriber.prototype.unsubscribe = function () {\n        if (this.closed) {\n            return;\n        }\n        this.isStopped = true;\n        _super.prototype.unsubscribe.call(this);\n    };\n    Subscriber.prototype._next = function (value) {\n        this.destination.next(value);\n    };\n    Subscriber.prototype._error = function (err) {\n        this.destination.error(err);\n        this.unsubscribe();\n    };\n    Subscriber.prototype._complete = function () {\n        this.destination.complete();\n        this.unsubscribe();\n    };\n    Subscriber.prototype._unsubscribeAndRecycle = function () {\n        var _parentOrParents = this._parentOrParents;\n        this._parentOrParents = null;\n        this.unsubscribe();\n        this.closed = false;\n        this.isStopped = false;\n        this._parentOrParents = _parentOrParents;\n        return this;\n    };\n    return Subscriber;\n}(Subscription));\nexport { Subscriber };\nvar SafeSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SafeSubscriber, _super);\n    function SafeSubscriber(_parentSubscriber, observerOrNext, error, complete) {\n        var _this = _super.call(this) || this;\n        _this._parentSubscriber = _parentSubscriber;\n        var next;\n        var context = _this;\n        if (isFunction(observerOrNext)) {\n            next = observerOrNext;\n        }\n        else if (observerOrNext) {\n            next = observerOrNext.next;\n            error = observerOrNext.error;\n            complete = observerOrNext.complete;\n            if (observerOrNext !== emptyObserver) {\n                context = Object.create(observerOrNext);\n                if (isFunction(context.unsubscribe)) {\n                    _this.add(context.unsubscribe.bind(context));\n                }\n                context.unsubscribe = _this.unsubscribe.bind(_this);\n            }\n        }\n        _this._context = context;\n        _this._next = next;\n        _this._error = error;\n        _this._complete = complete;\n        return _this;\n    }\n    SafeSubscriber.prototype.next = function (value) {\n        if (!this.isStopped && this._next) {\n            var _parentSubscriber = this._parentSubscriber;\n            if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                this.__tryOrUnsub(this._next, value);\n            }\n            else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.error = function (err) {\n        if (!this.isStopped) {\n            var _parentSubscriber = this._parentSubscriber;\n            var useDeprecatedSynchronousErrorHandling = config.useDeprecatedSynchronousErrorHandling;\n            if (this._error) {\n                if (!useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                    this.__tryOrUnsub(this._error, err);\n                    this.unsubscribe();\n                }\n                else {\n                    this.__tryOrSetError(_parentSubscriber, this._error, err);\n                    this.unsubscribe();\n                }\n            }\n            else if (!_parentSubscriber.syncErrorThrowable) {\n                this.unsubscribe();\n                if (useDeprecatedSynchronousErrorHandling) {\n                    throw err;\n                }\n                hostReportError(err);\n            }\n            else {\n                if (useDeprecatedSynchronousErrorHandling) {\n                    _parentSubscriber.syncErrorValue = err;\n                    _parentSubscriber.syncErrorThrown = true;\n                }\n                else {\n                    hostReportError(err);\n                }\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.complete = function () {\n        var _this = this;\n        if (!this.isStopped) {\n            var _parentSubscriber = this._parentSubscriber;\n            if (this._complete) {\n                var wrappedComplete = function () { return _this._complete.call(_this._context); };\n                if (!config.useDeprecatedSynchronousErrorHandling || !_parentSubscriber.syncErrorThrowable) {\n                    this.__tryOrUnsub(wrappedComplete);\n                    this.unsubscribe();\n                }\n                else {\n                    this.__tryOrSetError(_parentSubscriber, wrappedComplete);\n                    this.unsubscribe();\n                }\n            }\n            else {\n                this.unsubscribe();\n            }\n        }\n    };\n    SafeSubscriber.prototype.__tryOrUnsub = function (fn, value) {\n        try {\n            fn.call(this._context, value);\n        }\n        catch (err) {\n            this.unsubscribe();\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                throw err;\n            }\n            else {\n                hostReportError(err);\n            }\n        }\n    };\n    SafeSubscriber.prototype.__tryOrSetError = function (parent, fn, value) {\n        if (!config.useDeprecatedSynchronousErrorHandling) {\n            throw new Error('bad call');\n        }\n        try {\n            fn.call(this._context, value);\n        }\n        catch (err) {\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                parent.syncErrorValue = err;\n                parent.syncErrorThrown = true;\n                return true;\n            }\n            else {\n                hostReportError(err);\n                return true;\n            }\n        }\n        return false;\n    };\n    SafeSubscriber.prototype._unsubscribe = function () {\n        var _parentSubscriber = this._parentSubscriber;\n        this._context = null;\n        this._parentSubscriber = null;\n        _parentSubscriber.unsubscribe();\n    };\n    return SafeSubscriber;\n}(Subscriber));\nexport { SafeSubscriber };\n//# sourceMappingURL=Subscriber.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var observable = /*@__PURE__*/ (function () { return typeof Symbol === 'function' && Symbol.observable || '@@observable'; })();\n//# sourceMappingURL=observable.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function noop() { }\n//# sourceMappingURL=noop.js.map\n","/** PURE_IMPORTS_START _noop PURE_IMPORTS_END */\nimport { noop } from './noop';\nexport function pipe() {\n    var fns = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        fns[_i] = arguments[_i];\n    }\n    return pipeFromArray(fns);\n}\nexport function pipeFromArray(fns) {\n    if (!fns) {\n        return noop;\n    }\n    if (fns.length === 1) {\n        return fns[0];\n    }\n    return function piped(input) {\n        return fns.reduce(function (prev, fn) { return fn(prev); }, input);\n    };\n}\n//# sourceMappingURL=pipe.js.map\n","/** PURE_IMPORTS_START _util_canReportError,_util_toSubscriber,_symbol_observable,_util_pipe,_config PURE_IMPORTS_END */\nimport { canReportError } from './util/canReportError';\nimport { toSubscriber } from './util/toSubscriber';\nimport { observable as Symbol_observable } from './symbol/observable';\nimport { pipeFromArray } from './util/pipe';\nimport { config } from './config';\nvar Observable = /*@__PURE__*/ (function () {\n    function Observable(subscribe) {\n        this._isScalar = false;\n        if (subscribe) {\n            this._subscribe = subscribe;\n        }\n    }\n    Observable.prototype.lift = function (operator) {\n        var observable = new Observable();\n        observable.source = this;\n        observable.operator = operator;\n        return observable;\n    };\n    Observable.prototype.subscribe = function (observerOrNext, error, complete) {\n        var operator = this.operator;\n        var sink = toSubscriber(observerOrNext, error, complete);\n        if (operator) {\n            sink.add(operator.call(sink, this.source));\n        }\n        else {\n            sink.add(this.source || (config.useDeprecatedSynchronousErrorHandling && !sink.syncErrorThrowable) ?\n                this._subscribe(sink) :\n                this._trySubscribe(sink));\n        }\n        if (config.useDeprecatedSynchronousErrorHandling) {\n            if (sink.syncErrorThrowable) {\n                sink.syncErrorThrowable = false;\n                if (sink.syncErrorThrown) {\n                    throw sink.syncErrorValue;\n                }\n            }\n        }\n        return sink;\n    };\n    Observable.prototype._trySubscribe = function (sink) {\n        try {\n            return this._subscribe(sink);\n        }\n        catch (err) {\n            if (config.useDeprecatedSynchronousErrorHandling) {\n                sink.syncErrorThrown = true;\n                sink.syncErrorValue = err;\n            }\n            if (canReportError(sink)) {\n                sink.error(err);\n            }\n            else {\n                console.warn(err);\n            }\n        }\n    };\n    Observable.prototype.forEach = function (next, promiseCtor) {\n        var _this = this;\n        promiseCtor = getPromiseCtor(promiseCtor);\n        return new promiseCtor(function (resolve, reject) {\n            var subscription;\n            subscription = _this.subscribe(function (value) {\n                try {\n                    next(value);\n                }\n                catch (err) {\n                    reject(err);\n                    if (subscription) {\n                        subscription.unsubscribe();\n                    }\n                }\n            }, reject, resolve);\n        });\n    };\n    Observable.prototype._subscribe = function (subscriber) {\n        var source = this.source;\n        return source && source.subscribe(subscriber);\n    };\n    Observable.prototype[Symbol_observable] = function () {\n        return this;\n    };\n    Observable.prototype.pipe = function () {\n        var operations = [];\n        for (var _i = 0; _i < arguments.length; _i++) {\n            operations[_i] = arguments[_i];\n        }\n        if (operations.length === 0) {\n            return this;\n        }\n        return pipeFromArray(operations)(this);\n    };\n    Observable.prototype.toPromise = function (promiseCtor) {\n        var _this = this;\n        promiseCtor = getPromiseCtor(promiseCtor);\n        return new promiseCtor(function (resolve, reject) {\n            var value;\n            _this.subscribe(function (x) { return value = x; }, function (err) { return reject(err); }, function () { return resolve(value); });\n        });\n    };\n    Observable.create = function (subscribe) {\n        return new Observable(subscribe);\n    };\n    return Observable;\n}());\nexport { Observable };\nfunction getPromiseCtor(promiseCtor) {\n    if (!promiseCtor) {\n        promiseCtor = config.Promise || Promise;\n    }\n    if (!promiseCtor) {\n        throw new Error('no Promise impl found');\n    }\n    return promiseCtor;\n}\n//# sourceMappingURL=Observable.js.map\n","/** PURE_IMPORTS_START _Subscriber,_symbol_rxSubscriber,_Observer PURE_IMPORTS_END */\nimport { Subscriber } from '../Subscriber';\nimport { rxSubscriber as rxSubscriberSymbol } from '../symbol/rxSubscriber';\nimport { empty as emptyObserver } from '../Observer';\nexport function toSubscriber(nextOrObserver, error, complete) {\n    if (nextOrObserver) {\n        if (nextOrObserver instanceof Subscriber) {\n            return nextOrObserver;\n        }\n        if (nextOrObserver[rxSubscriberSymbol]) {\n            return nextOrObserver[rxSubscriberSymbol]();\n        }\n    }\n    if (!nextOrObserver && !error && !complete) {\n        return new Subscriber(emptyObserver);\n    }\n    return new Subscriber(nextOrObserver, error, complete);\n}\n//# sourceMappingURL=toSubscriber.js.map\n","/** PURE_IMPORTS_START _Subscriber PURE_IMPORTS_END */\nimport { Subscriber } from '../Subscriber';\nexport function canReportError(observer) {\n    while (observer) {\n        var _a = observer, closed_1 = _a.closed, destination = _a.destination, isStopped = _a.isStopped;\n        if (closed_1 || isStopped) {\n            return false;\n        }\n        else if (destination && destination instanceof Subscriber) {\n            observer = destination;\n        }\n        else {\n            observer = null;\n        }\n    }\n    return true;\n}\n//# sourceMappingURL=canReportError.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar ObjectUnsubscribedErrorImpl = /*@__PURE__*/ (function () {\n    function ObjectUnsubscribedErrorImpl() {\n        Error.call(this);\n        this.message = 'object unsubscribed';\n        this.name = 'ObjectUnsubscribedError';\n        return this;\n    }\n    ObjectUnsubscribedErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return ObjectUnsubscribedErrorImpl;\n})();\nexport var ObjectUnsubscribedError = ObjectUnsubscribedErrorImpl;\n//# sourceMappingURL=ObjectUnsubscribedError.js.map\n","/** PURE_IMPORTS_START tslib,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscription } from './Subscription';\nvar SubjectSubscription = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SubjectSubscription, _super);\n    function SubjectSubscription(subject, subscriber) {\n        var _this = _super.call(this) || this;\n        _this.subject = subject;\n        _this.subscriber = subscriber;\n        _this.closed = false;\n        return _this;\n    }\n    SubjectSubscription.prototype.unsubscribe = function () {\n        if (this.closed) {\n            return;\n        }\n        this.closed = true;\n        var subject = this.subject;\n        var observers = subject.observers;\n        this.subject = null;\n        if (!observers || observers.length === 0 || subject.isStopped || subject.closed) {\n            return;\n        }\n        var subscriberIndex = observers.indexOf(this.subscriber);\n        if (subscriberIndex !== -1) {\n            observers.splice(subscriberIndex, 1);\n        }\n    };\n    return SubjectSubscription;\n}(Subscription));\nexport { SubjectSubscription };\n//# sourceMappingURL=SubjectSubscription.js.map\n","/** PURE_IMPORTS_START tslib,_Observable,_Subscriber,_Subscription,_util_ObjectUnsubscribedError,_SubjectSubscription,_internal_symbol_rxSubscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Observable } from './Observable';\nimport { Subscriber } from './Subscriber';\nimport { Subscription } from './Subscription';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nimport { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';\nvar SubjectSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SubjectSubscriber, _super);\n    function SubjectSubscriber(destination) {\n        var _this = _super.call(this, destination) || this;\n        _this.destination = destination;\n        return _this;\n    }\n    return SubjectSubscriber;\n}(Subscriber));\nexport { SubjectSubscriber };\nvar Subject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Subject, _super);\n    function Subject() {\n        var _this = _super.call(this) || this;\n        _this.observers = [];\n        _this.closed = false;\n        _this.isStopped = false;\n        _this.hasError = false;\n        _this.thrownError = null;\n        return _this;\n    }\n    Subject.prototype[rxSubscriberSymbol] = function () {\n        return new SubjectSubscriber(this);\n    };\n    Subject.prototype.lift = function (operator) {\n        var subject = new AnonymousSubject(this, this);\n        subject.operator = operator;\n        return subject;\n    };\n    Subject.prototype.next = function (value) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        if (!this.isStopped) {\n            var observers = this.observers;\n            var len = observers.length;\n            var copy = observers.slice();\n            for (var i = 0; i < len; i++) {\n                copy[i].next(value);\n            }\n        }\n    };\n    Subject.prototype.error = function (err) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        this.hasError = true;\n        this.thrownError = err;\n        this.isStopped = true;\n        var observers = this.observers;\n        var len = observers.length;\n        var copy = observers.slice();\n        for (var i = 0; i < len; i++) {\n            copy[i].error(err);\n        }\n        this.observers.length = 0;\n    };\n    Subject.prototype.complete = function () {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        this.isStopped = true;\n        var observers = this.observers;\n        var len = observers.length;\n        var copy = observers.slice();\n        for (var i = 0; i < len; i++) {\n            copy[i].complete();\n        }\n        this.observers.length = 0;\n    };\n    Subject.prototype.unsubscribe = function () {\n        this.isStopped = true;\n        this.closed = true;\n        this.observers = null;\n    };\n    Subject.prototype._trySubscribe = function (subscriber) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else {\n            return _super.prototype._trySubscribe.call(this, subscriber);\n        }\n    };\n    Subject.prototype._subscribe = function (subscriber) {\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else if (this.hasError) {\n            subscriber.error(this.thrownError);\n            return Subscription.EMPTY;\n        }\n        else if (this.isStopped) {\n            subscriber.complete();\n            return Subscription.EMPTY;\n        }\n        else {\n            this.observers.push(subscriber);\n            return new SubjectSubscription(this, subscriber);\n        }\n    };\n    Subject.prototype.asObservable = function () {\n        var observable = new Observable();\n        observable.source = this;\n        return observable;\n    };\n    Subject.create = function (destination, source) {\n        return new AnonymousSubject(destination, source);\n    };\n    return Subject;\n}(Observable));\nexport { Subject };\nvar AnonymousSubject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnonymousSubject, _super);\n    function AnonymousSubject(destination, source) {\n        var _this = _super.call(this) || this;\n        _this.destination = destination;\n        _this.source = source;\n        return _this;\n    }\n    AnonymousSubject.prototype.next = function (value) {\n        var destination = this.destination;\n        if (destination && destination.next) {\n            destination.next(value);\n        }\n    };\n    AnonymousSubject.prototype.error = function (err) {\n        var destination = this.destination;\n        if (destination && destination.error) {\n            this.destination.error(err);\n        }\n    };\n    AnonymousSubject.prototype.complete = function () {\n        var destination = this.destination;\n        if (destination && destination.complete) {\n            this.destination.complete();\n        }\n    };\n    AnonymousSubject.prototype._subscribe = function (subscriber) {\n        var source = this.source;\n        if (source) {\n            return this.source.subscribe(subscriber);\n        }\n        else {\n            return Subscription.EMPTY;\n        }\n    };\n    return AnonymousSubject;\n}(Subject));\nexport { AnonymousSubject };\n//# sourceMappingURL=Subject.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isScheduler(value) {\n    return value && typeof value.schedule === 'function';\n}\n//# sourceMappingURL=isScheduler.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var subscribeToArray = function (array) {\n    return function (subscriber) {\n        for (var i = 0, len = array.length; i < len && !subscriber.closed; i++) {\n            subscriber.next(array[i]);\n        }\n        subscriber.complete();\n    };\n};\n//# sourceMappingURL=subscribeToArray.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nexport function scheduleArray(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        var i = 0;\n        sub.add(scheduler.schedule(function () {\n            if (i === input.length) {\n                subscriber.complete();\n                return;\n            }\n            subscriber.next(input[i++]);\n            if (!subscriber.closed) {\n                sub.add(this.schedule());\n            }\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleArray.js.map\n","/** PURE_IMPORTS_START _Observable,_util_subscribeToArray,_scheduled_scheduleArray PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { subscribeToArray } from '../util/subscribeToArray';\nimport { scheduleArray } from '../scheduled/scheduleArray';\nexport function fromArray(input, scheduler) {\n    if (!scheduler) {\n        return new Observable(subscribeToArray(input));\n    }\n    else {\n        return scheduleArray(input, scheduler);\n    }\n}\n//# sourceMappingURL=fromArray.js.map\n","/** PURE_IMPORTS_START _util_isScheduler,_fromArray,_scheduled_scheduleArray PURE_IMPORTS_END */\nimport { isScheduler } from '../util/isScheduler';\nimport { fromArray } from './fromArray';\nimport { scheduleArray } from '../scheduled/scheduleArray';\nexport function of() {\n    var args = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        args[_i] = arguments[_i];\n    }\n    var scheduler = args[args.length - 1];\n    if (isScheduler(scheduler)) {\n        args.pop();\n        return scheduleArray(args, scheduler);\n    }\n    else {\n        return fromArray(args);\n    }\n}\n//# sourceMappingURL=of.js.map\n","/** PURE_IMPORTS_START _Observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nexport var EMPTY = /*@__PURE__*/ new Observable(function (subscriber) { return subscriber.complete(); });\nexport function empty(scheduler) {\n    return scheduler ? emptyScheduled(scheduler) : EMPTY;\n}\nfunction emptyScheduled(scheduler) {\n    return new Observable(function (subscriber) { return scheduler.schedule(function () { return subscriber.complete(); }); });\n}\n//# sourceMappingURL=empty.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function map(project, thisArg) {\n    return function mapOperation(source) {\n        if (typeof project !== 'function') {\n            throw new TypeError('argument is not a function. Are you looking for `mapTo()`?');\n        }\n        return source.lift(new MapOperator(project, thisArg));\n    };\n}\nvar MapOperator = /*@__PURE__*/ (function () {\n    function MapOperator(project, thisArg) {\n        this.project = project;\n        this.thisArg = thisArg;\n    }\n    MapOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg));\n    };\n    return MapOperator;\n}());\nexport { MapOperator };\nvar MapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MapSubscriber, _super);\n    function MapSubscriber(destination, project, thisArg) {\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.count = 0;\n        _this.thisArg = thisArg || _this;\n        return _this;\n    }\n    MapSubscriber.prototype._next = function (value) {\n        var result;\n        try {\n            result = this.project.call(this.thisArg, value, this.count++);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return MapSubscriber;\n}(Subscriber));\n//# sourceMappingURL=map.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function getSymbolIterator() {\n    if (typeof Symbol !== 'function' || !Symbol.iterator) {\n        return '@@iterator';\n    }\n    return Symbol.iterator;\n}\nexport var iterator = /*@__PURE__*/ getSymbolIterator();\nexport var $$iterator = iterator;\n//# sourceMappingURL=iterator.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport var isArrayLike = (function (x) { return x && typeof x.length === 'number' && typeof x !== 'function'; });\n//# sourceMappingURL=isArrayLike.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isPromise(value) {\n    return !!value && typeof value.subscribe !== 'function' && typeof value.then === 'function';\n}\n//# sourceMappingURL=isPromise.js.map\n","/** PURE_IMPORTS_START _subscribeToArray,_subscribeToPromise,_subscribeToIterable,_subscribeToObservable,_isArrayLike,_isPromise,_isObject,_symbol_iterator,_symbol_observable PURE_IMPORTS_END */\nimport { subscribeToArray } from './subscribeToArray';\nimport { subscribeToPromise } from './subscribeToPromise';\nimport { subscribeToIterable } from './subscribeToIterable';\nimport { subscribeToObservable } from './subscribeToObservable';\nimport { isArrayLike } from './isArrayLike';\nimport { isPromise } from './isPromise';\nimport { isObject } from './isObject';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport var subscribeTo = function (result) {\n    if (!!result && typeof result[Symbol_observable] === 'function') {\n        return subscribeToObservable(result);\n    }\n    else if (isArrayLike(result)) {\n        return subscribeToArray(result);\n    }\n    else if (isPromise(result)) {\n        return subscribeToPromise(result);\n    }\n    else if (!!result && typeof result[Symbol_iterator] === 'function') {\n        return subscribeToIterable(result);\n    }\n    else {\n        var value = isObject(result) ? 'an invalid object' : \"'\" + result + \"'\";\n        var msg = \"You provided \" + value + \" where a stream was expected.\"\n            + ' You can provide an Observable, Promise, Array, or Iterable.';\n        throw new TypeError(msg);\n    }\n};\n//# sourceMappingURL=subscribeTo.js.map\n","/** PURE_IMPORTS_START _symbol_observable PURE_IMPORTS_END */\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport var subscribeToObservable = function (obj) {\n    return function (subscriber) {\n        var obs = obj[Symbol_observable]();\n        if (typeof obs.subscribe !== 'function') {\n            throw new TypeError('Provided object does not correctly implement Symbol.observable');\n        }\n        else {\n            return obs.subscribe(subscriber);\n        }\n    };\n};\n//# sourceMappingURL=subscribeToObservable.js.map\n","/** PURE_IMPORTS_START _hostReportError PURE_IMPORTS_END */\nimport { hostReportError } from './hostReportError';\nexport var subscribeToPromise = function (promise) {\n    return function (subscriber) {\n        promise.then(function (value) {\n            if (!subscriber.closed) {\n                subscriber.next(value);\n                subscriber.complete();\n            }\n        }, function (err) { return subscriber.error(err); })\n            .then(null, hostReportError);\n        return subscriber;\n    };\n};\n//# sourceMappingURL=subscribeToPromise.js.map\n","/** PURE_IMPORTS_START _symbol_iterator PURE_IMPORTS_END */\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport var subscribeToIterable = function (iterable) {\n    return function (subscriber) {\n        var iterator = iterable[Symbol_iterator]();\n        do {\n            var item = iterator.next();\n            if (item.done) {\n                subscriber.complete();\n                break;\n            }\n            subscriber.next(item.value);\n            if (subscriber.closed) {\n                break;\n            }\n        } while (true);\n        if (typeof iterator.return === 'function') {\n            subscriber.add(function () {\n                if (iterator.return) {\n                    iterator.return();\n                }\n            });\n        }\n        return subscriber;\n    };\n};\n//# sourceMappingURL=subscribeToIterable.js.map\n","/** PURE_IMPORTS_START _scheduleObservable,_schedulePromise,_scheduleArray,_scheduleIterable,_util_isInteropObservable,_util_isPromise,_util_isArrayLike,_util_isIterable PURE_IMPORTS_END */\nimport { scheduleObservable } from './scheduleObservable';\nimport { schedulePromise } from './schedulePromise';\nimport { scheduleArray } from './scheduleArray';\nimport { scheduleIterable } from './scheduleIterable';\nimport { isInteropObservable } from '../util/isInteropObservable';\nimport { isPromise } from '../util/isPromise';\nimport { isArrayLike } from '../util/isArrayLike';\nimport { isIterable } from '../util/isIterable';\nexport function scheduled(input, scheduler) {\n    if (input != null) {\n        if (isInteropObservable(input)) {\n            return scheduleObservable(input, scheduler);\n        }\n        else if (isPromise(input)) {\n            return schedulePromise(input, scheduler);\n        }\n        else if (isArrayLike(input)) {\n            return scheduleArray(input, scheduler);\n        }\n        else if (isIterable(input) || typeof input === 'string') {\n            return scheduleIterable(input, scheduler);\n        }\n    }\n    throw new TypeError((input !== null && typeof input || input) + ' is not observable');\n}\n//# sourceMappingURL=scheduled.js.map\n","/** PURE_IMPORTS_START _symbol_observable PURE_IMPORTS_END */\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport function isInteropObservable(input) {\n    return input && typeof input[Symbol_observable] === 'function';\n}\n//# sourceMappingURL=isInteropObservable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription,_symbol_observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nimport { observable as Symbol_observable } from '../symbol/observable';\nexport function scheduleObservable(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        sub.add(scheduler.schedule(function () {\n            var observable = input[Symbol_observable]();\n            sub.add(observable.subscribe({\n                next: function (value) { sub.add(scheduler.schedule(function () { return subscriber.next(value); })); },\n                error: function (err) { sub.add(scheduler.schedule(function () { return subscriber.error(err); })); },\n                complete: function () { sub.add(scheduler.schedule(function () { return subscriber.complete(); })); },\n            }));\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleObservable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nexport function schedulePromise(input, scheduler) {\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        sub.add(scheduler.schedule(function () {\n            return input.then(function (value) {\n                sub.add(scheduler.schedule(function () {\n                    subscriber.next(value);\n                    sub.add(scheduler.schedule(function () { return subscriber.complete(); }));\n                }));\n            }, function (err) {\n                sub.add(scheduler.schedule(function () { return subscriber.error(err); }));\n            });\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=schedulePromise.js.map\n","/** PURE_IMPORTS_START _symbol_iterator PURE_IMPORTS_END */\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport function isIterable(input) {\n    return input && typeof input[Symbol_iterator] === 'function';\n}\n//# sourceMappingURL=isIterable.js.map\n","/** PURE_IMPORTS_START _Observable,_Subscription,_symbol_iterator PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { Subscription } from '../Subscription';\nimport { iterator as Symbol_iterator } from '../symbol/iterator';\nexport function scheduleIterable(input, scheduler) {\n    if (!input) {\n        throw new Error('Iterable cannot be null');\n    }\n    return new Observable(function (subscriber) {\n        var sub = new Subscription();\n        var iterator;\n        sub.add(function () {\n            if (iterator && typeof iterator.return === 'function') {\n                iterator.return();\n            }\n        });\n        sub.add(scheduler.schedule(function () {\n            iterator = input[Symbol_iterator]();\n            sub.add(scheduler.schedule(function () {\n                if (subscriber.closed) {\n                    return;\n                }\n                var value;\n                var done;\n                try {\n                    var result = iterator.next();\n                    value = result.value;\n                    done = result.done;\n                }\n                catch (err) {\n                    subscriber.error(err);\n                    return;\n                }\n                if (done) {\n                    subscriber.complete();\n                }\n                else {\n                    subscriber.next(value);\n                    this.schedule();\n                }\n            }));\n        }));\n        return sub;\n    });\n}\n//# sourceMappingURL=scheduleIterable.js.map\n","/** PURE_IMPORTS_START _Observable,_util_subscribeTo,_scheduled_scheduled PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { subscribeTo } from '../util/subscribeTo';\nimport { scheduled } from '../scheduled/scheduled';\nexport function from(input, scheduler) {\n    if (!scheduler) {\n        if (input instanceof Observable) {\n            return input;\n        }\n        return new Observable(subscribeTo(input));\n    }\n    else {\n        return scheduled(input, scheduler);\n    }\n}\n//# sourceMappingURL=from.js.map\n","/** PURE_IMPORTS_START _Observable,_util_isArray,_operators_map,_util_isObject,_from PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isArray } from '../util/isArray';\nimport { map } from '../operators/map';\nimport { isObject } from '../util/isObject';\nimport { from } from './from';\nexport function forkJoin() {\n    var sources = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        sources[_i] = arguments[_i];\n    }\n    if (sources.length === 1) {\n        var first_1 = sources[0];\n        if (isArray(first_1)) {\n            return forkJoinInternal(first_1, null);\n        }\n        if (isObject(first_1) && Object.getPrototypeOf(first_1) === Object.prototype) {\n            var keys = Object.keys(first_1);\n            return forkJoinInternal(keys.map(function (key) { return first_1[key]; }), keys);\n        }\n    }\n    if (typeof sources[sources.length - 1] === 'function') {\n        var resultSelector_1 = sources.pop();\n        sources = (sources.length === 1 && isArray(sources[0])) ? sources[0] : sources;\n        return forkJoinInternal(sources, null).pipe(map(function (args) { return resultSelector_1.apply(void 0, args); }));\n    }\n    return forkJoinInternal(sources, null);\n}\nfunction forkJoinInternal(sources, keys) {\n    return new Observable(function (subscriber) {\n        var len = sources.length;\n        if (len === 0) {\n            subscriber.complete();\n            return;\n        }\n        var values = new Array(len);\n        var completed = 0;\n        var emitted = 0;\n        var _loop_1 = function (i) {\n            var source = from(sources[i]);\n            var hasValue = false;\n            subscriber.add(source.subscribe({\n                next: function (value) {\n                    if (!hasValue) {\n                        hasValue = true;\n                        emitted++;\n                    }\n                    values[i] = value;\n                },\n                error: function (err) { return subscriber.error(err); },\n                complete: function () {\n                    completed++;\n                    if (completed === len || !hasValue) {\n                        if (emitted === len) {\n                            subscriber.next(keys ?\n                                keys.reduce(function (result, key, i) { return (result[key] = values[i], result); }, {}) :\n                                values);\n                        }\n                        subscriber.complete();\n                    }\n                }\n            }));\n        };\n        for (var i = 0; i < len; i++) {\n            _loop_1(i);\n        }\n    });\n}\n//# sourceMappingURL=forkJoin.js.map\n","/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isArray } from '../util/isArray';\nimport { isFunction } from '../util/isFunction';\nimport { map } from '../operators/map';\nvar toString = /*@__PURE__*/ (function () { return Object.prototype.toString; })();\nexport function fromEvent(target, eventName, options, resultSelector) {\n    if (isFunction(options)) {\n        resultSelector = options;\n        options = undefined;\n    }\n    if (resultSelector) {\n        return fromEvent(target, eventName, options).pipe(map(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));\n    }\n    return new Observable(function (subscriber) {\n        function handler(e) {\n            if (arguments.length > 1) {\n                subscriber.next(Array.prototype.slice.call(arguments));\n            }\n            else {\n                subscriber.next(e);\n            }\n        }\n        setupSubscription(target, eventName, handler, subscriber, options);\n    });\n}\nfunction setupSubscription(sourceObj, eventName, handler, subscriber, options) {\n    var unsubscribe;\n    if (isEventTarget(sourceObj)) {\n        var source_1 = sourceObj;\n        sourceObj.addEventListener(eventName, handler, options);\n        unsubscribe = function () { return source_1.removeEventListener(eventName, handler, options); };\n    }\n    else if (isJQueryStyleEventEmitter(sourceObj)) {\n        var source_2 = sourceObj;\n        sourceObj.on(eventName, handler);\n        unsubscribe = function () { return source_2.off(eventName, handler); };\n    }\n    else if (isNodeStyleEventEmitter(sourceObj)) {\n        var source_3 = sourceObj;\n        sourceObj.addListener(eventName, handler);\n        unsubscribe = function () { return source_3.removeListener(eventName, handler); };\n    }\n    else if (sourceObj && sourceObj.length) {\n        for (var i = 0, len = sourceObj.length; i < len; i++) {\n            setupSubscription(sourceObj[i], eventName, handler, subscriber, options);\n        }\n    }\n    else {\n        throw new TypeError('Invalid event target');\n    }\n    subscriber.add(unsubscribe);\n}\nfunction isNodeStyleEventEmitter(sourceObj) {\n    return sourceObj && typeof sourceObj.addListener === 'function' && typeof sourceObj.removeListener === 'function';\n}\nfunction isJQueryStyleEventEmitter(sourceObj) {\n    return sourceObj && typeof sourceObj.on === 'function' && typeof sourceObj.off === 'function';\n}\nfunction isEventTarget(sourceObj) {\n    return sourceObj && typeof sourceObj.addEventListener === 'function' && typeof sourceObj.removeEventListener === 'function';\n}\n//# sourceMappingURL=fromEvent.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from './Subscriber';\nvar InnerSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(InnerSubscriber, _super);\n    function InnerSubscriber(parent, outerValue, outerIndex) {\n        var _this = _super.call(this) || this;\n        _this.parent = parent;\n        _this.outerValue = outerValue;\n        _this.outerIndex = outerIndex;\n        _this.index = 0;\n        return _this;\n    }\n    InnerSubscriber.prototype._next = function (value) {\n        this.parent.notifyNext(this.outerValue, value, this.outerIndex, this.index++, this);\n    };\n    InnerSubscriber.prototype._error = function (error) {\n        this.parent.notifyError(error, this);\n        this.unsubscribe();\n    };\n    InnerSubscriber.prototype._complete = function () {\n        this.parent.notifyComplete(this);\n        this.unsubscribe();\n    };\n    return InnerSubscriber;\n}(Subscriber));\nexport { InnerSubscriber };\n//# sourceMappingURL=InnerSubscriber.js.map\n","/** PURE_IMPORTS_START _InnerSubscriber,_subscribeTo,_Observable PURE_IMPORTS_END */\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { subscribeTo } from './subscribeTo';\nimport { Observable } from '../Observable';\nexport function subscribeToResult(outerSubscriber, result, outerValue, outerIndex, destination) {\n    if (destination === void 0) {\n        destination = new InnerSubscriber(outerSubscriber, outerValue, outerIndex);\n    }\n    if (destination.closed) {\n        return undefined;\n    }\n    if (result instanceof Observable) {\n        return result.subscribe(destination);\n    }\n    return subscribeTo(result)(destination);\n}\n//# sourceMappingURL=subscribeToResult.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from './Subscriber';\nvar OuterSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(OuterSubscriber, _super);\n    function OuterSubscriber() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    OuterSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    OuterSubscriber.prototype.notifyError = function (error, innerSub) {\n        this.destination.error(error);\n    };\n    OuterSubscriber.prototype.notifyComplete = function (innerSub) {\n        this.destination.complete();\n    };\n    return OuterSubscriber;\n}(Subscriber));\nexport { OuterSubscriber };\n//# sourceMappingURL=OuterSubscriber.js.map\n","/** PURE_IMPORTS_START tslib,_util_subscribeToResult,_OuterSubscriber,_InnerSubscriber,_map,_observable_from PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { map } from './map';\nimport { from } from '../observable/from';\nexport function mergeMap(project, resultSelector, concurrent) {\n    if (concurrent === void 0) {\n        concurrent = Number.POSITIVE_INFINITY;\n    }\n    if (typeof resultSelector === 'function') {\n        return function (source) { return source.pipe(mergeMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); }, concurrent)); };\n    }\n    else if (typeof resultSelector === 'number') {\n        concurrent = resultSelector;\n    }\n    return function (source) { return source.lift(new MergeMapOperator(project, concurrent)); };\n}\nvar MergeMapOperator = /*@__PURE__*/ (function () {\n    function MergeMapOperator(project, concurrent) {\n        if (concurrent === void 0) {\n            concurrent = Number.POSITIVE_INFINITY;\n        }\n        this.project = project;\n        this.concurrent = concurrent;\n    }\n    MergeMapOperator.prototype.call = function (observer, source) {\n        return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));\n    };\n    return MergeMapOperator;\n}());\nexport { MergeMapOperator };\nvar MergeMapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MergeMapSubscriber, _super);\n    function MergeMapSubscriber(destination, project, concurrent) {\n        if (concurrent === void 0) {\n            concurrent = Number.POSITIVE_INFINITY;\n        }\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.concurrent = concurrent;\n        _this.hasCompleted = false;\n        _this.buffer = [];\n        _this.active = 0;\n        _this.index = 0;\n        return _this;\n    }\n    MergeMapSubscriber.prototype._next = function (value) {\n        if (this.active < this.concurrent) {\n            this._tryNext(value);\n        }\n        else {\n            this.buffer.push(value);\n        }\n    };\n    MergeMapSubscriber.prototype._tryNext = function (value) {\n        var result;\n        var index = this.index++;\n        try {\n            result = this.project(value, index);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.active++;\n        this._innerSub(result, value, index);\n    };\n    MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {\n        var innerSubscriber = new InnerSubscriber(this, undefined, undefined);\n        var destination = this.destination;\n        destination.add(innerSubscriber);\n        subscribeToResult(this, ish, value, index, innerSubscriber);\n    };\n    MergeMapSubscriber.prototype._complete = function () {\n        this.hasCompleted = true;\n        if (this.active === 0 && this.buffer.length === 0) {\n            this.destination.complete();\n        }\n        this.unsubscribe();\n    };\n    MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {\n        var buffer = this.buffer;\n        this.remove(innerSub);\n        this.active--;\n        if (buffer.length > 0) {\n            this._next(buffer.shift());\n        }\n        else if (this.active === 0 && this.hasCompleted) {\n            this.destination.complete();\n        }\n    };\n    return MergeMapSubscriber;\n}(OuterSubscriber));\nexport { MergeMapSubscriber };\n//# sourceMappingURL=mergeMap.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function identity(x) {\n    return x;\n}\n//# sourceMappingURL=identity.js.map\n","/** PURE_IMPORTS_START _mergeMap,_util_identity PURE_IMPORTS_END */\nimport { mergeMap } from './mergeMap';\nimport { identity } from '../util/identity';\nexport function mergeAll(concurrent) {\n    if (concurrent === void 0) {\n        concurrent = Number.POSITIVE_INFINITY;\n    }\n    return mergeMap(identity, concurrent);\n}\n//# sourceMappingURL=mergeAll.js.map\n","/** PURE_IMPORTS_START _Observable,_util_isScheduler,_operators_mergeAll,_fromArray PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isScheduler } from '../util/isScheduler';\nimport { mergeAll } from '../operators/mergeAll';\nimport { fromArray } from './fromArray';\nexport function merge() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    var concurrent = Number.POSITIVE_INFINITY;\n    var scheduler = null;\n    var last = observables[observables.length - 1];\n    if (isScheduler(last)) {\n        scheduler = observables.pop();\n        if (observables.length > 1 && typeof observables[observables.length - 1] === 'number') {\n            concurrent = observables.pop();\n        }\n    }\n    else if (typeof last === 'number') {\n        concurrent = observables.pop();\n    }\n    if (scheduler === null && observables.length === 1 && observables[0] instanceof Observable) {\n        return observables[0];\n    }\n    return mergeAll(concurrent)(fromArray(observables, scheduler));\n}\n//# sourceMappingURL=merge.js.map\n","/** PURE_IMPORTS_START tslib,_.._util_root,_.._Observable,_.._Subscriber,_.._operators_map PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { root } from '../../util/root';\nimport { Observable } from '../../Observable';\nimport { Subscriber } from '../../Subscriber';\nimport { map } from '../../operators/map';\nfunction getCORSRequest() {\n    if (root.XMLHttpRequest) {\n        return new root.XMLHttpRequest();\n    }\n    else if (!!root.XDomainRequest) {\n        return new root.XDomainRequest();\n    }\n    else {\n        throw new Error('CORS is not supported by your browser');\n    }\n}\nfunction getXMLHttpRequest() {\n    if (root.XMLHttpRequest) {\n        return new root.XMLHttpRequest();\n    }\n    else {\n        var progId = void 0;\n        try {\n            var progIds = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];\n            for (var i = 0; i < 3; i++) {\n                try {\n                    progId = progIds[i];\n                    if (new root.ActiveXObject(progId)) {\n                        break;\n                    }\n                }\n                catch (e) {\n                }\n            }\n            return new root.ActiveXObject(progId);\n        }\n        catch (e) {\n            throw new Error('XMLHttpRequest is not supported by your browser');\n        }\n    }\n}\nexport function ajaxGet(url, headers) {\n    if (headers === void 0) {\n        headers = null;\n    }\n    return new AjaxObservable({ method: 'GET', url: url, headers: headers });\n}\nexport function ajaxPost(url, body, headers) {\n    return new AjaxObservable({ method: 'POST', url: url, body: body, headers: headers });\n}\nexport function ajaxDelete(url, headers) {\n    return new AjaxObservable({ method: 'DELETE', url: url, headers: headers });\n}\nexport function ajaxPut(url, body, headers) {\n    return new AjaxObservable({ method: 'PUT', url: url, body: body, headers: headers });\n}\nexport function ajaxPatch(url, body, headers) {\n    return new AjaxObservable({ method: 'PATCH', url: url, body: body, headers: headers });\n}\nvar mapResponse = /*@__PURE__*/ map(function (x, index) { return x.response; });\nexport function ajaxGetJSON(url, headers) {\n    return mapResponse(new AjaxObservable({\n        method: 'GET',\n        url: url,\n        responseType: 'json',\n        headers: headers\n    }));\n}\nvar AjaxObservable = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AjaxObservable, _super);\n    function AjaxObservable(urlOrRequest) {\n        var _this = _super.call(this) || this;\n        var request = {\n            async: true,\n            createXHR: function () {\n                return this.crossDomain ? getCORSRequest() : getXMLHttpRequest();\n            },\n            crossDomain: true,\n            withCredentials: false,\n            headers: {},\n            method: 'GET',\n            responseType: 'json',\n            timeout: 0\n        };\n        if (typeof urlOrRequest === 'string') {\n            request.url = urlOrRequest;\n        }\n        else {\n            for (var prop in urlOrRequest) {\n                if (urlOrRequest.hasOwnProperty(prop)) {\n                    request[prop] = urlOrRequest[prop];\n                }\n            }\n        }\n        _this.request = request;\n        return _this;\n    }\n    AjaxObservable.prototype._subscribe = function (subscriber) {\n        return new AjaxSubscriber(subscriber, this.request);\n    };\n    AjaxObservable.create = (function () {\n        var create = function (urlOrRequest) {\n            return new AjaxObservable(urlOrRequest);\n        };\n        create.get = ajaxGet;\n        create.post = ajaxPost;\n        create.delete = ajaxDelete;\n        create.put = ajaxPut;\n        create.patch = ajaxPatch;\n        create.getJSON = ajaxGetJSON;\n        return create;\n    })();\n    return AjaxObservable;\n}(Observable));\nexport { AjaxObservable };\nvar AjaxSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AjaxSubscriber, _super);\n    function AjaxSubscriber(destination, request) {\n        var _this = _super.call(this, destination) || this;\n        _this.request = request;\n        _this.done = false;\n        var headers = request.headers = request.headers || {};\n        if (!request.crossDomain && !_this.getHeader(headers, 'X-Requested-With')) {\n            headers['X-Requested-With'] = 'XMLHttpRequest';\n        }\n        var contentTypeHeader = _this.getHeader(headers, 'Content-Type');\n        if (!contentTypeHeader && !(root.FormData && request.body instanceof root.FormData) && typeof request.body !== 'undefined') {\n            headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';\n        }\n        request.body = _this.serializeBody(request.body, _this.getHeader(request.headers, 'Content-Type'));\n        _this.send();\n        return _this;\n    }\n    AjaxSubscriber.prototype.next = function (e) {\n        this.done = true;\n        var _a = this, xhr = _a.xhr, request = _a.request, destination = _a.destination;\n        var result;\n        try {\n            result = new AjaxResponse(e, xhr, request);\n        }\n        catch (err) {\n            return destination.error(err);\n        }\n        destination.next(result);\n    };\n    AjaxSubscriber.prototype.send = function () {\n        var _a = this, request = _a.request, _b = _a.request, user = _b.user, method = _b.method, url = _b.url, async = _b.async, password = _b.password, headers = _b.headers, body = _b.body;\n        try {\n            var xhr = this.xhr = request.createXHR();\n            this.setupEvents(xhr, request);\n            if (user) {\n                xhr.open(method, url, async, user, password);\n            }\n            else {\n                xhr.open(method, url, async);\n            }\n            if (async) {\n                xhr.timeout = request.timeout;\n                xhr.responseType = request.responseType;\n            }\n            if ('withCredentials' in xhr) {\n                xhr.withCredentials = !!request.withCredentials;\n            }\n            this.setHeaders(xhr, headers);\n            if (body) {\n                xhr.send(body);\n            }\n            else {\n                xhr.send();\n            }\n        }\n        catch (err) {\n            this.error(err);\n        }\n    };\n    AjaxSubscriber.prototype.serializeBody = function (body, contentType) {\n        if (!body || typeof body === 'string') {\n            return body;\n        }\n        else if (root.FormData && body instanceof root.FormData) {\n            return body;\n        }\n        if (contentType) {\n            var splitIndex = contentType.indexOf(';');\n            if (splitIndex !== -1) {\n                contentType = contentType.substring(0, splitIndex);\n            }\n        }\n        switch (contentType) {\n            case 'application/x-www-form-urlencoded':\n                return Object.keys(body).map(function (key) { return encodeURIComponent(key) + \"=\" + encodeURIComponent(body[key]); }).join('&');\n            case 'application/json':\n                return JSON.stringify(body);\n            default:\n                return body;\n        }\n    };\n    AjaxSubscriber.prototype.setHeaders = function (xhr, headers) {\n        for (var key in headers) {\n            if (headers.hasOwnProperty(key)) {\n                xhr.setRequestHeader(key, headers[key]);\n            }\n        }\n    };\n    AjaxSubscriber.prototype.getHeader = function (headers, headerName) {\n        for (var key in headers) {\n            if (key.toLowerCase() === headerName.toLowerCase()) {\n                return headers[key];\n            }\n        }\n        return undefined;\n    };\n    AjaxSubscriber.prototype.setupEvents = function (xhr, request) {\n        var progressSubscriber = request.progressSubscriber;\n        function xhrTimeout(e) {\n            var _a = xhrTimeout, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;\n            if (progressSubscriber) {\n                progressSubscriber.error(e);\n            }\n            var error;\n            try {\n                error = new AjaxTimeoutError(this, request);\n            }\n            catch (err) {\n                error = err;\n            }\n            subscriber.error(error);\n        }\n        xhr.ontimeout = xhrTimeout;\n        xhrTimeout.request = request;\n        xhrTimeout.subscriber = this;\n        xhrTimeout.progressSubscriber = progressSubscriber;\n        if (xhr.upload && 'withCredentials' in xhr) {\n            if (progressSubscriber) {\n                var xhrProgress_1;\n                xhrProgress_1 = function (e) {\n                    var progressSubscriber = xhrProgress_1.progressSubscriber;\n                    progressSubscriber.next(e);\n                };\n                if (root.XDomainRequest) {\n                    xhr.onprogress = xhrProgress_1;\n                }\n                else {\n                    xhr.upload.onprogress = xhrProgress_1;\n                }\n                xhrProgress_1.progressSubscriber = progressSubscriber;\n            }\n            var xhrError_1;\n            xhrError_1 = function (e) {\n                var _a = xhrError_1, progressSubscriber = _a.progressSubscriber, subscriber = _a.subscriber, request = _a.request;\n                if (progressSubscriber) {\n                    progressSubscriber.error(e);\n                }\n                var error;\n                try {\n                    error = new AjaxError('ajax error', this, request);\n                }\n                catch (err) {\n                    error = err;\n                }\n                subscriber.error(error);\n            };\n            xhr.onerror = xhrError_1;\n            xhrError_1.request = request;\n            xhrError_1.subscriber = this;\n            xhrError_1.progressSubscriber = progressSubscriber;\n        }\n        function xhrReadyStateChange(e) {\n            return;\n        }\n        xhr.onreadystatechange = xhrReadyStateChange;\n        xhrReadyStateChange.subscriber = this;\n        xhrReadyStateChange.progressSubscriber = progressSubscriber;\n        xhrReadyStateChange.request = request;\n        function xhrLoad(e) {\n            var _a = xhrLoad, subscriber = _a.subscriber, progressSubscriber = _a.progressSubscriber, request = _a.request;\n            if (this.readyState === 4) {\n                var status_1 = this.status === 1223 ? 204 : this.status;\n                var response = (this.responseType === 'text' ? (this.response || this.responseText) : this.response);\n                if (status_1 === 0) {\n                    status_1 = response ? 200 : 0;\n                }\n                if (status_1 < 400) {\n                    if (progressSubscriber) {\n                        progressSubscriber.complete();\n                    }\n                    subscriber.next(e);\n                    subscriber.complete();\n                }\n                else {\n                    if (progressSubscriber) {\n                        progressSubscriber.error(e);\n                    }\n                    var error = void 0;\n                    try {\n                        error = new AjaxError('ajax error ' + status_1, this, request);\n                    }\n                    catch (err) {\n                        error = err;\n                    }\n                    subscriber.error(error);\n                }\n            }\n        }\n        xhr.onload = xhrLoad;\n        xhrLoad.subscriber = this;\n        xhrLoad.progressSubscriber = progressSubscriber;\n        xhrLoad.request = request;\n    };\n    AjaxSubscriber.prototype.unsubscribe = function () {\n        var _a = this, done = _a.done, xhr = _a.xhr;\n        if (!done && xhr && xhr.readyState !== 4 && typeof xhr.abort === 'function') {\n            xhr.abort();\n        }\n        _super.prototype.unsubscribe.call(this);\n    };\n    return AjaxSubscriber;\n}(Subscriber));\nexport { AjaxSubscriber };\nvar AjaxResponse = /*@__PURE__*/ (function () {\n    function AjaxResponse(originalEvent, xhr, request) {\n        this.originalEvent = originalEvent;\n        this.xhr = xhr;\n        this.request = request;\n        this.status = xhr.status;\n        this.responseType = xhr.responseType || request.responseType;\n        this.response = parseXhrResponse(this.responseType, xhr);\n    }\n    return AjaxResponse;\n}());\nexport { AjaxResponse };\nvar AjaxErrorImpl = /*@__PURE__*/ (function () {\n    function AjaxErrorImpl(message, xhr, request) {\n        Error.call(this);\n        this.message = message;\n        this.name = 'AjaxError';\n        this.xhr = xhr;\n        this.request = request;\n        this.status = xhr.status;\n        this.responseType = xhr.responseType || request.responseType;\n        this.response = parseXhrResponse(this.responseType, xhr);\n        return this;\n    }\n    AjaxErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return AjaxErrorImpl;\n})();\nexport var AjaxError = AjaxErrorImpl;\nfunction parseJson(xhr) {\n    if ('response' in xhr) {\n        return xhr.responseType ? xhr.response : JSON.parse(xhr.response || xhr.responseText || 'null');\n    }\n    else {\n        return JSON.parse(xhr.responseText || 'null');\n    }\n}\nfunction parseXhrResponse(responseType, xhr) {\n    switch (responseType) {\n        case 'json':\n            return parseJson(xhr);\n        case 'xml':\n            return xhr.responseXML;\n        case 'text':\n        default:\n            return ('response' in xhr) ? xhr.response : xhr.responseText;\n    }\n}\nfunction AjaxTimeoutErrorImpl(xhr, request) {\n    AjaxError.call(this, 'ajax timeout', xhr, request);\n    this.name = 'AjaxTimeoutError';\n    return this;\n}\nexport var AjaxTimeoutError = AjaxTimeoutErrorImpl;\n//# sourceMappingURL=AjaxObservable.js.map\n","/** PURE_IMPORTS_START _AjaxObservable PURE_IMPORTS_END */\nimport { AjaxObservable } from './AjaxObservable';\nexport var ajax = /*@__PURE__*/ (function () { return AjaxObservable.create; })();\n//# sourceMappingURL=ajax.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function filter(predicate, thisArg) {\n    return function filterOperatorFunction(source) {\n        return source.lift(new FilterOperator(predicate, thisArg));\n    };\n}\nvar FilterOperator = /*@__PURE__*/ (function () {\n    function FilterOperator(predicate, thisArg) {\n        this.predicate = predicate;\n        this.thisArg = thisArg;\n    }\n    FilterOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new FilterSubscriber(subscriber, this.predicate, this.thisArg));\n    };\n    return FilterOperator;\n}());\nvar FilterSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(FilterSubscriber, _super);\n    function FilterSubscriber(destination, predicate, thisArg) {\n        var _this = _super.call(this, destination) || this;\n        _this.predicate = predicate;\n        _this.thisArg = thisArg;\n        _this.count = 0;\n        return _this;\n    }\n    FilterSubscriber.prototype._next = function (value) {\n        var result;\n        try {\n            result = this.predicate.call(this.thisArg, value, this.count++);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        if (result) {\n            this.destination.next(value);\n        }\n    };\n    return FilterSubscriber;\n}(Subscriber));\n//# sourceMappingURL=filter.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_util_noop,_util_isFunction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { noop } from '../util/noop';\nimport { isFunction } from '../util/isFunction';\nexport function tap(nextOrObserver, error, complete) {\n    return function tapOperatorFunction(source) {\n        return source.lift(new DoOperator(nextOrObserver, error, complete));\n    };\n}\nvar DoOperator = /*@__PURE__*/ (function () {\n    function DoOperator(nextOrObserver, error, complete) {\n        this.nextOrObserver = nextOrObserver;\n        this.error = error;\n        this.complete = complete;\n    }\n    DoOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new TapSubscriber(subscriber, this.nextOrObserver, this.error, this.complete));\n    };\n    return DoOperator;\n}());\nvar TapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(TapSubscriber, _super);\n    function TapSubscriber(destination, observerOrNext, error, complete) {\n        var _this = _super.call(this, destination) || this;\n        _this._tapNext = noop;\n        _this._tapError = noop;\n        _this._tapComplete = noop;\n        _this._tapError = error || noop;\n        _this._tapComplete = complete || noop;\n        if (isFunction(observerOrNext)) {\n            _this._context = _this;\n            _this._tapNext = observerOrNext;\n        }\n        else if (observerOrNext) {\n            _this._context = observerOrNext;\n            _this._tapNext = observerOrNext.next || noop;\n            _this._tapError = observerOrNext.error || noop;\n            _this._tapComplete = observerOrNext.complete || noop;\n        }\n        return _this;\n    }\n    TapSubscriber.prototype._next = function (value) {\n        try {\n            this._tapNext.call(this._context, value);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(value);\n    };\n    TapSubscriber.prototype._error = function (err) {\n        try {\n            this._tapError.call(this._context, err);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.error(err);\n    };\n    TapSubscriber.prototype._complete = function () {\n        try {\n            this._tapComplete.call(this._context);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        return this.destination.complete();\n    };\n    return TapSubscriber;\n}(Subscriber));\n//# sourceMappingURL=tap.js.map\n","/** PURE_IMPORTS_START _map PURE_IMPORTS_END */\nimport { map } from './map';\nexport function pluck() {\n    var properties = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        properties[_i] = arguments[_i];\n    }\n    var length = properties.length;\n    if (length === 0) {\n        throw new Error('list of properties cannot be empty.');\n    }\n    return function (source) { return map(plucker(properties, length))(source); };\n}\nfunction plucker(props, length) {\n    var mapper = function (x) {\n        var currentProp = x;\n        for (var i = 0; i < length; i++) {\n            var p = currentProp[props[i]];\n            if (typeof p !== 'undefined') {\n                currentProp = p;\n            }\n            else {\n                return undefined;\n            }\n        }\n        return currentProp;\n    };\n    return mapper;\n}\n//# sourceMappingURL=pluck.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nvar ArgumentOutOfRangeErrorImpl = /*@__PURE__*/ (function () {\n    function ArgumentOutOfRangeErrorImpl() {\n        Error.call(this);\n        this.message = 'argument out of range';\n        this.name = 'ArgumentOutOfRangeError';\n        return this;\n    }\n    ArgumentOutOfRangeErrorImpl.prototype = /*@__PURE__*/ Object.create(Error.prototype);\n    return ArgumentOutOfRangeErrorImpl;\n})();\nexport var ArgumentOutOfRangeError = ArgumentOutOfRangeErrorImpl;\n//# sourceMappingURL=ArgumentOutOfRangeError.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_util_ArgumentOutOfRangeError,_observable_empty PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';\nimport { empty } from '../observable/empty';\nexport function take(count) {\n    return function (source) {\n        if (count === 0) {\n            return empty();\n        }\n        else {\n            return source.lift(new TakeOperator(count));\n        }\n    };\n}\nvar TakeOperator = /*@__PURE__*/ (function () {\n    function TakeOperator(total) {\n        this.total = total;\n        if (this.total < 0) {\n            throw new ArgumentOutOfRangeError;\n        }\n    }\n    TakeOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new TakeSubscriber(subscriber, this.total));\n    };\n    return TakeOperator;\n}());\nvar TakeSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(TakeSubscriber, _super);\n    function TakeSubscriber(destination, total) {\n        var _this = _super.call(this, destination) || this;\n        _this.total = total;\n        _this.count = 0;\n        return _this;\n    }\n    TakeSubscriber.prototype._next = function (value) {\n        var total = this.total;\n        var count = ++this.count;\n        if (count <= total) {\n            this.destination.next(value);\n            if (count === total) {\n                this.destination.complete();\n                this.unsubscribe();\n            }\n        }\n    };\n    return TakeSubscriber;\n}(Subscriber));\n//# sourceMappingURL=take.js.map\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_InnerSubscriber,_util_subscribeToResult,_map,_observable_from PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { InnerSubscriber } from '../InnerSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { map } from './map';\nimport { from } from '../observable/from';\nexport function switchMap(project, resultSelector) {\n    if (typeof resultSelector === 'function') {\n        return function (source) { return source.pipe(switchMap(function (a, i) { return from(project(a, i)).pipe(map(function (b, ii) { return resultSelector(a, b, i, ii); })); })); };\n    }\n    return function (source) { return source.lift(new SwitchMapOperator(project)); };\n}\nvar SwitchMapOperator = /*@__PURE__*/ (function () {\n    function SwitchMapOperator(project) {\n        this.project = project;\n    }\n    SwitchMapOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new SwitchMapSubscriber(subscriber, this.project));\n    };\n    return SwitchMapOperator;\n}());\nvar SwitchMapSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SwitchMapSubscriber, _super);\n    function SwitchMapSubscriber(destination, project) {\n        var _this = _super.call(this, destination) || this;\n        _this.project = project;\n        _this.index = 0;\n        return _this;\n    }\n    SwitchMapSubscriber.prototype._next = function (value) {\n        var result;\n        var index = this.index++;\n        try {\n            result = this.project(value, index);\n        }\n        catch (error) {\n            this.destination.error(error);\n            return;\n        }\n        this._innerSub(result, value, index);\n    };\n    SwitchMapSubscriber.prototype._innerSub = function (result, value, index) {\n        var innerSubscription = this.innerSubscription;\n        if (innerSubscription) {\n            innerSubscription.unsubscribe();\n        }\n        var innerSubscriber = new InnerSubscriber(this, undefined, undefined);\n        var destination = this.destination;\n        destination.add(innerSubscriber);\n        this.innerSubscription = subscribeToResult(this, result, value, index, innerSubscriber);\n    };\n    SwitchMapSubscriber.prototype._complete = function () {\n        var innerSubscription = this.innerSubscription;\n        if (!innerSubscription || innerSubscription.closed) {\n            _super.prototype._complete.call(this);\n        }\n        this.unsubscribe();\n    };\n    SwitchMapSubscriber.prototype._unsubscribe = function () {\n        this.innerSubscription = null;\n    };\n    SwitchMapSubscriber.prototype.notifyComplete = function (innerSub) {\n        var destination = this.destination;\n        destination.remove(innerSub);\n        this.innerSubscription = null;\n        if (this.isStopped) {\n            _super.prototype._complete.call(this);\n        }\n    };\n    SwitchMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.destination.next(innerValue);\n    };\n    return SwitchMapSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=switchMap.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function distinctUntilChanged(compare, keySelector) {\n    return function (source) { return source.lift(new DistinctUntilChangedOperator(compare, keySelector)); };\n}\nvar DistinctUntilChangedOperator = /*@__PURE__*/ (function () {\n    function DistinctUntilChangedOperator(compare, keySelector) {\n        this.compare = compare;\n        this.keySelector = keySelector;\n    }\n    DistinctUntilChangedOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));\n    };\n    return DistinctUntilChangedOperator;\n}());\nvar DistinctUntilChangedSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(DistinctUntilChangedSubscriber, _super);\n    function DistinctUntilChangedSubscriber(destination, compare, keySelector) {\n        var _this = _super.call(this, destination) || this;\n        _this.keySelector = keySelector;\n        _this.hasKey = false;\n        if (typeof compare === 'function') {\n            _this.compare = compare;\n        }\n        return _this;\n    }\n    DistinctUntilChangedSubscriber.prototype.compare = function (x, y) {\n        return x === y;\n    };\n    DistinctUntilChangedSubscriber.prototype._next = function (value) {\n        var key;\n        try {\n            var keySelector = this.keySelector;\n            key = keySelector ? keySelector(value) : value;\n        }\n        catch (err) {\n            return this.destination.error(err);\n        }\n        var result = false;\n        if (this.hasKey) {\n            try {\n                var compare = this.compare;\n                result = compare(this.key, key);\n            }\n            catch (err) {\n                return this.destination.error(err);\n            }\n        }\n        else {\n            this.hasKey = true;\n        }\n        if (!result) {\n            this.key = key;\n            this.destination.next(value);\n        }\n    };\n    return DistinctUntilChangedSubscriber;\n}(Subscriber));\n//# sourceMappingURL=distinctUntilChanged.js.map\n","/** PURE_IMPORTS_START _distinctUntilChanged PURE_IMPORTS_END */\nimport { distinctUntilChanged } from './distinctUntilChanged';\nexport function distinctUntilKeyChanged(key, compare) {\n    return distinctUntilChanged(function (x, y) { return compare ? compare(x[key], y[key]) : x[key] === y[key]; });\n}\n//# sourceMappingURL=distinctUntilKeyChanged.js.map\n","/** PURE_IMPORTS_START tslib,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscription } from '../Subscription';\nvar Action = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(Action, _super);\n    function Action(scheduler, work) {\n        return _super.call(this) || this;\n    }\n    Action.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return this;\n    };\n    return Action;\n}(Subscription));\nexport { Action };\n//# sourceMappingURL=Action.js.map\n","/** PURE_IMPORTS_START _observable_empty,_observable_of,_observable_throwError PURE_IMPORTS_END */\nimport { empty } from './observable/empty';\nimport { of } from './observable/of';\nimport { throwError } from './observable/throwError';\nexport var NotificationKind;\n/*@__PURE__*/ (function (NotificationKind) {\n    NotificationKind[\"NEXT\"] = \"N\";\n    NotificationKind[\"ERROR\"] = \"E\";\n    NotificationKind[\"COMPLETE\"] = \"C\";\n})(NotificationKind || (NotificationKind = {}));\nvar Notification = /*@__PURE__*/ (function () {\n    function Notification(kind, value, error) {\n        this.kind = kind;\n        this.value = value;\n        this.error = error;\n        this.hasValue = kind === 'N';\n    }\n    Notification.prototype.observe = function (observer) {\n        switch (this.kind) {\n            case 'N':\n                return observer.next && observer.next(this.value);\n            case 'E':\n                return observer.error && observer.error(this.error);\n            case 'C':\n                return observer.complete && observer.complete();\n        }\n    };\n    Notification.prototype.do = function (next, error, complete) {\n        var kind = this.kind;\n        switch (kind) {\n            case 'N':\n                return next && next(this.value);\n            case 'E':\n                return error && error(this.error);\n            case 'C':\n                return complete && complete();\n        }\n    };\n    Notification.prototype.accept = function (nextOrObserver, error, complete) {\n        if (nextOrObserver && typeof nextOrObserver.next === 'function') {\n            return this.observe(nextOrObserver);\n        }\n        else {\n            return this.do(nextOrObserver, error, complete);\n        }\n    };\n    Notification.prototype.toObservable = function () {\n        var kind = this.kind;\n        switch (kind) {\n            case 'N':\n                return of(this.value);\n            case 'E':\n                return throwError(this.error);\n            case 'C':\n                return empty();\n        }\n        throw new Error('unexpected notification kind value');\n    };\n    Notification.createNext = function (value) {\n        if (typeof value !== 'undefined') {\n            return new Notification('N', value);\n        }\n        return Notification.undefinedValueNotification;\n    };\n    Notification.createError = function (err) {\n        return new Notification('E', undefined, err);\n    };\n    Notification.createComplete = function () {\n        return Notification.completeNotification;\n    };\n    Notification.completeNotification = new Notification('C');\n    Notification.undefinedValueNotification = new Notification('N', undefined);\n    return Notification;\n}());\nexport { Notification };\n//# sourceMappingURL=Notification.js.map\n","/** PURE_IMPORTS_START tslib,_Action PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Action } from './Action';\nvar AsyncAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AsyncAction, _super);\n    function AsyncAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        _this.pending = false;\n        return _this;\n    }\n    AsyncAction.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (this.closed) {\n            return this;\n        }\n        this.state = state;\n        var id = this.id;\n        var scheduler = this.scheduler;\n        if (id != null) {\n            this.id = this.recycleAsyncId(scheduler, id, delay);\n        }\n        this.pending = true;\n        this.delay = delay;\n        this.id = this.id || this.requestAsyncId(scheduler, this.id, delay);\n        return this;\n    };\n    AsyncAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return setInterval(scheduler.flush.bind(scheduler, this), delay);\n    };\n    AsyncAction.prototype.recycleAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay !== null && this.delay === delay && this.pending === false) {\n            return id;\n        }\n        clearInterval(id);\n        return undefined;\n    };\n    AsyncAction.prototype.execute = function (state, delay) {\n        if (this.closed) {\n            return new Error('executing a cancelled action');\n        }\n        this.pending = false;\n        var error = this._execute(state, delay);\n        if (error) {\n            return error;\n        }\n        else if (this.pending === false && this.id != null) {\n            this.id = this.recycleAsyncId(this.scheduler, this.id, null);\n        }\n    };\n    AsyncAction.prototype._execute = function (state, delay) {\n        var errored = false;\n        var errorValue = undefined;\n        try {\n            this.work(state);\n        }\n        catch (e) {\n            errored = true;\n            errorValue = !!e && e || new Error(e);\n        }\n        if (errored) {\n            this.unsubscribe();\n            return errorValue;\n        }\n    };\n    AsyncAction.prototype._unsubscribe = function () {\n        var id = this.id;\n        var scheduler = this.scheduler;\n        var actions = scheduler.actions;\n        var index = actions.indexOf(this);\n        this.work = null;\n        this.state = null;\n        this.pending = false;\n        this.scheduler = null;\n        if (index !== -1) {\n            actions.splice(index, 1);\n        }\n        if (id != null) {\n            this.id = this.recycleAsyncId(scheduler, id, null);\n        }\n        this.delay = null;\n    };\n    return AsyncAction;\n}(Action));\nexport { AsyncAction };\n//# sourceMappingURL=AsyncAction.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncAction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncAction } from './AsyncAction';\nvar QueueAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(QueueAction, _super);\n    function QueueAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        return _this;\n    }\n    QueueAction.prototype.schedule = function (state, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay > 0) {\n            return _super.prototype.schedule.call(this, state, delay);\n        }\n        this.delay = delay;\n        this.state = state;\n        this.scheduler.flush(this);\n        return this;\n    };\n    QueueAction.prototype.execute = function (state, delay) {\n        return (delay > 0 || this.closed) ?\n            _super.prototype.execute.call(this, state, delay) :\n            this._execute(state, delay);\n    };\n    QueueAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);\n        }\n        return scheduler.flush(this);\n    };\n    return QueueAction;\n}(AsyncAction));\nexport { QueueAction };\n//# sourceMappingURL=QueueAction.js.map\n","var Scheduler = /*@__PURE__*/ (function () {\n    function Scheduler(SchedulerAction, now) {\n        if (now === void 0) {\n            now = Scheduler.now;\n        }\n        this.SchedulerAction = SchedulerAction;\n        this.now = now;\n    }\n    Scheduler.prototype.schedule = function (work, delay, state) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        return new this.SchedulerAction(this, work).schedule(state, delay);\n    };\n    Scheduler.now = function () { return Date.now(); };\n    return Scheduler;\n}());\nexport { Scheduler };\n//# sourceMappingURL=Scheduler.js.map\n","/** PURE_IMPORTS_START tslib,_Scheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Scheduler } from '../Scheduler';\nvar AsyncScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AsyncScheduler, _super);\n    function AsyncScheduler(SchedulerAction, now) {\n        if (now === void 0) {\n            now = Scheduler.now;\n        }\n        var _this = _super.call(this, SchedulerAction, function () {\n            if (AsyncScheduler.delegate && AsyncScheduler.delegate !== _this) {\n                return AsyncScheduler.delegate.now();\n            }\n            else {\n                return now();\n            }\n        }) || this;\n        _this.actions = [];\n        _this.active = false;\n        _this.scheduled = undefined;\n        return _this;\n    }\n    AsyncScheduler.prototype.schedule = function (work, delay, state) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (AsyncScheduler.delegate && AsyncScheduler.delegate !== this) {\n            return AsyncScheduler.delegate.schedule(work, delay, state);\n        }\n        else {\n            return _super.prototype.schedule.call(this, work, delay, state);\n        }\n    };\n    AsyncScheduler.prototype.flush = function (action) {\n        var actions = this.actions;\n        if (this.active) {\n            actions.push(action);\n            return;\n        }\n        var error;\n        this.active = true;\n        do {\n            if (error = action.execute(action.state, action.delay)) {\n                break;\n            }\n        } while (action = actions.shift());\n        this.active = false;\n        if (error) {\n            while (action = actions.shift()) {\n                action.unsubscribe();\n            }\n            throw error;\n        }\n    };\n    return AsyncScheduler;\n}(Scheduler));\nexport { AsyncScheduler };\n//# sourceMappingURL=AsyncScheduler.js.map\n","/** PURE_IMPORTS_START _QueueAction,_QueueScheduler PURE_IMPORTS_END */\nimport { QueueAction } from './QueueAction';\nimport { QueueScheduler } from './QueueScheduler';\nexport var queue = /*@__PURE__*/ new QueueScheduler(QueueAction);\n//# sourceMappingURL=queue.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncScheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncScheduler } from './AsyncScheduler';\nvar QueueScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(QueueScheduler, _super);\n    function QueueScheduler() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    return QueueScheduler;\n}(AsyncScheduler));\nexport { QueueScheduler };\n//# sourceMappingURL=QueueScheduler.js.map\n","/** PURE_IMPORTS_START _Observable PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nexport function throwError(error, scheduler) {\n    if (!scheduler) {\n        return new Observable(function (subscriber) { return subscriber.error(error); });\n    }\n    else {\n        return new Observable(function (subscriber) { return scheduler.schedule(dispatch, 0, { error: error, subscriber: subscriber }); });\n    }\n}\nfunction dispatch(_a) {\n    var error = _a.error, subscriber = _a.subscriber;\n    subscriber.error(error);\n}\n//# sourceMappingURL=throwError.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_Notification PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { Notification } from '../Notification';\nexport function observeOn(scheduler, delay) {\n    if (delay === void 0) {\n        delay = 0;\n    }\n    return function observeOnOperatorFunction(source) {\n        return source.lift(new ObserveOnOperator(scheduler, delay));\n    };\n}\nvar ObserveOnOperator = /*@__PURE__*/ (function () {\n    function ObserveOnOperator(scheduler, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        this.scheduler = scheduler;\n        this.delay = delay;\n    }\n    ObserveOnOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ObserveOnSubscriber(subscriber, this.scheduler, this.delay));\n    };\n    return ObserveOnOperator;\n}());\nexport { ObserveOnOperator };\nvar ObserveOnSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ObserveOnSubscriber, _super);\n    function ObserveOnSubscriber(destination, scheduler, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        var _this = _super.call(this, destination) || this;\n        _this.scheduler = scheduler;\n        _this.delay = delay;\n        return _this;\n    }\n    ObserveOnSubscriber.dispatch = function (arg) {\n        var notification = arg.notification, destination = arg.destination;\n        notification.observe(destination);\n        this.unsubscribe();\n    };\n    ObserveOnSubscriber.prototype.scheduleMessage = function (notification) {\n        var destination = this.destination;\n        destination.add(this.scheduler.schedule(ObserveOnSubscriber.dispatch, this.delay, new ObserveOnMessage(notification, this.destination)));\n    };\n    ObserveOnSubscriber.prototype._next = function (value) {\n        this.scheduleMessage(Notification.createNext(value));\n    };\n    ObserveOnSubscriber.prototype._error = function (err) {\n        this.scheduleMessage(Notification.createError(err));\n        this.unsubscribe();\n    };\n    ObserveOnSubscriber.prototype._complete = function () {\n        this.scheduleMessage(Notification.createComplete());\n        this.unsubscribe();\n    };\n    return ObserveOnSubscriber;\n}(Subscriber));\nexport { ObserveOnSubscriber };\nvar ObserveOnMessage = /*@__PURE__*/ (function () {\n    function ObserveOnMessage(notification, destination) {\n        this.notification = notification;\n        this.destination = destination;\n    }\n    return ObserveOnMessage;\n}());\nexport { ObserveOnMessage };\n//# sourceMappingURL=observeOn.js.map\n","/** PURE_IMPORTS_START tslib,_Subject,_scheduler_queue,_Subscription,_operators_observeOn,_util_ObjectUnsubscribedError,_SubjectSubscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subject } from './Subject';\nimport { queue } from './scheduler/queue';\nimport { Subscription } from './Subscription';\nimport { ObserveOnSubscriber } from './operators/observeOn';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nvar ReplaySubject = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ReplaySubject, _super);\n    function ReplaySubject(bufferSize, windowTime, scheduler) {\n        if (bufferSize === void 0) {\n            bufferSize = Number.POSITIVE_INFINITY;\n        }\n        if (windowTime === void 0) {\n            windowTime = Number.POSITIVE_INFINITY;\n        }\n        var _this = _super.call(this) || this;\n        _this.scheduler = scheduler;\n        _this._events = [];\n        _this._infiniteTimeWindow = false;\n        _this._bufferSize = bufferSize < 1 ? 1 : bufferSize;\n        _this._windowTime = windowTime < 1 ? 1 : windowTime;\n        if (windowTime === Number.POSITIVE_INFINITY) {\n            _this._infiniteTimeWindow = true;\n            _this.next = _this.nextInfiniteTimeWindow;\n        }\n        else {\n            _this.next = _this.nextTimeWindow;\n        }\n        return _this;\n    }\n    ReplaySubject.prototype.nextInfiniteTimeWindow = function (value) {\n        var _events = this._events;\n        _events.push(value);\n        if (_events.length > this._bufferSize) {\n            _events.shift();\n        }\n        _super.prototype.next.call(this, value);\n    };\n    ReplaySubject.prototype.nextTimeWindow = function (value) {\n        this._events.push(new ReplayEvent(this._getNow(), value));\n        this._trimBufferThenGetEvents();\n        _super.prototype.next.call(this, value);\n    };\n    ReplaySubject.prototype._subscribe = function (subscriber) {\n        var _infiniteTimeWindow = this._infiniteTimeWindow;\n        var _events = _infiniteTimeWindow ? this._events : this._trimBufferThenGetEvents();\n        var scheduler = this.scheduler;\n        var len = _events.length;\n        var subscription;\n        if (this.closed) {\n            throw new ObjectUnsubscribedError();\n        }\n        else if (this.isStopped || this.hasError) {\n            subscription = Subscription.EMPTY;\n        }\n        else {\n            this.observers.push(subscriber);\n            subscription = new SubjectSubscription(this, subscriber);\n        }\n        if (scheduler) {\n            subscriber.add(subscriber = new ObserveOnSubscriber(subscriber, scheduler));\n        }\n        if (_infiniteTimeWindow) {\n            for (var i = 0; i < len && !subscriber.closed; i++) {\n                subscriber.next(_events[i]);\n            }\n        }\n        else {\n            for (var i = 0; i < len && !subscriber.closed; i++) {\n                subscriber.next(_events[i].value);\n            }\n        }\n        if (this.hasError) {\n            subscriber.error(this.thrownError);\n        }\n        else if (this.isStopped) {\n            subscriber.complete();\n        }\n        return subscription;\n    };\n    ReplaySubject.prototype._getNow = function () {\n        return (this.scheduler || queue).now();\n    };\n    ReplaySubject.prototype._trimBufferThenGetEvents = function () {\n        var now = this._getNow();\n        var _bufferSize = this._bufferSize;\n        var _windowTime = this._windowTime;\n        var _events = this._events;\n        var eventsCount = _events.length;\n        var spliceCount = 0;\n        while (spliceCount < eventsCount) {\n            if ((now - _events[spliceCount].time) < _windowTime) {\n                break;\n            }\n            spliceCount++;\n        }\n        if (eventsCount > _bufferSize) {\n            spliceCount = Math.max(spliceCount, eventsCount - _bufferSize);\n        }\n        if (spliceCount > 0) {\n            _events.splice(0, spliceCount);\n        }\n        return _events;\n    };\n    return ReplaySubject;\n}(Subject));\nexport { ReplaySubject };\nvar ReplayEvent = /*@__PURE__*/ (function () {\n    function ReplayEvent(time, value) {\n        this.time = time;\n        this.value = value;\n    }\n    return ReplayEvent;\n}());\n//# sourceMappingURL=ReplaySubject.js.map\n","/** PURE_IMPORTS_START _ReplaySubject PURE_IMPORTS_END */\nimport { ReplaySubject } from '../ReplaySubject';\nexport function shareReplay(configOrBufferSize, windowTime, scheduler) {\n    var config;\n    if (configOrBufferSize && typeof configOrBufferSize === 'object') {\n        config = configOrBufferSize;\n    }\n    else {\n        config = {\n            bufferSize: configOrBufferSize,\n            windowTime: windowTime,\n            refCount: false,\n            scheduler: scheduler\n        };\n    }\n    return function (source) { return source.lift(shareReplayOperator(config)); };\n}\nfunction shareReplayOperator(_a) {\n    var _b = _a.bufferSize, bufferSize = _b === void 0 ? Number.POSITIVE_INFINITY : _b, _c = _a.windowTime, windowTime = _c === void 0 ? Number.POSITIVE_INFINITY : _c, useRefCount = _a.refCount, scheduler = _a.scheduler;\n    var subject;\n    var refCount = 0;\n    var subscription;\n    var hasError = false;\n    var isComplete = false;\n    return function shareReplayOperation(source) {\n        refCount++;\n        if (!subject || hasError) {\n            hasError = false;\n            subject = new ReplaySubject(bufferSize, windowTime, scheduler);\n            subscription = source.subscribe({\n                next: function (value) { subject.next(value); },\n                error: function (err) {\n                    hasError = true;\n                    subject.error(err);\n                },\n                complete: function () {\n                    isComplete = true;\n                    subject.complete();\n                },\n            });\n        }\n        var innerSub = subject.subscribe(this);\n        this.add(function () {\n            refCount--;\n            innerSub.unsubscribe();\n            if (subscription && !isComplete && useRefCount && refCount === 0) {\n                subscription.unsubscribe();\n                subscription = undefined;\n                subject = undefined;\n            }\n        });\n    };\n}\n//# sourceMappingURL=shareReplay.js.map\n","/** PURE_IMPORTS_START _AsyncAction,_AsyncScheduler PURE_IMPORTS_END */\nimport { AsyncAction } from './AsyncAction';\nimport { AsyncScheduler } from './AsyncScheduler';\nexport var async = /*@__PURE__*/ new AsyncScheduler(AsyncAction);\n//# sourceMappingURL=async.js.map\n","/** PURE_IMPORTS_START tslib,_scheduler_async,_util_isDate,_Subscriber,_Notification PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { async } from '../scheduler/async';\nimport { isDate } from '../util/isDate';\nimport { Subscriber } from '../Subscriber';\nimport { Notification } from '../Notification';\nexport function delay(delay, scheduler) {\n    if (scheduler === void 0) {\n        scheduler = async;\n    }\n    var absoluteDelay = isDate(delay);\n    var delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);\n    return function (source) { return source.lift(new DelayOperator(delayFor, scheduler)); };\n}\nvar DelayOperator = /*@__PURE__*/ (function () {\n    function DelayOperator(delay, scheduler) {\n        this.delay = delay;\n        this.scheduler = scheduler;\n    }\n    DelayOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));\n    };\n    return DelayOperator;\n}());\nvar DelaySubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(DelaySubscriber, _super);\n    function DelaySubscriber(destination, delay, scheduler) {\n        var _this = _super.call(this, destination) || this;\n        _this.delay = delay;\n        _this.scheduler = scheduler;\n        _this.queue = [];\n        _this.active = false;\n        _this.errored = false;\n        return _this;\n    }\n    DelaySubscriber.dispatch = function (state) {\n        var source = state.source;\n        var queue = source.queue;\n        var scheduler = state.scheduler;\n        var destination = state.destination;\n        while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {\n            queue.shift().notification.observe(destination);\n        }\n        if (queue.length > 0) {\n            var delay_1 = Math.max(0, queue[0].time - scheduler.now());\n            this.schedule(state, delay_1);\n        }\n        else {\n            this.unsubscribe();\n            source.active = false;\n        }\n    };\n    DelaySubscriber.prototype._schedule = function (scheduler) {\n        this.active = true;\n        var destination = this.destination;\n        destination.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {\n            source: this, destination: this.destination, scheduler: scheduler\n        }));\n    };\n    DelaySubscriber.prototype.scheduleNotification = function (notification) {\n        if (this.errored === true) {\n            return;\n        }\n        var scheduler = this.scheduler;\n        var message = new DelayMessage(scheduler.now() + this.delay, notification);\n        this.queue.push(message);\n        if (this.active === false) {\n            this._schedule(scheduler);\n        }\n    };\n    DelaySubscriber.prototype._next = function (value) {\n        this.scheduleNotification(Notification.createNext(value));\n    };\n    DelaySubscriber.prototype._error = function (err) {\n        this.errored = true;\n        this.queue = [];\n        this.destination.error(err);\n        this.unsubscribe();\n    };\n    DelaySubscriber.prototype._complete = function () {\n        this.scheduleNotification(Notification.createComplete());\n        this.unsubscribe();\n    };\n    return DelaySubscriber;\n}(Subscriber));\nvar DelayMessage = /*@__PURE__*/ (function () {\n    function DelayMessage(time, notification) {\n        this.time = time;\n        this.notification = notification;\n    }\n    return DelayMessage;\n}());\n//# sourceMappingURL=delay.js.map\n","/** PURE_IMPORTS_START  PURE_IMPORTS_END */\nexport function isDate(value) {\n    return value instanceof Date && !isNaN(+value);\n}\n//# sourceMappingURL=isDate.js.map\n","/** PURE_IMPORTS_START _switchMap PURE_IMPORTS_END */\nimport { switchMap } from './switchMap';\nexport function switchMapTo(innerObservable, resultSelector) {\n    return resultSelector ? switchMap(function () { return innerObservable; }, resultSelector) : switchMap(function () { return innerObservable; });\n}\n//# sourceMappingURL=switchMapTo.js.map\n","/** PURE_IMPORTS_START _Observable,_util_noop PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { noop } from '../util/noop';\nexport var NEVER = /*@__PURE__*/ new Observable(noop);\nexport function never() {\n    return NEVER;\n}\n//# sourceMappingURL=never.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function scan(accumulator, seed) {\n    var hasSeed = false;\n    if (arguments.length >= 2) {\n        hasSeed = true;\n    }\n    return function scanOperatorFunction(source) {\n        return source.lift(new ScanOperator(accumulator, seed, hasSeed));\n    };\n}\nvar ScanOperator = /*@__PURE__*/ (function () {\n    function ScanOperator(accumulator, seed, hasSeed) {\n        if (hasSeed === void 0) {\n            hasSeed = false;\n        }\n        this.accumulator = accumulator;\n        this.seed = seed;\n        this.hasSeed = hasSeed;\n    }\n    ScanOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));\n    };\n    return ScanOperator;\n}());\nvar ScanSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ScanSubscriber, _super);\n    function ScanSubscriber(destination, accumulator, _seed, hasSeed) {\n        var _this = _super.call(this, destination) || this;\n        _this.accumulator = accumulator;\n        _this._seed = _seed;\n        _this.hasSeed = hasSeed;\n        _this.index = 0;\n        return _this;\n    }\n    Object.defineProperty(ScanSubscriber.prototype, \"seed\", {\n        get: function () {\n            return this._seed;\n        },\n        set: function (value) {\n            this.hasSeed = true;\n            this._seed = value;\n        },\n        enumerable: true,\n        configurable: true\n    });\n    ScanSubscriber.prototype._next = function (value) {\n        if (!this.hasSeed) {\n            this.seed = value;\n            this.destination.next(value);\n        }\n        else {\n            return this._tryNext(value);\n        }\n    };\n    ScanSubscriber.prototype._tryNext = function (value) {\n        var index = this.index++;\n        var result;\n        try {\n            result = this.accumulator(this.seed, value, index);\n        }\n        catch (err) {\n            this.destination.error(err);\n        }\n        this.seed = result;\n        this.destination.next(result);\n    };\n    return ScanSubscriber;\n}(Subscriber));\n//# sourceMappingURL=scan.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function mapTo(value) {\n    return function (source) { return source.lift(new MapToOperator(value)); };\n}\nvar MapToOperator = /*@__PURE__*/ (function () {\n    function MapToOperator(value) {\n        this.value = value;\n    }\n    MapToOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new MapToSubscriber(subscriber, this.value));\n    };\n    return MapToOperator;\n}());\nvar MapToSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(MapToSubscriber, _super);\n    function MapToSubscriber(destination, value) {\n        var _this = _super.call(this, destination) || this;\n        _this.value = value;\n        return _this;\n    }\n    MapToSubscriber.prototype._next = function (x) {\n        this.destination.next(this.value);\n    };\n    return MapToSubscriber;\n}(Subscriber));\n//# sourceMappingURL=mapTo.js.map\n","/** PURE_IMPORTS_START _of,_operators_concatAll PURE_IMPORTS_END */\nimport { of } from './of';\nimport { concatAll } from '../operators/concatAll';\nexport function concat() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    return concatAll()(of.apply(void 0, observables));\n}\n//# sourceMappingURL=concat.js.map\n","/** PURE_IMPORTS_START _mergeAll PURE_IMPORTS_END */\nimport { mergeAll } from './mergeAll';\nexport function concatAll() {\n    return mergeAll(1);\n}\n//# sourceMappingURL=concatAll.js.map\n","/** PURE_IMPORTS_START _observable_concat,_util_isScheduler PURE_IMPORTS_END */\nimport { concat } from '../observable/concat';\nimport { isScheduler } from '../util/isScheduler';\nexport function startWith() {\n    var array = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        array[_i] = arguments[_i];\n    }\n    var scheduler = array[array.length - 1];\n    if (isScheduler(scheduler)) {\n        array.pop();\n        return function (source) { return concat(array, source, scheduler); };\n    }\n    else {\n        return function (source) { return concat(array, source); };\n    }\n}\n//# sourceMappingURL=startWith.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function skip(count) {\n    return function (source) { return source.lift(new SkipOperator(count)); };\n}\nvar SkipOperator = /*@__PURE__*/ (function () {\n    function SkipOperator(total) {\n        this.total = total;\n    }\n    SkipOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new SkipSubscriber(subscriber, this.total));\n    };\n    return SkipOperator;\n}());\nvar SkipSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(SkipSubscriber, _super);\n    function SkipSubscriber(destination, total) {\n        var _this = _super.call(this, destination) || this;\n        _this.total = total;\n        _this.count = 0;\n        return _this;\n    }\n    SkipSubscriber.prototype._next = function (x) {\n        if (++this.count > this.total) {\n            this.destination.next(x);\n        }\n    };\n    return SkipSubscriber;\n}(Subscriber));\n//# sourceMappingURL=skip.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport {\n  distinctUntilChanged,\n  map,\n  mapTo,\n  pluck,\n  shareReplay,\n  skip,\n  startWith,\n  switchMap\n} from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Switch options\n */\ninterface SwitchOptions {\n  location$: Observable<string>        /* Location observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for document load events\n */\nconst load$ = fromEvent(document, \"DOMContentLoaded\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch document\n *\n * @return Document observable\n */\nexport function watchDocument(): Observable<Document> {\n  return load$\n    .pipe(\n      mapTo(document),\n      shareReplay(1)\n    )\n}\n\n/**\n * Watch document switch\n *\n * This function returns an observables that fetches a document if the provided\n * location observable emits a new value (i.e. URL). If the emitted URL points\n * to the same page, the request is effectively ignored (e.g. when only the\n * fragment identifier changes).\n *\n * @param options - Options\n *\n * @return Document switch observable\n */\nexport function watchDocumentSwitch(\n  { location$ }: SwitchOptions\n): Observable<Document> {\n  return location$\n    .pipe(\n      startWith(location.href),\n      map(url => url.replace(/#[^#]+$/, \"\")),\n      distinctUntilChanged(),\n      skip(1),\n\n      /* Fetch document */\n      switchMap(url => ajax({\n        url,\n        responseType: \"document\",\n        withCredentials: true\n      })\n        .pipe<Document>(\n          pluck(\"response\")\n        )\n      ),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve an element matching the query selector\n *\n * @template T - Element type\n *\n * @param selector - Query selector\n * @param node - Node of reference\n *\n * @return Element\n */\nexport function getElement<T extends HTMLElement>(\n  selector: string, node: ParentNode = document\n): T | undefined {\n  return node.querySelector<T>(selector) || undefined\n}\n\n/**\n * Retrieve all elements matching the query selector\n *\n * @template T - Element type\n *\n * @param selector - Query selector\n * @param node - Node of reference\n *\n * @return Elements\n */\nexport function getElements<T extends HTMLElement>(\n  selector: string, node: ParentNode = document\n): T[] {\n  return Array.from(node.querySelectorAll<T>(selector))\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent, merge } from \"rxjs\"\nimport { map, shareReplay, startWith } from \"rxjs/operators\"\n\nimport { ViewportSize } from \"../../viewport\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Element offset\n */\nexport interface ElementOffset {\n  x: number                            /* Horizontal offset */\n  y: number                            /* Vertical offset */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve element offset\n *\n * @param el - HTML element\n *\n * @return Element offset\n */\nexport function getElementOffset(el: HTMLElement): ElementOffset {\n  return {\n    x: el.scrollLeft,\n    y: el.scrollTop\n  }\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch element offset\n *\n * @param el - Element\n * @param options - Options\n *\n * @return Element offset observable\n */\nexport function watchElementOffset(\n  el: HTMLElement, { size$ }: Options\n): Observable<ElementOffset> {\n  const scroll$ = fromEvent(el, \"scroll\")\n  return merge(scroll$, size$)\n    .pipe(\n      map(() => getElementOffset(el)),\n      startWith(getElementOffset(el)),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nexport function refCount() {\n    return function refCountOperatorFunction(source) {\n        return source.lift(new RefCountOperator(source));\n    };\n}\nvar RefCountOperator = /*@__PURE__*/ (function () {\n    function RefCountOperator(connectable) {\n        this.connectable = connectable;\n    }\n    RefCountOperator.prototype.call = function (subscriber, source) {\n        var connectable = this.connectable;\n        connectable._refCount++;\n        var refCounter = new RefCountSubscriber(subscriber, connectable);\n        var subscription = source.subscribe(refCounter);\n        if (!refCounter.closed) {\n            refCounter.connection = connectable.connect();\n        }\n        return subscription;\n    };\n    return RefCountOperator;\n}());\nvar RefCountSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(RefCountSubscriber, _super);\n    function RefCountSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    RefCountSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (!connectable) {\n            this.connection = null;\n            return;\n        }\n        this.connectable = null;\n        var refCount = connectable._refCount;\n        if (refCount <= 0) {\n            this.connection = null;\n            return;\n        }\n        connectable._refCount = refCount - 1;\n        if (refCount > 1) {\n            this.connection = null;\n            return;\n        }\n        var connection = this.connection;\n        var sharedConnection = connectable._connection;\n        this.connection = null;\n        if (sharedConnection && (!connection || sharedConnection === connection)) {\n            sharedConnection.unsubscribe();\n        }\n    };\n    return RefCountSubscriber;\n}(Subscriber));\n//# sourceMappingURL=refCount.js.map\n","/** PURE_IMPORTS_START tslib,_Subject,_Observable,_Subscriber,_Subscription,_operators_refCount PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { SubjectSubscriber } from '../Subject';\nimport { Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { refCount as higherOrderRefCount } from '../operators/refCount';\nvar ConnectableObservable = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ConnectableObservable, _super);\n    function ConnectableObservable(source, subjectFactory) {\n        var _this = _super.call(this) || this;\n        _this.source = source;\n        _this.subjectFactory = subjectFactory;\n        _this._refCount = 0;\n        _this._isComplete = false;\n        return _this;\n    }\n    ConnectableObservable.prototype._subscribe = function (subscriber) {\n        return this.getSubject().subscribe(subscriber);\n    };\n    ConnectableObservable.prototype.getSubject = function () {\n        var subject = this._subject;\n        if (!subject || subject.isStopped) {\n            this._subject = this.subjectFactory();\n        }\n        return this._subject;\n    };\n    ConnectableObservable.prototype.connect = function () {\n        var connection = this._connection;\n        if (!connection) {\n            this._isComplete = false;\n            connection = this._connection = new Subscription();\n            connection.add(this.source\n                .subscribe(new ConnectableSubscriber(this.getSubject(), this)));\n            if (connection.closed) {\n                this._connection = null;\n                connection = Subscription.EMPTY;\n            }\n        }\n        return connection;\n    };\n    ConnectableObservable.prototype.refCount = function () {\n        return higherOrderRefCount()(this);\n    };\n    return ConnectableObservable;\n}(Observable));\nexport { ConnectableObservable };\nexport var connectableObservableDescriptor = /*@__PURE__*/ (function () {\n    var connectableProto = ConnectableObservable.prototype;\n    return {\n        operator: { value: null },\n        _refCount: { value: 0, writable: true },\n        _subject: { value: null, writable: true },\n        _connection: { value: null, writable: true },\n        _subscribe: { value: connectableProto._subscribe },\n        _isComplete: { value: connectableProto._isComplete, writable: true },\n        getSubject: { value: connectableProto.getSubject },\n        connect: { value: connectableProto.connect },\n        refCount: { value: connectableProto.refCount }\n    };\n})();\nvar ConnectableSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ConnectableSubscriber, _super);\n    function ConnectableSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    ConnectableSubscriber.prototype._error = function (err) {\n        this._unsubscribe();\n        _super.prototype._error.call(this, err);\n    };\n    ConnectableSubscriber.prototype._complete = function () {\n        this.connectable._isComplete = true;\n        this._unsubscribe();\n        _super.prototype._complete.call(this);\n    };\n    ConnectableSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (connectable) {\n            this.connectable = null;\n            var connection = connectable._connection;\n            connectable._refCount = 0;\n            connectable._subject = null;\n            connectable._connection = null;\n            if (connection) {\n                connection.unsubscribe();\n            }\n        }\n    };\n    return ConnectableSubscriber;\n}(SubjectSubscriber));\nvar RefCountOperator = /*@__PURE__*/ (function () {\n    function RefCountOperator(connectable) {\n        this.connectable = connectable;\n    }\n    RefCountOperator.prototype.call = function (subscriber, source) {\n        var connectable = this.connectable;\n        connectable._refCount++;\n        var refCounter = new RefCountSubscriber(subscriber, connectable);\n        var subscription = source.subscribe(refCounter);\n        if (!refCounter.closed) {\n            refCounter.connection = connectable.connect();\n        }\n        return subscription;\n    };\n    return RefCountOperator;\n}());\nvar RefCountSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(RefCountSubscriber, _super);\n    function RefCountSubscriber(destination, connectable) {\n        var _this = _super.call(this, destination) || this;\n        _this.connectable = connectable;\n        return _this;\n    }\n    RefCountSubscriber.prototype._unsubscribe = function () {\n        var connectable = this.connectable;\n        if (!connectable) {\n            this.connection = null;\n            return;\n        }\n        this.connectable = null;\n        var refCount = connectable._refCount;\n        if (refCount <= 0) {\n            this.connection = null;\n            return;\n        }\n        connectable._refCount = refCount - 1;\n        if (refCount > 1) {\n            this.connection = null;\n            return;\n        }\n        var connection = this.connection;\n        var sharedConnection = connectable._connection;\n        this.connection = null;\n        if (sharedConnection && (!connection || sharedConnection === connection)) {\n            sharedConnection.unsubscribe();\n        }\n    };\n    return RefCountSubscriber;\n}(Subscriber));\n//# sourceMappingURL=ConnectableObservable.js.map\n","/** PURE_IMPORTS_START _observable_ConnectableObservable PURE_IMPORTS_END */\nimport { connectableObservableDescriptor } from '../observable/ConnectableObservable';\nexport function multicast(subjectOrSubjectFactory, selector) {\n    return function multicastOperatorFunction(source) {\n        var subjectFactory;\n        if (typeof subjectOrSubjectFactory === 'function') {\n            subjectFactory = subjectOrSubjectFactory;\n        }\n        else {\n            subjectFactory = function subjectFactory() {\n                return subjectOrSubjectFactory;\n            };\n        }\n        if (typeof selector === 'function') {\n            return source.lift(new MulticastOperator(subjectFactory, selector));\n        }\n        var connectable = Object.create(source, connectableObservableDescriptor);\n        connectable.source = source;\n        connectable.subjectFactory = subjectFactory;\n        return connectable;\n    };\n}\nvar MulticastOperator = /*@__PURE__*/ (function () {\n    function MulticastOperator(subjectFactory, selector) {\n        this.subjectFactory = subjectFactory;\n        this.selector = selector;\n    }\n    MulticastOperator.prototype.call = function (subscriber, source) {\n        var selector = this.selector;\n        var subject = this.subjectFactory();\n        var subscription = selector(subject).subscribe(subscriber);\n        subscription.add(source.subscribe(subject));\n        return subscription;\n    };\n    return MulticastOperator;\n}());\nexport { MulticastOperator };\n//# sourceMappingURL=multicast.js.map\n","/** PURE_IMPORTS_START _multicast,_refCount,_Subject PURE_IMPORTS_END */\nimport { multicast } from './multicast';\nimport { refCount } from './refCount';\nimport { Subject } from '../Subject';\nfunction shareSubjectFactory() {\n    return new Subject();\n}\nexport function share() {\n    return function (source) { return refCount()(multicast(shareSubjectFactory)(source)); };\n}\n//# sourceMappingURL=share.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, Subject, fromEvent } from \"rxjs\"\nimport { filter, map, share } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for window hash change events\n */\nconst hashchange$ = fromEvent<HashChangeEvent>(window, \"hashchange\")\n\n/**\n * Observable for window pop state events\n */\nconst popstate$ = fromEvent<PopStateEvent>(window, \"popstate\")\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch location\n *\n * @return Location subject\n */\nexport function watchLocation(): Subject<string> {\n  const location$ = new Subject<string>()\n  popstate$\n    .pipe(\n      map(() => location.href),\n      share()\n    )\n      .subscribe(location$)\n\n  /* Return subject */\n  return location$\n}\n\n/**\n * Watch location hash\n *\n * @return Location hash observable\n */\nexport function watchLocationHash(): Observable<string> {\n  return hashchange$\n    .pipe(\n      map(() => location.hash),\n      filter(hash => hash.length > 0),\n      share()\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEventPattern } from \"rxjs\"\nimport { shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch media query\n *\n * @param query - Media query\n *\n * @return Media observable\n */\nexport function watchMedia(query: string): Observable<boolean> {\n  const media = matchMedia(query)\n  return fromEventPattern<boolean>(next =>\n    media.addListener(() => next(media.matches))\n  )\n    .pipe(\n      startWith(media.matches),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START _Observable,_util_isArray,_util_isFunction,_operators_map PURE_IMPORTS_END */\nimport { Observable } from '../Observable';\nimport { isArray } from '../util/isArray';\nimport { isFunction } from '../util/isFunction';\nimport { map } from '../operators/map';\nexport function fromEventPattern(addHandler, removeHandler, resultSelector) {\n    if (resultSelector) {\n        return fromEventPattern(addHandler, removeHandler).pipe(map(function (args) { return isArray(args) ? resultSelector.apply(void 0, args) : resultSelector(args); }));\n    }\n    return new Observable(function (subscriber) {\n        var handler = function () {\n            var e = [];\n            for (var _i = 0; _i < arguments.length; _i++) {\n                e[_i] = arguments[_i];\n            }\n            return subscriber.next(e.length === 1 ? e[0] : e);\n        };\n        var retValue;\n        try {\n            retValue = addHandler(handler);\n        }\n        catch (err) {\n            subscriber.error(err);\n            return undefined;\n        }\n        if (!isFunction(removeHandler)) {\n            return undefined;\n        }\n        return function () { return removeHandler(handler, retValue); };\n    });\n}\n//# sourceMappingURL=fromEventPattern.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent, merge } from \"rxjs\"\nimport { map, shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Observable for window scroll events\n */\nconst scroll$ = fromEvent<UIEvent>(window, \"scroll\")\n\n/**\n * Observable for window resize events\n */\nconst resize$ = fromEvent<UIEvent>(window, \"resize\")\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Viewport offset\n */\nexport interface ViewportOffset {\n  x: number                            /* Horizontal offset */\n  y: number                            /* Vertical offset */\n}\n\n/**\n * Viewport size\n */\nexport interface ViewportSize {\n  width: number                        /* Viewport width */\n  height: number                       /* Viewport height */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Retrieve viewport offset\n *\n * @return Viewport offset\n */\nexport function getViewportOffset(): ViewportOffset {\n  return {\n    x: pageXOffset,\n    y: pageYOffset\n  }\n}\n\n/**\n * Retrieve viewport size\n *\n * @return Viewport size\n */\nexport function getViewportSize(): ViewportSize {\n  return {\n    width:  innerWidth,\n    height: innerHeight\n  }\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch viewport offset\n *\n * @return Viewport offset observable\n */\nexport function watchViewportOffset(): Observable<ViewportOffset> {\n  return merge(scroll$, resize$)\n    .pipe(\n      map(getViewportOffset),\n      startWith(getViewportOffset()),\n      shareReplay(1)\n    )\n}\n\n/**\n * Watch viewport size\n *\n * @return Viewport size observable\n */\nexport function watchViewportSize(): Observable<ViewportSize> {\n  return resize$\n    .pipe(\n      map(getViewportSize),\n      startWith(getViewportSize()),\n      shareReplay(1)\n    )\n}\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport var defaultThrottleConfig = {\n    leading: true,\n    trailing: false\n};\nexport function throttle(durationSelector, config) {\n    if (config === void 0) {\n        config = defaultThrottleConfig;\n    }\n    return function (source) { return source.lift(new ThrottleOperator(durationSelector, config.leading, config.trailing)); };\n}\nvar ThrottleOperator = /*@__PURE__*/ (function () {\n    function ThrottleOperator(durationSelector, leading, trailing) {\n        this.durationSelector = durationSelector;\n        this.leading = leading;\n        this.trailing = trailing;\n    }\n    ThrottleOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new ThrottleSubscriber(subscriber, this.durationSelector, this.leading, this.trailing));\n    };\n    return ThrottleOperator;\n}());\nvar ThrottleSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(ThrottleSubscriber, _super);\n    function ThrottleSubscriber(destination, durationSelector, _leading, _trailing) {\n        var _this = _super.call(this, destination) || this;\n        _this.destination = destination;\n        _this.durationSelector = durationSelector;\n        _this._leading = _leading;\n        _this._trailing = _trailing;\n        _this._hasValue = false;\n        return _this;\n    }\n    ThrottleSubscriber.prototype._next = function (value) {\n        this._hasValue = true;\n        this._sendValue = value;\n        if (!this._throttled) {\n            if (this._leading) {\n                this.send();\n            }\n            else {\n                this.throttle(value);\n            }\n        }\n    };\n    ThrottleSubscriber.prototype.send = function () {\n        var _a = this, _hasValue = _a._hasValue, _sendValue = _a._sendValue;\n        if (_hasValue) {\n            this.destination.next(_sendValue);\n            this.throttle(_sendValue);\n        }\n        this._hasValue = false;\n        this._sendValue = null;\n    };\n    ThrottleSubscriber.prototype.throttle = function (value) {\n        var duration = this.tryDurationSelector(value);\n        if (!!duration) {\n            this.add(this._throttled = subscribeToResult(this, duration));\n        }\n    };\n    ThrottleSubscriber.prototype.tryDurationSelector = function (value) {\n        try {\n            return this.durationSelector(value);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return null;\n        }\n    };\n    ThrottleSubscriber.prototype.throttlingDone = function () {\n        var _a = this, _throttled = _a._throttled, _trailing = _a._trailing;\n        if (_throttled) {\n            _throttled.unsubscribe();\n        }\n        this._throttled = null;\n        if (_trailing) {\n            this.send();\n        }\n    };\n    ThrottleSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.throttlingDone();\n    };\n    ThrottleSubscriber.prototype.notifyComplete = function () {\n        this.throttlingDone();\n    };\n    return ThrottleSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=throttle.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { pluck, share, switchMapTo, tap, throttle } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Worker message\n */\nexport interface WorkerMessage {\n  type: unknown                        /* Message type */\n  data: unknown                        /* Message data */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n *\n * @template T - Worker message type\n */\ninterface Options<T extends WorkerMessage> {\n  message$: Observable<T>              /* Message observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch a web worker\n *\n * This function returns an observable that will send all values emitted by the\n * message observable to the web worker. Web worker communication is expected\n * to be bidirectional (request-response) and synchronous. Messages that are\n * emitted during a pending request are throttled, the last one is emitted.\n *\n * @param worker - Web worker\n *\n * @return Worker message observable\n */\nexport function watchWorker<T extends WorkerMessage>(\n  worker: Worker, { message$: send$ }: Options<T>\n): Observable<T> {\n\n  /* Intercept messages from web worker */\n  const recv$ = fromEvent(worker, \"message\")\n    .pipe(\n      pluck<Event, T>(\"data\"),\n      share()\n    )\n\n  /* Send and receive messages, return hot observable */\n  return send$\n    .pipe(\n      throttle(() => recv$, { leading: true, trailing: true }),\n      tap(message => worker.postMessage(message)),\n      switchMapTo(recv$),\n      share()\n    )\n}\n","import _curry1 from './internal/_curry1.js';\nimport _isString from './internal/_isString.js';\n\n/**\n * Returns a new list or string with the elements or characters in reverse\n * order.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category List\n * @sig [a] -> [a]\n * @sig String -> String\n * @param {Array|String} list\n * @return {Array|String}\n * @example\n *\n *      R.reverse([1, 2, 3]);  //=> [3, 2, 1]\n *      R.reverse([1, 2]);     //=> [2, 1]\n *      R.reverse([1]);        //=> [1]\n *      R.reverse([]);         //=> []\n *\n *      R.reverse('abc');      //=> 'cba'\n *      R.reverse('ab');       //=> 'ba'\n *      R.reverse('a');        //=> 'a'\n *      R.reverse('');         //=> ''\n */\nvar reverse = /*#__PURE__*/_curry1(function reverse(list) {\n  return _isString(list) ? list.split('').reverse().join('') : Array.prototype.slice.call(list, 0).reverse();\n});\nexport default reverse;","export default function _isString(x) {\n  return Object.prototype.toString.call(x) === '[object String]';\n}","import _curry1 from './_curry1.js';\nimport _isPlaceholder from './_isPlaceholder.js';\n\n/**\n * Optimized internal two-arity curry function.\n *\n * @private\n * @category Function\n * @param {Function} fn The function to curry.\n * @return {Function} The curried function.\n */\nexport default function _curry2(fn) {\n  return function f2(a, b) {\n    switch (arguments.length) {\n      case 0:\n        return f2;\n      case 1:\n        return _isPlaceholder(a) ? f2 : _curry1(function (_b) {\n          return fn(a, _b);\n        });\n      default:\n        return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {\n          return fn(_a, b);\n        }) : _isPlaceholder(b) ? _curry1(function (_b) {\n          return fn(a, _b);\n        }) : fn(a, b);\n    }\n  };\n}","export default function _arrayFromIterator(iter) {\n  var list = [];\n  var next;\n  while (!(next = iter.next()).done) {\n    list.push(next.value);\n  }\n  return list;\n}","export default function _includesWith(pred, x, list) {\n  var idx = 0;\n  var len = list.length;\n\n  while (idx < len) {\n    if (pred(x, list[idx])) {\n      return true;\n    }\n    idx += 1;\n  }\n  return false;\n}","// Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is\nfunction _objectIs(a, b) {\n  // SameValue algorithm\n  if (a === b) {\n    // Steps 1-5, 7-10\n    // Steps 6.b-6.e: +0 != -0\n    return a !== 0 || 1 / a === 1 / b;\n  } else {\n    // Step 6.a: NaN == NaN\n    return a !== a && b !== b;\n  }\n}\n\nexport default typeof Object.is === 'function' ? Object.is : _objectIs;","import _curry1 from './internal/_curry1.js';\n\n/**\n * Gives a single-word string description of the (native) type of a value,\n * returning such answers as 'Object', 'Number', 'Array', or 'Null'. Does not\n * attempt to distinguish user Object types any further, reporting them all as\n * 'Object'.\n *\n * @func\n * @memberOf R\n * @since v0.8.0\n * @category Type\n * @sig (* -> {*}) -> String\n * @param {*} val The value to test\n * @return {String}\n * @example\n *\n *      R.type({}); //=> \"Object\"\n *      R.type(1); //=> \"Number\"\n *      R.type(false); //=> \"Boolean\"\n *      R.type('s'); //=> \"String\"\n *      R.type(null); //=> \"Null\"\n *      R.type([]); //=> \"Array\"\n *      R.type(/[A-z]/); //=> \"RegExp\"\n *      R.type(() => {}); //=> \"Function\"\n *      R.type(undefined); //=> \"Undefined\"\n */\nvar type = /*#__PURE__*/_curry1(function type(val) {\n  return val === null ? 'Null' : val === undefined ? 'Undefined' : Object.prototype.toString.call(val).slice(8, -1);\n});\nexport default type;","import _arrayFromIterator from './_arrayFromIterator.js';\nimport _includesWith from './_includesWith.js';\nimport _functionName from './_functionName.js';\nimport _has from './_has.js';\nimport _objectIs from './_objectIs.js';\nimport keys from '../keys.js';\nimport type from '../type.js';\n\n/**\n * private _uniqContentEquals function.\n * That function is checking equality of 2 iterator contents with 2 assumptions\n * - iterators lengths are the same\n * - iterators values are unique\n *\n * false-positive result will be returned for comparision of, e.g.\n * - [1,2,3] and [1,2,3,4]\n * - [1,1,1] and [1,2,3]\n * */\n\nfunction _uniqContentEquals(aIterator, bIterator, stackA, stackB) {\n  var a = _arrayFromIterator(aIterator);\n  var b = _arrayFromIterator(bIterator);\n\n  function eq(_a, _b) {\n    return _equals(_a, _b, stackA.slice(), stackB.slice());\n  }\n\n  // if *a* array contains any element that is not included in *b*\n  return !_includesWith(function (b, aItem) {\n    return !_includesWith(eq, aItem, b);\n  }, b, a);\n}\n\nexport default function _equals(a, b, stackA, stackB) {\n  if (_objectIs(a, b)) {\n    return true;\n  }\n\n  var typeA = type(a);\n\n  if (typeA !== type(b)) {\n    return false;\n  }\n\n  if (a == null || b == null) {\n    return false;\n  }\n\n  if (typeof a['fantasy-land/equals'] === 'function' || typeof b['fantasy-land/equals'] === 'function') {\n    return typeof a['fantasy-land/equals'] === 'function' && a['fantasy-land/equals'](b) && typeof b['fantasy-land/equals'] === 'function' && b['fantasy-land/equals'](a);\n  }\n\n  if (typeof a.equals === 'function' || typeof b.equals === 'function') {\n    return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);\n  }\n\n  switch (typeA) {\n    case 'Arguments':\n    case 'Array':\n    case 'Object':\n      if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {\n        return a === b;\n      }\n      break;\n    case 'Boolean':\n    case 'Number':\n    case 'String':\n      if (!(typeof a === typeof b && _objectIs(a.valueOf(), b.valueOf()))) {\n        return false;\n      }\n      break;\n    case 'Date':\n      if (!_objectIs(a.valueOf(), b.valueOf())) {\n        return false;\n      }\n      break;\n    case 'Error':\n      return a.name === b.name && a.message === b.message;\n    case 'RegExp':\n      if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {\n        return false;\n      }\n      break;\n  }\n\n  var idx = stackA.length - 1;\n  while (idx >= 0) {\n    if (stackA[idx] === a) {\n      return stackB[idx] === b;\n    }\n    idx -= 1;\n  }\n\n  switch (typeA) {\n    case 'Map':\n      if (a.size !== b.size) {\n        return false;\n      }\n\n      return _uniqContentEquals(a.entries(), b.entries(), stackA.concat([a]), stackB.concat([b]));\n    case 'Set':\n      if (a.size !== b.size) {\n        return false;\n      }\n\n      return _uniqContentEquals(a.values(), b.values(), stackA.concat([a]), stackB.concat([b]));\n    case 'Arguments':\n    case 'Array':\n    case 'Object':\n    case 'Boolean':\n    case 'Number':\n    case 'String':\n    case 'Date':\n    case 'Error':\n    case 'RegExp':\n    case 'Int8Array':\n    case 'Uint8Array':\n    case 'Uint8ClampedArray':\n    case 'Int16Array':\n    case 'Uint16Array':\n    case 'Int32Array':\n    case 'Uint32Array':\n    case 'Float32Array':\n    case 'Float64Array':\n    case 'ArrayBuffer':\n      break;\n    default:\n      // Values of other types are only equal if identical.\n      return false;\n  }\n\n  var keysA = keys(a);\n  if (keysA.length !== keys(b).length) {\n    return false;\n  }\n\n  var extendedStackA = stackA.concat([a]);\n  var extendedStackB = stackB.concat([b]);\n\n  idx = keysA.length - 1;\n  while (idx >= 0) {\n    var key = keysA[idx];\n    if (!(_has(key, b) && _equals(b[key], a[key], extendedStackA, extendedStackB))) {\n      return false;\n    }\n    idx -= 1;\n  }\n  return true;\n}","export default function _functionName(f) {\n  // String(x => x) evaluates to \"x => x\", so the pattern may not match.\n  var match = String(f).match(/^function (\\w*)/);\n  return match == null ? '' : match[1];\n}","import _curry2 from './internal/_curry2.js';\nimport _equals from './internal/_equals.js';\n\n/**\n * Returns `true` if its arguments are equivalent, `false` otherwise. Handles\n * cyclical data structures.\n *\n * Dispatches symmetrically to the `equals` methods of both arguments, if\n * present.\n *\n * @func\n * @memberOf R\n * @since v0.15.0\n * @category Relation\n * @sig a -> b -> Boolean\n * @param {*} a\n * @param {*} b\n * @return {Boolean}\n * @example\n *\n *      R.equals(1, 1); //=> true\n *      R.equals(1, '1'); //=> false\n *      R.equals([1, 2, 3], [1, 2, 3]); //=> true\n *\n *      const a = {}; a.v = a;\n *      const b = {}; b.v = b;\n *      R.equals(a, b); //=> true\n */\nvar equals = /*#__PURE__*/_curry2(function equals(a, b) {\n  return _equals(a, b, [], []);\n});\nexport default equals;","import _indexOf from './_indexOf.js';\n\nexport default function _includes(a, list) {\n  return _indexOf(list, a, 0) >= 0;\n}","import equals from '../equals.js';\n\nexport default function _indexOf(list, a, idx) {\n  var inf, item;\n  // Array.prototype.indexOf doesn't exist below IE9\n  if (typeof list.indexOf === 'function') {\n    switch (typeof a) {\n      case 'number':\n        if (a === 0) {\n          // manually crawl the list to distinguish between +0 and -0\n          inf = 1 / a;\n          while (idx < list.length) {\n            item = list[idx];\n            if (item === 0 && 1 / item === inf) {\n              return idx;\n            }\n            idx += 1;\n          }\n          return -1;\n        } else if (a !== a) {\n          // NaN\n          while (idx < list.length) {\n            item = list[idx];\n            if (typeof item === 'number' && item !== item) {\n              return idx;\n            }\n            idx += 1;\n          }\n          return -1;\n        }\n        // non-zero numbers can utilise Set\n        return list.indexOf(a, idx);\n\n      // all these types can utilise Set\n      case 'string':\n      case 'boolean':\n      case 'function':\n      case 'undefined':\n        return list.indexOf(a, idx);\n\n      case 'object':\n        if (a === null) {\n          // null can utilise Set\n          return list.indexOf(a, idx);\n        }\n    }\n  }\n  // anything else not covered above, defer to R.equals\n  while (idx < list.length) {\n    if (equals(list[idx], a)) {\n      return idx;\n    }\n    idx += 1;\n  }\n  return -1;\n}","import _includes from './_includes.js';\n\nvar _Set = /*#__PURE__*/function () {\n  function _Set() {\n    /* globals Set */\n    this._nativeSet = typeof Set === 'function' ? new Set() : null;\n    this._items = {};\n  }\n\n  // until we figure out why jsdoc chokes on this\n  // @param item The item to add to the Set\n  // @returns {boolean} true if the item did not exist prior, otherwise false\n  //\n  _Set.prototype.add = function (item) {\n    return !hasOrAdd(item, true, this);\n  };\n\n  //\n  // @param item The item to check for existence in the Set\n  // @returns {boolean} true if the item exists in the Set, otherwise false\n  //\n  _Set.prototype.has = function (item) {\n    return hasOrAdd(item, false, this);\n  };\n\n  //\n  // Combines the logic for checking whether an item is a member of the set and\n  // for adding a new item to the set.\n  //\n  // @param item       The item to check or add to the Set instance.\n  // @param shouldAdd  If true, the item will be added to the set if it doesn't\n  //                   already exist.\n  // @param set        The set instance to check or add to.\n  // @return {boolean} true if the item already existed, otherwise false.\n  //\n  return _Set;\n}();\n\nfunction hasOrAdd(item, shouldAdd, set) {\n  var type = typeof item;\n  var prevSize, newSize;\n  switch (type) {\n    case 'string':\n    case 'number':\n      // distinguish between +0 and -0\n      if (item === 0 && 1 / item === -Infinity) {\n        if (set._items['-0']) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items['-0'] = true;\n          }\n          return false;\n        }\n      }\n      // these types can all utilise the native Set\n      if (set._nativeSet !== null) {\n        if (shouldAdd) {\n          prevSize = set._nativeSet.size;\n          set._nativeSet.add(item);\n          newSize = set._nativeSet.size;\n          return newSize === prevSize;\n        } else {\n          return set._nativeSet.has(item);\n        }\n      } else {\n        if (!(type in set._items)) {\n          if (shouldAdd) {\n            set._items[type] = {};\n            set._items[type][item] = true;\n          }\n          return false;\n        } else if (item in set._items[type]) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items[type][item] = true;\n          }\n          return false;\n        }\n      }\n\n    case 'boolean':\n      // set._items['boolean'] holds a two element array\n      // representing [ falseExists, trueExists ]\n      if (type in set._items) {\n        var bIdx = item ? 1 : 0;\n        if (set._items[type][bIdx]) {\n          return true;\n        } else {\n          if (shouldAdd) {\n            set._items[type][bIdx] = true;\n          }\n          return false;\n        }\n      } else {\n        if (shouldAdd) {\n          set._items[type] = item ? [false, true] : [true, false];\n        }\n        return false;\n      }\n\n    case 'function':\n      // compare functions for reference equality\n      if (set._nativeSet !== null) {\n        if (shouldAdd) {\n          prevSize = set._nativeSet.size;\n          set._nativeSet.add(item);\n          newSize = set._nativeSet.size;\n          return newSize === prevSize;\n        } else {\n          return set._nativeSet.has(item);\n        }\n      } else {\n        if (!(type in set._items)) {\n          if (shouldAdd) {\n            set._items[type] = [item];\n          }\n          return false;\n        }\n        if (!_includes(item, set._items[type])) {\n          if (shouldAdd) {\n            set._items[type].push(item);\n          }\n          return false;\n        }\n        return true;\n      }\n\n    case 'undefined':\n      if (set._items[type]) {\n        return true;\n      } else {\n        if (shouldAdd) {\n          set._items[type] = true;\n        }\n        return false;\n      }\n\n    case 'object':\n      if (item === null) {\n        if (!set._items['null']) {\n          if (shouldAdd) {\n            set._items['null'] = true;\n          }\n          return false;\n        }\n        return true;\n      }\n    /* falls through */\n    default:\n      // reduce the search size of heterogeneous sets by creating buckets\n      // for each type.\n      type = Object.prototype.toString.call(item);\n      if (!(type in set._items)) {\n        if (shouldAdd) {\n          set._items[type] = [item];\n        }\n        return false;\n      }\n      // scan through all previously applied items\n      if (!_includes(item, set._items[type])) {\n        if (shouldAdd) {\n          set._items[type].push(item);\n        }\n        return false;\n      }\n      return true;\n  }\n}\n\n// A simple Set type that honours R.equals semantics\nexport default _Set;","import _curry2 from './internal/_curry2.js';\nimport _Set from './internal/_Set.js';\n\n/**\n * Finds the set (i.e. no duplicates) of all elements in the first list not\n * contained in the second list. Objects and Arrays are compared in terms of\n * value equality, not reference equality.\n *\n * @func\n * @memberOf R\n * @since v0.1.0\n * @category Relation\n * @sig [*] -> [*] -> [*]\n * @param {Array} list1 The first list.\n * @param {Array} list2 The second list.\n * @return {Array} The elements in `list1` that are not in `list2`.\n * @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith, R.without\n * @example\n *\n *      R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]\n *      R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]\n *      R.difference([{a: 1}, {b: 2}], [{a: 1}, {c: 3}]) //=> [{b: 2}]\n */\nvar difference = /*#__PURE__*/_curry2(function difference(first, second) {\n  var out = [];\n  var idx = 0;\n  var firstLen = first.length;\n  var secondLen = second.length;\n  var toFilterOut = new _Set();\n\n  for (var i = 0; i < secondLen; i += 1) {\n    toFilterOut.add(second[i]);\n  }\n\n  while (idx < firstLen) {\n    if (toFilterOut.add(first[idx])) {\n      out[out.length] = first[idx];\n    }\n    idx += 1;\n  }\n  return out;\n});\nexport default difference;","/** PURE_IMPORTS_START tslib,_util_isScheduler,_util_isArray,_OuterSubscriber,_util_subscribeToResult,_fromArray PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { isScheduler } from '../util/isScheduler';\nimport { isArray } from '../util/isArray';\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nimport { fromArray } from './fromArray';\nvar NONE = {};\nexport function combineLatest() {\n    var observables = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        observables[_i] = arguments[_i];\n    }\n    var resultSelector = null;\n    var scheduler = null;\n    if (isScheduler(observables[observables.length - 1])) {\n        scheduler = observables.pop();\n    }\n    if (typeof observables[observables.length - 1] === 'function') {\n        resultSelector = observables.pop();\n    }\n    if (observables.length === 1 && isArray(observables[0])) {\n        observables = observables[0];\n    }\n    return fromArray(observables, scheduler).lift(new CombineLatestOperator(resultSelector));\n}\nvar CombineLatestOperator = /*@__PURE__*/ (function () {\n    function CombineLatestOperator(resultSelector) {\n        this.resultSelector = resultSelector;\n    }\n    CombineLatestOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new CombineLatestSubscriber(subscriber, this.resultSelector));\n    };\n    return CombineLatestOperator;\n}());\nexport { CombineLatestOperator };\nvar CombineLatestSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(CombineLatestSubscriber, _super);\n    function CombineLatestSubscriber(destination, resultSelector) {\n        var _this = _super.call(this, destination) || this;\n        _this.resultSelector = resultSelector;\n        _this.active = 0;\n        _this.values = [];\n        _this.observables = [];\n        return _this;\n    }\n    CombineLatestSubscriber.prototype._next = function (observable) {\n        this.values.push(NONE);\n        this.observables.push(observable);\n    };\n    CombineLatestSubscriber.prototype._complete = function () {\n        var observables = this.observables;\n        var len = observables.length;\n        if (len === 0) {\n            this.destination.complete();\n        }\n        else {\n            this.active = len;\n            this.toRespond = len;\n            for (var i = 0; i < len; i++) {\n                var observable = observables[i];\n                this.add(subscribeToResult(this, observable, observable, i));\n            }\n        }\n    };\n    CombineLatestSubscriber.prototype.notifyComplete = function (unused) {\n        if ((this.active -= 1) === 0) {\n            this.destination.complete();\n        }\n    };\n    CombineLatestSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        var values = this.values;\n        var oldVal = values[outerIndex];\n        var toRespond = !this.toRespond\n            ? 0\n            : oldVal === NONE ? --this.toRespond : this.toRespond;\n        values[outerIndex] = innerValue;\n        if (toRespond === 0) {\n            if (this.resultSelector) {\n                this._tryResultSelector(values);\n            }\n            else {\n                this.destination.next(values.slice());\n            }\n        }\n    };\n    CombineLatestSubscriber.prototype._tryResultSelector = function (values) {\n        var result;\n        try {\n            result = this.resultSelector.apply(this, values);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return CombineLatestSubscriber;\n}(OuterSubscriber));\nexport { CombineLatestSubscriber };\n//# sourceMappingURL=combineLatest.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncAction PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncAction } from './AsyncAction';\nvar AnimationFrameAction = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnimationFrameAction, _super);\n    function AnimationFrameAction(scheduler, work) {\n        var _this = _super.call(this, scheduler, work) || this;\n        _this.scheduler = scheduler;\n        _this.work = work;\n        return _this;\n    }\n    AnimationFrameAction.prototype.requestAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if (delay !== null && delay > 0) {\n            return _super.prototype.requestAsyncId.call(this, scheduler, id, delay);\n        }\n        scheduler.actions.push(this);\n        return scheduler.scheduled || (scheduler.scheduled = requestAnimationFrame(function () { return scheduler.flush(null); }));\n    };\n    AnimationFrameAction.prototype.recycleAsyncId = function (scheduler, id, delay) {\n        if (delay === void 0) {\n            delay = 0;\n        }\n        if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {\n            return _super.prototype.recycleAsyncId.call(this, scheduler, id, delay);\n        }\n        if (scheduler.actions.length === 0) {\n            cancelAnimationFrame(id);\n            scheduler.scheduled = undefined;\n        }\n        return undefined;\n    };\n    return AnimationFrameAction;\n}(AsyncAction));\nexport { AnimationFrameAction };\n//# sourceMappingURL=AnimationFrameAction.js.map\n","/** PURE_IMPORTS_START _AnimationFrameAction,_AnimationFrameScheduler PURE_IMPORTS_END */\nimport { AnimationFrameAction } from './AnimationFrameAction';\nimport { AnimationFrameScheduler } from './AnimationFrameScheduler';\nexport var animationFrame = /*@__PURE__*/ new AnimationFrameScheduler(AnimationFrameAction);\n//# sourceMappingURL=animationFrame.js.map\n","/** PURE_IMPORTS_START tslib,_AsyncScheduler PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { AsyncScheduler } from './AsyncScheduler';\nvar AnimationFrameScheduler = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(AnimationFrameScheduler, _super);\n    function AnimationFrameScheduler() {\n        return _super !== null && _super.apply(this, arguments) || this;\n    }\n    AnimationFrameScheduler.prototype.flush = function (action) {\n        this.active = true;\n        this.scheduled = undefined;\n        var actions = this.actions;\n        var error;\n        var index = -1;\n        var count = actions.length;\n        action = action || actions.shift();\n        do {\n            if (error = action.execute(action.state, action.delay)) {\n                break;\n            }\n        } while (++index < count && (action = actions.shift()));\n        this.active = false;\n        if (error) {\n            while (++index < count && (action = actions.shift())) {\n                action.unsubscribe();\n            }\n            throw error;\n        }\n    };\n    return AnimationFrameScheduler;\n}(AsyncScheduler));\nexport { AnimationFrameScheduler };\n//# sourceMappingURL=AnimationFrameScheduler.js.map\n","/** PURE_IMPORTS_START tslib,_Subscriber,_Subscription PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nexport function finalize(callback) {\n    return function (source) { return source.lift(new FinallyOperator(callback)); };\n}\nvar FinallyOperator = /*@__PURE__*/ (function () {\n    function FinallyOperator(callback) {\n        this.callback = callback;\n    }\n    FinallyOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new FinallySubscriber(subscriber, this.callback));\n    };\n    return FinallyOperator;\n}());\nvar FinallySubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(FinallySubscriber, _super);\n    function FinallySubscriber(destination, callback) {\n        var _this = _super.call(this, destination) || this;\n        _this.add(new Subscription(callback));\n        return _this;\n    }\n    return FinallySubscriber;\n}(Subscriber));\n//# sourceMappingURL=finalize.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set anchor blur\n *\n * @param el - Anchor element\n * @param value - Whether the anchor is blurred\n */\nexport function setAnchorBlur(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"blur\" : \"\")\n}\n\n/**\n * Reset anchor blur\n *\n * @param el - Anchor element\n */\nexport function resetAnchorBlur(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Set anchor active\n *\n * @param el - Anchor element\n * @param value - Whether the anchor is active\n */\nexport function setAnchorActive(\n  el: HTMLElement, value: boolean\n): void {\n  el.classList.toggle(\"md-nav__link--active\", value)\n}\n\n/**\n * Reset anchor active\n *\n * @param el - Anchor element\n */\nexport function resetAnchorActive(\n  el: HTMLElement\n): void {\n  el.classList.remove(\"md-nav__link--active\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set hidden\n *\n * @param el - Hideable element\n * @param value - Whether the element is hidden\n */\nexport function setHidden(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"hidden\" : \"\")\n}\n\n/**\n * Reset hidden\n *\n * @param el - Hideable element\n */\nexport function resetHidden(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set sidebar height\n *\n * @param el - Sidebar element\n * @param value - Sidebar height\n */\nexport function setSidebarHeight(\n  el: HTMLElement, value: number\n): void {\n  el.style.height = `${value}px`\n}\n\n/**\n * Reset sidebar height\n *\n * @param el - Sidebar element\n */\nexport function resetSidebarHeight(\n  el: HTMLElement\n): void {\n  el.style.height = \"\"\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Set sidebar lock\n *\n * @param el - Sidebar element\n * @param value - Whether the sidebar is locked\n */\nexport function setSidebarLock(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"lock\" : \"\")\n}\n\n/**\n * Reset sidebar lock\n *\n * @param el - Sidebar element\n */\nexport function resetSidebarLock(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set overflow scrolling\n *\n * @param el - Scrollable element\n */\nexport function setOverflowScrolling(\n  el: HTMLElement\n): void {\n  el.style.backgroundColor = \"yellow\" // TODO: debugging\n  el.style.webkitOverflowScrolling = \"touch\"\n}\n\n/**\n * Reset overflow scrolling\n *\n * @param el - Scrollable element\n */\nexport function resetOverflowScrolling(\n  el: HTMLElement\n): void {\n  el.style.backgroundColor = \"\" // TODO: debugging\n  el.style.webkitOverflowScrolling = \"\"\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { JSX as JSXInternal } from \"preact\"\nimport { keys } from \"ramda\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * HTML attributes\n */\ntype Attributes =\n  & JSXInternal.HTMLAttributes\n  & JSXInternal.SVGAttributes\n  & Record<string, any>\n\n/**\n * Child element\n */\ntype Child = Child[] | HTMLElement | Text | string | number\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Append a child node to an element\n *\n * @param el - HTML element\n * @param child - Child node\n */\nfunction appendChild(el: HTMLElement, child: Child): void {\n\n  /* Handle primitive types (including raw HTML) */\n  if (typeof child === \"string\" || typeof child === \"number\") {\n    el.innerHTML += child.toString()\n\n  /* Handle nodes */\n  } else if (child instanceof Node) {\n    el.appendChild(child)\n\n  /* Handle nested children */\n  } else if (Array.isArray(child)) {\n    for (const node of child)\n      appendChild(el, node)\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * JSX factory\n *\n * @param tag - HTML tag\n * @param attributes - HTML attributes\n * @param children - Child elements\n *\n * @return HTML element\n */\nexport function h(\n  tag: string, attributes: Attributes | null,\n  ...children: Array<HTMLElement | Text | string | number>\n): HTMLElement {\n  const el = document.createElement(tag)\n\n  /* Set attributes, if any */\n  if (attributes)\n    for (const attr of keys(attributes))\n      if (typeof attributes[attr] !== \"boolean\")\n        el.setAttribute(attr, attributes[attr])\n      else if (attributes[attr])\n        el.setAttribute(attr, \"\")\n\n  /* Append child nodes */\n  for (const child of children)\n    appendChild(el, child)\n\n  /* Return element */\n  return el\n}\n\n/* ----------------------------------------------------------------------------\n * Namespace\n * ------------------------------------------------------------------------- */\n\nexport declare namespace h {\n  namespace JSX {\n    type Element = HTMLElement\n    type IntrinsicElements = JSXInternal.IntrinsicElements\n  }\n}\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport function takeUntil(notifier) {\n    return function (source) { return source.lift(new TakeUntilOperator(notifier)); };\n}\nvar TakeUntilOperator = /*@__PURE__*/ (function () {\n    function TakeUntilOperator(notifier) {\n        this.notifier = notifier;\n    }\n    TakeUntilOperator.prototype.call = function (subscriber, source) {\n        var takeUntilSubscriber = new TakeUntilSubscriber(subscriber);\n        var notifierSubscription = subscribeToResult(takeUntilSubscriber, this.notifier);\n        if (notifierSubscription && !takeUntilSubscriber.seenValue) {\n            takeUntilSubscriber.add(notifierSubscription);\n            return source.subscribe(takeUntilSubscriber);\n        }\n        return takeUntilSubscriber;\n    };\n    return TakeUntilOperator;\n}());\nvar TakeUntilSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(TakeUntilSubscriber, _super);\n    function TakeUntilSubscriber(destination) {\n        var _this = _super.call(this, destination) || this;\n        _this.seenValue = false;\n        return _this;\n    }\n    TakeUntilSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.seenValue = true;\n        this.complete();\n    };\n    TakeUntilSubscriber.prototype.notifyComplete = function () {\n    };\n    return TakeUntilSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=takeUntil.js.map\n","/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */\nimport * as tslib_1 from \"tslib\";\nimport { OuterSubscriber } from '../OuterSubscriber';\nimport { subscribeToResult } from '../util/subscribeToResult';\nexport function withLatestFrom() {\n    var args = [];\n    for (var _i = 0; _i < arguments.length; _i++) {\n        args[_i] = arguments[_i];\n    }\n    return function (source) {\n        var project;\n        if (typeof args[args.length - 1] === 'function') {\n            project = args.pop();\n        }\n        var observables = args;\n        return source.lift(new WithLatestFromOperator(observables, project));\n    };\n}\nvar WithLatestFromOperator = /*@__PURE__*/ (function () {\n    function WithLatestFromOperator(observables, project) {\n        this.observables = observables;\n        this.project = project;\n    }\n    WithLatestFromOperator.prototype.call = function (subscriber, source) {\n        return source.subscribe(new WithLatestFromSubscriber(subscriber, this.observables, this.project));\n    };\n    return WithLatestFromOperator;\n}());\nvar WithLatestFromSubscriber = /*@__PURE__*/ (function (_super) {\n    tslib_1.__extends(WithLatestFromSubscriber, _super);\n    function WithLatestFromSubscriber(destination, observables, project) {\n        var _this = _super.call(this, destination) || this;\n        _this.observables = observables;\n        _this.project = project;\n        _this.toRespond = [];\n        var len = observables.length;\n        _this.values = new Array(len);\n        for (var i = 0; i < len; i++) {\n            _this.toRespond.push(i);\n        }\n        for (var i = 0; i < len; i++) {\n            var observable = observables[i];\n            _this.add(subscribeToResult(_this, observable, observable, i));\n        }\n        return _this;\n    }\n    WithLatestFromSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {\n        this.values[outerIndex] = innerValue;\n        var toRespond = this.toRespond;\n        if (toRespond.length > 0) {\n            var found = toRespond.indexOf(outerIndex);\n            if (found !== -1) {\n                toRespond.splice(found, 1);\n            }\n        }\n    };\n    WithLatestFromSubscriber.prototype.notifyComplete = function () {\n    };\n    WithLatestFromSubscriber.prototype._next = function (value) {\n        if (this.toRespond.length === 0) {\n            var args = [value].concat(this.values);\n            if (this.project) {\n                this._tryProject(args);\n            }\n            else {\n                this.destination.next(args);\n            }\n        }\n    };\n    WithLatestFromSubscriber.prototype._tryProject = function (args) {\n        var result;\n        try {\n            result = this.project.apply(this, args);\n        }\n        catch (err) {\n            this.destination.error(err);\n            return;\n        }\n        this.destination.next(result);\n    };\n    return WithLatestFromSubscriber;\n}(OuterSubscriber));\n//# sourceMappingURL=withLatestFrom.js.map\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { getElement } from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Translations\n */\nlet lang: Record<string, string>\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Translate the given key\n *\n * @param key - Key to be translated\n * @param value - Value to be replaced\n *\n * @return Translation\n */\nexport function translate(key: string, value?: string): string {\n  if (typeof lang === \"undefined\") {\n    const el = getElement(\"#__lang\")!\n    lang = JSON.parse(el.innerText)\n  }\n  if (typeof lang[key] === \"undefined\") {\n    throw new ReferenceError(`Invalid translation: ${key}`)\n  }\n  return typeof value !== \"undefined\"\n    ? lang[key].replace(\"#\", value)\n    : lang[key]\n}\n\n/**\n * Truncate a string after the given number of characters\n *\n * @param value - Value to be truncated\n * @param n - Number of characters\n *\n * @return Truncated value\n */\nexport function truncate(value: string, n: number): string {\n  let i = n\n  if (value.length > i) {\n    while (value[i] !== \" \" && --i > 0); // tslint:disable-line\n    return `${value.substring(0, i)}...`\n  }\n  return value\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  EMPTY,\n  MonoTypeOperatorFunction,\n  Observable,\n  OperatorFunction,\n  combineLatest,\n  of,\n  pipe\n} from \"rxjs\"\nimport {\n  filter,\n  map,\n  switchMap,\n  takeUntil,\n  withLatestFrom\n} from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Toggle switch map with another observable\n *\n * @template T - Source value type\n * @template U - Target value type\n *\n * @param toggle$ - Toggle observable\n * @param project - Projection\n *\n * @return Operator function\n */\nexport function switchMapIf<T, U>(\n  toggle$: Observable<boolean>, project: (value: T) => Observable<U>\n): OperatorFunction<T, U> {\n  const begin$ = toggle$.pipe(filter(value =>  value))\n  const end$   = toggle$.pipe(filter(value => !value))\n  return pipe(\n    switchMap(value => combineLatest([of(value), begin$])),\n    switchMap(([value, active]) => active\n      ? project(value)\n          .pipe(\n            takeUntil(end$)\n          )\n      : EMPTY\n    )\n  )\n}\n\n/**\n * Toggle emission with another observable\n *\n * @template T - Value type\n *\n * @param toggle$ - Toggle observable\n *\n * @return Operator function\n */\nexport function takeIf<T>(\n  toggle$: Observable<boolean>\n): MonoTypeOperatorFunction<T> {\n  return pipe(\n    withLatestFrom(toggle$),\n    filter(([, active]) => active),\n    map(([value]) => value)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { translate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set number of search results\n *\n * @param el - Search result metadata element\n * @param value - Number of results\n */\nexport function setSearchResultMeta(\n  el: HTMLElement, value: number\n): void {\n  switch (value) {\n\n    /* No results */\n    case 0:\n      el.textContent = translate(\"search.result.none\")\n      break\n\n    /* One result */\n    case 1:\n      el.textContent = translate(\"search.result.one\")\n      break\n\n    /* Multiple result */\n    default:\n      el.textContent = translate(\"search.result.other\", value.toString())\n  }\n}\n\n/**\n * Reset number of search results\n *\n * @param el - Search result metadata element\n */\nexport function resetSearchResultMeta(\n  el: HTMLElement\n): void {\n  el.textContent = translate(\"search.result.placeholder\")\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Add an element to the search result list\n *\n * @param el - Search result list element\n * @param child - Search result element\n */\nexport function addToSearchResultList(\n  el: HTMLElement, child: HTMLElement\n): void {\n  el.appendChild(child)\n}\n\n/**\n * Reset search result list\n *\n * @param el - Search result list element\n */\nexport function resetSearchResultList(\n  el: HTMLElement\n): void {\n  el.innerHTML = \"\"\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, of } from \"rxjs\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Header\n */\nexport interface Header {\n  sticky: boolean                      /* Header stickyness */\n  height: number                       /* Header visible height */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch header\n *\n * The header is wrapped in an observable to pave the way for auto-hiding or\n * other dynamic behaviors that may be implemented later on.\n *\n * @param el - Header element\n *\n * @return Header observable\n */\nexport function watchHeader(\n  el: HTMLElement\n): Observable<Header> {\n  const styles = getComputedStyle(el)\n  const sticky = styles.position === \"sticky\"\n  return of({\n    sticky,\n    height: sticky ? el.offsetHeight : 0\n  })\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { equals } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  combineLatest,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  observeOn,\n  shareReplay,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetSidebarHeight,\n  resetSidebarLock,\n  setSidebarHeight,\n  setSidebarLock\n} from \"actions\"\n\nimport { ViewportOffset } from \"../../agent\"\nimport { Main } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Sidebar\n */\nexport interface Sidebar {\n  height: number                       /* Sidebar height */\n  lock: boolean                        /* Sidebar lock */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  main$: Observable<Main>              /* Main area observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch sidebar\n *\n * This function returns an observable that computes the visual parameters of\n * the sidebar which depends on the vertical viewport offset, as well as the\n * height of the main area. When the page is scrolled beyond the header, the\n * sidebar is locked and fills the remaining space.\n *\n * @param el - Sidebar element\n * @param options - Options\n *\n * @return Sidebar observable\n */\nexport function watchSidebar(\n  el: HTMLElement, { main$, offset$ }: Options\n): Observable<Sidebar> {\n\n  /* Adjust for internal main area offset */\n  const adjust = parseFloat(\n    getComputedStyle(el.parentElement!)\n      .getPropertyValue(\"padding-top\")\n  )\n\n  /* Compute the sidebar's available height */\n  const height$ = combineLatest([offset$, main$])\n    .pipe(\n      map(([{ y }, { offset, height }]) => {\n        return height - adjust + Math.min(adjust, Math.max(0, y - offset))\n      })\n    )\n\n  /* Compute whether the sidebar should be locked */\n  const lock$ = combineLatest([offset$, main$])\n    .pipe(\n      map(([{ y }, { offset }]) => y >= offset + adjust)\n    )\n\n  /* Combine into single hot observable */\n  return combineLatest([height$, lock$])\n    .pipe(\n      map(([height, lock]) => ({ height, lock })),\n      distinctUntilChanged<Sidebar>(equals),\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint sidebar from source observable\n *\n * @param el - Sidebar element\n *\n * @return Operator function\n */\nexport function paintSidebar(\n  el: HTMLElement\n): MonoTypeOperatorFunction<Sidebar> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ height, lock }) => {\n      setSidebarHeight(el, height)\n      setSidebarLock(el, lock)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetSidebarHeight(el)\n      resetSidebarLock(el)\n    })\n  )\n}\n","/**\n * Tests whether or not an object is an array.\n *\n * @private\n * @param {*} val The object to test.\n * @return {Boolean} `true` if `val` is an array, `false` otherwise.\n * @example\n *\n *      _isArray([]); //=> true\n *      _isArray(null); //=> false\n *      _isArray({}); //=> false\n */\nexport default Array.isArray || function _isArray(val) {\n  return val != null && val.length >= 0 && Object.prototype.toString.call(val) === '[object Array]';\n};","export default function _isTransformer(obj) {\n  return obj != null && typeof obj['@@transducer/step'] === 'function';\n}","import _isArray from './_isArray.js';\nimport _isTransformer from './_isTransformer.js';\n\n/**\n * Returns a function that dispatches with different strategies based on the\n * object in list position (last argument). If it is an array, executes [fn].\n * Otherwise, if it has a function with one of the given method names, it will\n * execute that function (functor case). Otherwise, if it is a transformer,\n * uses transducer [xf] to return a new transformer (transducer case).\n * Otherwise, it will default to executing [fn].\n *\n * @private\n * @param {Array} methodNames properties to check for a custom implementation\n * @param {Function} xf transducer to initialize if object is transformer\n * @param {Function} fn default ramda implementation\n * @return {Function} A function that dispatches on object in list position\n */\nexport default function _dispatchable(methodNames, xf, fn) {\n  return function () {\n    if (arguments.length === 0) {\n      return fn();\n    }\n    var args = Array.prototype.slice.call(arguments, 0);\n    var obj = args.pop();\n    if (!_isArray(obj)) {\n      var idx = 0;\n      while (idx < methodNames.length) {\n        if (typeof obj[methodNames[idx]] === 'function') {\n          return obj[methodNames[idx]].apply(obj, args);\n        }\n        idx += 1;\n      }\n      if (_isTransformer(obj)) {\n        var transducer = xf.apply(null, args);\n        return transducer(obj);\n      }\n    }\n    return fn.apply(this, arguments);\n  };\n}","export default {\n  init: function () {\n    return this.xf['@@transducer/init']();\n  },\n  result: function (result) {\n    return this.xf['@@transducer/result'](result);\n  }\n};","import _curry2 from './_curry2.js';\nimport _xfBase from './_xfBase.js';\n\nvar XFindLast = /*#__PURE__*/function () {\n  function XFindLast(f, xf) {\n    this.xf = xf;\n    this.f = f;\n  }\n  XFindLast.prototype['@@transducer/init'] = _xfBase.init;\n  XFindLast.prototype['@@transducer/result'] = function (result) {\n    return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.last));\n  };\n  XFindLast.prototype['@@transducer/step'] = function (result, input) {\n    if (this.f(input)) {\n      this.last = input;\n    }\n    return result;\n  };\n\n  return XFindLast;\n}();\n\nvar _xfindLast = /*#__PURE__*/_curry2(function _xfindLast(f, xf) {\n  return new XFindLast(f, xf);\n});\nexport default _xfindLast;","import _curry2 from './internal/_curry2.js';\nimport _dispatchable from './internal/_dispatchable.js';\nimport _xfindLast from './internal/_xfindLast.js';\n\n/**\n * Returns the last element of the list which matches the predicate, or\n * `undefined` if no element matches.\n *\n * Acts as a transducer if a transformer is given in list position.\n *\n * @func\n * @memberOf R\n * @since v0.1.1\n * @category List\n * @sig (a -> Boolean) -> [a] -> a | undefined\n * @param {Function} fn The predicate function used to determine if the element is the\n * desired one.\n * @param {Array} list The array to consider.\n * @return {Object} The element found, or `undefined`.\n * @see R.transduce\n * @example\n *\n *      const xs = [{a: 1, b: 0}, {a:1, b: 1}];\n *      R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}\n *      R.findLast(R.propEq('a', 4))(xs); //=> undefined\n */\nvar findLast = /*#__PURE__*/_curry2( /*#__PURE__*/_dispatchable([], _xfindLast, function findLast(fn, list) {\n  var idx = list.length - 1;\n  while (idx >= 0) {\n    if (fn(list[idx])) {\n      return list[idx];\n    }\n    idx -= 1;\n  }\n}));\nexport default findLast;","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest, fromEvent } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  map,\n  shareReplay,\n  startWith\n} from \"rxjs/operators\"\n\nimport { watchElementFocus } from \"../../agent\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search query\n */\nexport interface SearchQuery {\n  value: string                        /* Query value */\n  focus: boolean                       /* Query focus */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  prepare(value: string): string       /* Preparation function */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch search query\n *\n * @param el - Search query element\n * @param options - Options\n *\n * @return Search query observable\n */\nexport function watchSearchQuery(\n  el: HTMLInputElement, { prepare }: Options\n): Observable<SearchQuery> {\n\n  /* Intercept keyboard events */\n  const value$ = fromEvent(el, \"keyup\")\n    .pipe(\n      map(() => prepare(el.value)),\n      startWith(\"\"),\n      distinctUntilChanged()\n    )\n\n  /* Intercept focus events */\n  const focus$ = watchElementFocus(el)\n\n  /* Combine into a single hot observable */\n  return combineLatest([value$, focus$])\n    .pipe(\n      map(([value, focus]) => ({ value, focus })),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent, merge } from \"rxjs\"\nimport { mapTo, shareReplay, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch element focus\n *\n * @param el - Element\n *\n * @return Element focus observable\n */\nexport function watchElementFocus(\n  el: HTMLElement\n): Observable<boolean> {\n  const focus$ = fromEvent(el, \"focus\")\n  const blur$  = fromEvent(el, \"blur\")\n\n  /* Map events to boolean state */\n  return merge(\n    focus$.pipe(mapTo(true)),\n    blur$.pipe(mapTo(false))\n  )\n    .pipe(\n      startWith(el === document.activeElement),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { mapTo } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch search reset\n *\n * @param el - Search reset element\n *\n * @return Search reset observable\n */\nexport function watchSearchReset(\n  el: HTMLElement\n): Observable<void> {\n  return fromEvent(el, \"click\")\n    .pipe(\n      mapTo(undefined)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchResult } from \"modules\"\nimport { h, truncate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  item:    \"md-search-result__item\",\n  link:    \"md-search-result__link\",\n  article: \"md-search-result__article md-search-result__article--document\",\n  section: \"md-search-result__article\",\n  title:   \"md-search-result__title\",\n  teaser:  \"md-search-result__teaser\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render a search result\n *\n * @param result - Search result\n *\n * @return HTML element\n */\nexport function renderSearchResult(\n  { article, sections }: SearchResult\n): HTMLElement {\n  const children = [article, ...sections].map(document => {\n    const { location, title, text } = document\n    return (\n      <a href={location} class={css.link} tabIndex={-1}>\n        <article class={\"parent\" in document ? css.section : css.article}>\n          <h1 class={css.title}>{title}</h1>\n          {text.length\n            ? <p class={css.teaser}>{truncate(text, 320)}</p>\n            : undefined\n          }\n        </article>\n      </a>\n    )\n  })\n  return (\n    <li class={css.item}>\n      {...children}\n    </li>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  facts: \"md-source__facts\",\n  fact:  \"md-source__fact\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render source facts\n *\n * @param facts - Source facts\n *\n * @return HTML element\n */\nexport function renderSource(\n  facts: any // TODO: add typings\n): HTMLElement {\n  return (\n    <ul class={css.facts}>\n      {facts.map((fact: any) => <li class={css.fact}>{fact}</li>)}\n    </ul>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  pipe\n} from \"rxjs\"\nimport {\n  finalize,\n  map,\n  mapTo,\n  observeOn,\n  scan,\n  switchMap,\n  withLatestFrom\n} from \"rxjs/operators\"\n\nimport {\n  addToSearchResultList,\n  resetSearchResultList,\n  resetSearchResultMeta,\n  setSearchResultMeta\n} from \"actions\"\nimport { SearchResult } from \"modules\"\nimport { renderSearchResult } from \"templates\"\n\nimport { getElement } from \"../../agent\"\nimport { SearchQuery } from \"../query\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  query$: Observable<SearchQuery>     /* Search query observable */\n  fetch$: Observable<boolean>         /* Search trigger observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint search results from source observable\n *\n * @param el - Search result element\n * @param options - Options\n *\n * @return Operator function\n */\nexport function paintSearchResult(\n  el: HTMLElement, { query$, fetch$ }: Options\n): MonoTypeOperatorFunction<SearchResult[]> {\n  const list = getElement(\".md-search-result__list\", el)!\n  const meta = getElement(\".md-search-result__meta\", el)!\n  return pipe(\n\n    /* Paint search result metadata */\n    withLatestFrom(query$),\n    map(([result, query]) => {\n      if (query.value) {\n        setSearchResultMeta(meta, result.length)\n      } else {\n        resetSearchResultMeta(meta)\n      }\n      return result\n    }),\n\n    /* Paint search result list */\n    switchMap(result => fetch$\n      .pipe(\n\n        /* Defer repaint to next animation frame */\n        observeOn(animationFrameScheduler),\n        scan(index => {\n          const container = el.parentElement!\n          while (index < result.length) {\n            addToSearchResultList(list, renderSearchResult(result[index++]))\n            if (container.scrollHeight - container.offsetHeight > 16)\n              break\n          }\n          return index\n        }, 0),\n\n        /* Re-map to search result */\n        mapTo(result),\n\n        /* Reset on complete or error */\n        finalize(() => {\n          resetSearchResultList(list)\n        })\n      )\n    )\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, fromEvent } from \"rxjs\"\nimport { map, startWith } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set toggle\n *\n * Simulating a click event seems to be the most cross-browser compatible way\n * of changing the value while also emitting a `change` event. Before, Material\n * used `CustomEvent` to programmatically change the value of a toggle, but this\n * is a much simpler and cleaner solution.\n *\n * @param el - Toggle element\n * @param value - Toggle value\n */\nexport function setToggle(\n  el: HTMLInputElement, value: boolean\n): void {\n  if (el.checked !== value)\n    el.click()\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Watch toggle\n *\n * @param el - Toggle element\n *\n * @return Toggle observable\n */\nexport function watchToggle(\n  el: HTMLInputElement\n): Observable<boolean> {\n  return fromEvent(el, \"change\")\n    .pipe(\n      map(() => el.checked),\n      startWith(el.checked)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  map,\n  shareReplay,\n  switchMapTo\n} from \"rxjs/operators\"\n\nimport { ViewportOffset, ViewportSize } from \"observables\"\n\nimport { HeaderState } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<HeaderState>     /* Header state observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch viewport offset relative to an element's top\n *\n * This function returns an observable that computes the relative offset to the\n * top of the given element based on the current viewport offset.\n *\n * @param el - HTML element\n * @param options - Options\n *\n * @return Viewport offset observable\n */\nexport function watchViewportOffsetFromTopOf(\n  el: HTMLElement, { header$, offset$, size$ }: Options\n): Observable<ViewportOffset> {\n\n  /* Compute necessary adjustment for offset */\n  const adjust$ = size$\n    .pipe(\n      switchMapTo(header$),\n      map(({ height }) => el.offsetTop - height),\n      distinctUntilChanged()\n    )\n\n  /* Compute relative offset and return as hot observable */\n  return combineLatest([offset$, adjust$])\n    .pipe(\n      map(([{ x, y }, adjust]) => ({ x, y: y - adjust })),\n      shareReplay(1)\n    )\n}\n\n/**\n * Watch viewport offset relative to an element's bottom\n *\n * This function returns an observable that computes the relative offset to the\n * bottom of the given element based on the current viewport offset.\n *\n * @param el - HTML element\n * @param options - Options\n *\n * @return Viewport offset observable\n */\nexport function watchViewportOffsetFromBottomOf(\n  el: HTMLElement, { header$, offset$, size$ }: Options\n): Observable<ViewportOffset> {\n\n  /* Compute necessary adjustment for offset */\n  const adjust$ = size$\n    .pipe(\n      switchMapTo(header$),\n      map(({ height }) => el.offsetTop + el.offsetHeight - height),\n      distinctUntilChanged()\n    )\n\n  /* Compute relative offset and return as hot observable */\n  return combineLatest([offset$, adjust$])\n    .pipe(\n      map(([{ x, y }, adjust]) => ({ x, y: y - adjust })),\n      shareReplay(1)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { OperatorFunction, animationFrameScheduler, pipe } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  observeOn,\n  tap\n} from \"rxjs/operators\"\n\nimport { resetHidden, setHidden } from \"actions\"\nimport { ViewportOffset } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint hideable from source observable\n *\n * @param el - Hideable element\n * @param offset - Additional offset\n *\n * @return Operator function\n */\nexport function paintHideable(\n  el: HTMLElement, offset: number = 0\n): OperatorFunction<ViewportOffset, boolean> {\n  return pipe(\n    map(({ y }) => y >= offset),\n    distinctUntilChanged(),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(value => {\n      setHidden(el, value)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetHidden(el)\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport { switchMapIf } from \"utilities\"\n\nimport { ViewportOffset, ViewportSize } from \"observables\"\nimport { HeaderState, watchViewportOffsetFromTopOf } from \"../header\"\nimport { paintHideable } from \"../main\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Hero state\n */\nexport interface HeroState {\n  hidden: boolean                      /* Whether the hero is hidden */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<HeaderState>     /* Header observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n  screen$: Observable<boolean>         /* Media screen observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch hero\n *\n * @param el - Hero element\n * @param agent - Agent\n * @param options - Options\n *\n * @return Hero state\n */\nexport function watchHero(\n  el: HTMLElement, options: Options\n): Observable<HeroState> {\n\n  /* Watch and paint visibility */\n  const hidden$ = watchViewportOffsetFromTopOf(el, options)\n    .pipe(\n      paintHideable(el, 20)\n    )\n\n  /* Combine into a single hot observable */\n  return hidden$\n    .pipe(\n      map(hidden => ({ hidden }))\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount hero from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountHero(\n  options: Options\n): OperatorFunction<HTMLElement, HeroState> {\n  return pipe(\n    switchMapIf(options.screen$, el => watchHero(el, options)),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport { ViewportOffset, ViewportSize } from \"observables\"\nimport { switchMapIf } from \"utilities\"\n\nimport { HeaderState, watchViewportOffsetFromTopOf } from \"../header\"\nimport { paintHideable } from \"../main\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Tabs state\n */\nexport interface TabsState {\n  hidden: boolean                      /* Whether the tabs are hidden */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<HeaderState>     /* Header state observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n  screen$: Observable<boolean>         /* Media screen observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch tabs\n *\n * This function returns an observable that computes the visual parameters of\n * the tabs, currently only denoting whether the tabs are hidden or not.\n *\n * @param el - Tabs element\n * @param options - Options\n *\n * @return Tabs state\n */\nexport function watchTabs(\n  el: HTMLElement, options: Options\n): Observable<TabsState> {\n\n  /* Watch and paint visibility */\n  const hidden$ = watchViewportOffsetFromTopOf(el, options)\n    .pipe(\n      paintHideable(el, 8)\n    )\n\n  /* Combine into a single hot observable */\n  return hidden$\n    .pipe(\n      map(hidden => ({ hidden }))\n    )\n}\n// TODO: generalize into watchHideable !!! or mountHideable...\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount tabs from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountTabs(\n  options: Options\n): OperatorFunction<HTMLElement, TabsState> {\n  return pipe(\n    switchMapIf(options.screen$, el => watchTabs(el, options)),\n    shareReplay(1)\n  )\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Packer message type\n */\nexport const enum PackerMessageType {\n  STRING,                              /* String data */\n  BINARY                               /* Packed data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing an unpacked string\n */\nexport interface PackerStringMessage {\n  type: PackerMessageType.STRING       /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing a packed string\n */\nexport interface PackerBinaryMessage {\n  type: PackerMessageType.BINARY       /* Message type */\n  data: string                         /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the packer worker\n */\nexport type PackerMessage =\n  | PackerStringMessage\n  | PackerBinaryMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for packer binary messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerBinaryMessage(\n  message: PackerMessage\n): message is PackerBinaryMessage {\n  return message.type === PackerMessageType.BINARY\n}\n\n/**\n * Type guard for packer string messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerStringMessage(\n  message: PackerMessage\n): message is PackerStringMessage {\n  return message.type === PackerMessageType.STRING\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndexOptions, SearchResult } from \"modules\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search message type\n */\nexport const enum SearchMessageType {\n  SETUP,                               /* Search index setup */\n  DUMP,                                /* Search index dump */\n  QUERY,                               /* Search query */\n  RESULT                               /* Search results */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing the data necessary to setup the search index\n */\nexport interface SearchSetupMessage {\n  type: SearchMessageType.SETUP        /* Message type */\n  data: SearchIndexOptions             /* Message data */\n}\n\n/**\n * A message containing the a dump of the search index\n */\nexport interface SearchDumpMessage {\n  type: SearchMessageType.DUMP        /* Message type */\n  data: string                        /* Message data */\n}\n\n/**\n * A message containing a search query\n */\nexport interface SearchQueryMessage {\n  type: SearchMessageType.QUERY        /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing results for a search query\n */\nexport interface SearchResultMessage {\n  type: SearchMessageType.RESULT       /* Message type */\n  data: SearchResult[]                 /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the search worker\n */\nexport type SearchMessage =\n  | SearchSetupMessage\n  | SearchDumpMessage\n  | SearchQueryMessage\n  | SearchResultMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for search setup messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchSetupMessage(\n  message: SearchMessage\n): message is SearchSetupMessage {\n  return message.type === SearchMessageType.SETUP\n}\n\n/**\n * Type guard for search dump messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchDumpMessage(\n  message: SearchMessage\n): message is SearchDumpMessage {\n  return message.type === SearchMessageType.DUMP\n}\n\n/**\n * Type guard for search query messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchQueryMessage(\n  message: SearchMessage\n): message is SearchQueryMessage {\n  return message.type === SearchMessageType.QUERY\n}\n\n/**\n * Type guard for search result messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchResultMessage(\n  message: SearchMessage\n): message is SearchResultMessage {\n  return message.type === SearchMessageType.RESULT\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, combineLatest, pipe } from \"rxjs\"\nimport { map, shareReplay } from \"rxjs/operators\"\n\nimport {\n  AnchorList,\n  Header,\n  Main,\n  Sidebar,\n  ViewportOffset,\n  ViewportSize,\n  getElements,\n  paintAnchorList,\n  paintSidebar,\n  watchAnchorList,\n  watchSidebar\n} from \"observables\"\nimport { switchMapIf } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Table of contents state\n */\nexport interface TableOfContentsState {\n  sidebar: Sidebar                     /* Sidebar state */\n  anchors: AnchorList                  /* Anchor list */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  main$: Observable<Main>              /* Main area observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n  tablet$: Observable<boolean>         /* Media tablet observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch table of contents\n *\n * @param el - Table of contents element\n * @param agent - Agent\n * @param options - Options\n *\n * @return Table of contents state observable\n */\nexport function watchTableOfContents(\n  el: HTMLElement, { header$, main$, offset$, size$ }: Options\n): Observable<TableOfContentsState> {\n\n  /* Watch and paint sidebar */\n  const sidebar$ = watchSidebar(el, { main$, offset$ })\n    .pipe(\n      paintSidebar(el)\n    )\n\n  /* Watch and paint anchor list (scroll spy) */\n  const els = getElements<HTMLAnchorElement>(\".md-nav__link\", el)\n  const anchors$ = watchAnchorList(els, { header$, offset$, size$ })\n    .pipe(\n      paintAnchorList(els)\n    )\n\n  /* Combine into a single hot observable */\n  return combineLatest([sidebar$, anchors$])\n    .pipe(\n      map(([sidebar, anchors]) => ({ sidebar, anchors }))\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Mount table of contents from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountTableOfContents(\n  options: Options\n): OperatorFunction<HTMLElement, TableOfContentsState> {\n  return pipe(\n    switchMapIf(options.tablet$, el => watchTableOfContents(el, options)),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { difference, reverse } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  combineLatest,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  finalize,\n  map,\n  observeOn,\n  scan,\n  shareReplay,\n  switchMap,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetAnchorActive,\n  resetAnchorBlur,\n  setAnchorActive,\n  setAnchorBlur\n} from \"actions\"\n\nimport {\n  ViewportOffset,\n  ViewportSize,\n  getElement\n} from \"../agent\"\nimport { Header } from \"../header\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Anchor list\n */\nexport interface AnchorList {\n  prev: HTMLAnchorElement[][]          /* Anchors (previous) */\n  next: HTMLAnchorElement[][]          /* Anchors (next) */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch anchor list\n *\n * This is effectively a scroll-spy implementation which will account for the\n * fixed header and automatically re-calculate anchor offsets when the viewport\n * is resized. The returned observable will only emit if the anchor list needs\n * to be repainted.\n *\n * This implementation tracks an anchor element's entire path starting from its\n * level up to the top-most anchor element, e.g. `[h3, h2, h1]`. Although the\n * Material theme currently doesn't make use of this information, it enables\n * the styling of the entire hierarchy through customization.\n *\n * Note that the current anchor is the last item of the `prev` anchor list.\n *\n * @param els - Anchor elements\n * @param options - Options\n *\n * @return Anchor list observable\n */\nexport function watchAnchorList(\n  els: HTMLAnchorElement[], { header$, offset$, size$ }: Options\n): Observable<AnchorList> {\n  const table = new Map<HTMLAnchorElement, HTMLElement>()\n  for (const el of els) {\n    const id = decodeURIComponent(el.hash.substring(1))\n    const target = getElement(`[id=\"${id}\"]`)\n    if (typeof target !== \"undefined\")\n      table.set(el, target)\n  }\n\n  /* Compute necessary adjustment for header */\n  const adjust$ = header$\n    .pipe(\n      map(header => 18 + header.height)\n    )\n\n  /* Compute partition of previous and next anchors */\n  const partition$ = size$\n    .pipe(\n\n      /* Build index to map anchor paths to vertical offsets */\n      map(() => {\n        let path: HTMLAnchorElement[] = []\n        return [...table].reduce((index, [anchor, target]) => {\n          while (path.length) {\n            const last = table.get(path[path.length - 1])!\n            if (last.tagName >= target.tagName) {\n              path.pop()\n            } else {\n              break\n            }\n          }\n          return index.set(\n            reverse(path = [...path, anchor]),\n            target.offsetTop\n          )\n        }, new Map<HTMLAnchorElement[], number>())\n      }),\n\n      /* Re-compute partition when viewport offset changes */\n      switchMap(index => combineLatest(offset$, adjust$)\n        .pipe(\n          scan(([prev, next], [{ y }, adjust]) => {\n\n            /* Look forward */\n            while (next.length) {\n              const [, offset] = next[0]\n              if (offset - adjust < y) {\n                prev = [...prev, next.shift()!]\n              } else {\n                break\n              }\n            }\n\n            /* Look backward */\n            while (prev.length) {\n              const [, offset] = prev[prev.length - 1]\n              if (offset - adjust >= y) {\n                next = [prev.pop()!, ...next]\n              } else {\n                break\n              }\n            }\n\n            /* Return partition */\n            return [prev, next]\n          }, [[], [...index]]),\n          distinctUntilChanged((a, b) => {\n            return a[0] === b[0]\n                && a[1] === b[1]\n          })\n        )\n      )\n    )\n\n  /* Compute anchor list migrations */\n  const migration$ = partition$\n    .pipe(\n      map(([prev, next]) => ({\n        prev: prev.map(([path]) => path),\n        next: next.map(([path]) => path)\n      })),\n\n      /* Extract anchor list migrations */\n      scan<AnchorList>((a, b) => {\n        const begin = Math.max(0, Math.min(b.prev.length, a.prev.length) - 1)\n        const end   = Math.max(b.prev.length, a.prev.length)\n        return {\n          prev: b.prev.slice(begin, end + 1),\n          next: difference(b.next, a.next)\n        }\n      }, { prev: [], next: [] })\n    )\n\n  /* Return anchor list migrations as hot observable */\n  return migration$\n    .pipe(\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint anchor list from source observable\n *\n * @param els - Anchor elements\n *\n * @return Operator function\n */\nexport function paintAnchorList(\n  els: HTMLAnchorElement[]\n): MonoTypeOperatorFunction<AnchorList> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ prev, next }) => {\n\n      /* Look forward */\n      for (const [el] of next) {\n        resetAnchorActive(el)\n        resetAnchorBlur(el)\n      }\n\n      /* Look backward */\n      for (const [index, [el]] of prev.entries()) {\n        setAnchorActive(el, index === prev.length - 1)\n        setAnchorBlur(el, true)\n      }\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      for (const el of els) {\n        resetAnchorActive(el)\n        resetAnchorBlur(el)\n      }\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h, translate } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  container: \"md-clipboard md-icon\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render clipboard\n *\n * @param id - Unique identifier\n *\n * @return HTML element\n */\nexport function renderClipboard(\n  id: string\n): HTMLElement {\n  return (\n    <button\n      class={css.container}\n      title={translate(\"clipboard.copy\")}\n      data-clipboard-target={`#${id} code`}\n    >&#xE14D;</button>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Repo, User } from \"github-types\"\nimport { NEVER, Observable } from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport { filter, map, pluck, shareReplay } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Round a number\n *\n * TODO: document\n */\nfunction round(value: number) {\n  return value > 999\n    ? `${(value / 1000).toFixed(1)}k`\n    : `${(value)}`\n}\n\n/**\n * TODO: document\n */\nexport function fetchGitHubStats(\n  user: string\n): Observable<User>\nexport function fetchGitHubStats(\n  user: string, repo: string\n): Observable<Repo>\nexport function fetchGitHubStats(\n  user: string, repo?: string\n): Observable<User | Repo> {\n  const endpoint = typeof repo !== \"undefined\"\n    ? `repos/${user}/${repo}`\n    : `users/${user}`\n  return ajax({\n    url: `https://api.github.com/${endpoint}`,\n    responseType: \"json\"\n  })\n    .pipe(\n      filter(({ status }) => status === 200),\n      pluck(\"response\"),\n      shareReplay(1)\n    )\n}\n\n// TODO: GitLab API:\n// https://docs.gitlab.com/ee/api/projects.html#get-single-project\n// curl \"https://gitlab.com/api/v4/projects/johannes-z%2Fmkdocs-material\"\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Get repository information\n *\n * TODO: document\n */\nexport function getRepository(user: string, repo: string): Observable<string[]> {\n  return fetchGitHubStats(user, repo)\n    .pipe(\n      map(({ stargazers_count, forks_count }) => ([\n        `${round(stargazers_count || 0)} Stars`,\n        `${round(forks_count || 0)} Forks`\n      ]))\n    )\n}\n\n/**\n * Get user/organization information\n *\n * TODO: document\n */\nexport function getUser(user: string): Observable<string[]> {\n  return fetchGitHubStats(user)\n    .pipe(\n      map(({ public_repos }) => ([\n        `${round(public_repos || 0)} Repositories`\n      ]))\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, OperatorFunction, of, pipe } from \"rxjs\"\nimport { map, shareReplay, switchMap } from \"rxjs/operators\"\n\nimport {\n  Main,\n  NavigationLayer,\n  Sidebar,\n  ViewportOffset,\n  getElements,\n  paintNavigationLayer,\n  paintSidebar,\n  watchNavigationLayer,\n  watchSidebar\n} from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Navigation for breakpoint below screen\n */\nexport interface NavigationBelowScreen {\n  layer: NavigationLayer               /* Navigation layer */\n}\n\n/**\n * Navigation for breakpoint above screen\n */\nexport interface NavigationAboveScreen {\n  sidebar: Sidebar                     /* Navigation sidebar */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Navigation\n */\nexport type Navigation =\n  | NavigationBelowScreen\n  | NavigationAboveScreen\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  main$: Observable<Main>              /* Main area observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  screen$: Observable<boolean>         /* Screen media observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount navigation below screen from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nfunction mountNavigationBelowScreen(\n  _options: Options\n): OperatorFunction<HTMLElement, NavigationBelowScreen> {\n  return pipe(\n    map(el => getElements(\"nav\", el)),\n    switchMap(els => watchNavigationLayer(els)\n      .pipe(\n        paintNavigationLayer(els),\n        map(layer => ({ layer }))\n      )\n    )\n  )\n}\n\n/**\n * Mount navigation above screen from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nfunction mountNavigationAboveScreen(\n  options: Options\n): OperatorFunction<HTMLElement, NavigationAboveScreen> {\n  return pipe(\n    switchMap(el => watchSidebar(el, options)\n      .pipe(\n        paintSidebar(el),\n        map(sidebar => ({ sidebar }))\n      )\n    )\n  )\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount navigation from source observable\n *\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountNavigation(\n  options: Options\n): OperatorFunction<HTMLElement, Navigation> {\n  return pipe(\n    switchMap(el => options.screen$\n      .pipe(\n        switchMap(screen => screen\n          ? of(el).pipe(mountNavigationAboveScreen(options))\n          : of(el).pipe(mountNavigationBelowScreen(options))\n        )\n      )\n    ),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { findLast } from \"ramda\"\nimport {\n  MonoTypeOperatorFunction,\n  Observable,\n  animationFrameScheduler,\n  fromEvent,\n  merge,\n  pipe\n} from \"rxjs\"\nimport {\n  delay,\n  finalize,\n  map,\n  observeOn,\n  scan,\n  shareReplay,\n  tap\n} from \"rxjs/operators\"\n\nimport {\n  resetOverflowScrolling,\n  setOverflowScrolling\n} from \"actions\"\n\nimport { getElement } from \"../../agent\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Navigation layer\n */\nexport interface NavigationLayer {\n  prev?: HTMLElement                   /* Layer (previous) */\n  next: HTMLElement                    /* Layer (next) */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch navigation layer\n *\n * On iOS we want to add `-webkit-overflow-scrolling: touch` for the menus\n * contained in the drawer, but as the navigational layers are nested, we can\n * only add it to the navigation layer or extremely weird cropping will occur.\n * This implementation keeps track of the previous and current layer.\n *\n * @param els - Navigation elements\n *\n * @return Navigation layer observable\n */\nexport function watchNavigationLayer(\n  els: HTMLElement[]\n): Observable<NavigationLayer> {\n  const table = new Map<HTMLInputElement, HTMLElement>()\n  for (const el of els) {\n    const label = getElement<HTMLLabelElement>(\"label\", el)\n    if (typeof label !== \"undefined\") {\n      const input = getElement<HTMLInputElement>(`#${label.htmlFor}`)!\n      table.set(input, el)\n    }\n  }\n\n  /* Determine active layer */\n  const layer$ = merge(\n    ...[...table.keys()].map(input => fromEvent(input, \"change\"))\n  )\n    .pipe(\n      map(() => getElement(\".md-nav__list\", table.get(\n        findLast(({ checked }) => checked, [...table.keys()])!\n      ))!)\n    )\n\n  /* Return previous and next layer */\n  return layer$\n    .pipe(\n      map(next => ({ next })),\n      scan(({ next: prev }, { next }) => ({ prev, next })),\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Paint navigation layer from source observable\n *\n * @param els - Navigation elements\n *\n * @return Operator function\n */\nexport function paintNavigationLayer(\n  els: HTMLElement[]\n): MonoTypeOperatorFunction<NavigationLayer> {\n  return pipe(\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ prev }) => {\n      if (prev)\n        resetOverflowScrolling(prev)\n    }),\n\n    /* Wait until transition has finished */\n    delay(250),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ next }) => {\n      setOverflowScrolling(next)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      for (const el of els)\n        resetOverflowScrolling(\n          getElement(\".md-nav__list\", el)!\n        )\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { identity } from \"ramda\"\nimport { Observable, OperatorFunction, pipe } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  filter,\n  map,\n  shareReplay,\n  switchMap\n} from \"rxjs/operators\"\n\nimport { SearchResult } from \"modules\"\nimport {\n  SearchQuery,\n  ViewportSize,\n  paintSearchResult,\n  watchElementOffset\n} from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  query$: Observable<SearchQuery>      /* Search query observable */\n  result$: Observable<SearchResult[]>  /* Search result observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Mount search result from source observable\n *\n * @param agent - Agent\n * @param options - Options\n *\n * @return Operator function\n */\nexport function mountSearchResult(\n  { query$, result$, size$ }: Options\n): OperatorFunction<HTMLElement, SearchResult[]> {\n  return pipe(\n    switchMap(el => {\n      const container = el.parentElement!\n\n      /* Compute whether there are more search results to fetch */\n      const fetch$ = watchElementOffset(container, { size$ })\n        .pipe(\n          map(({ y }) => {\n            return y >= container.scrollHeight - container.offsetHeight - 16\n          }),\n          distinctUntilChanged(),\n          filter(identity)\n        )\n\n      /* Paint search results */\n      return result$\n        .pipe(\n          paintSearchResult(el, { query$, fetch$ })\n        )\n    }),\n    shareReplay(1)\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { h } from \"utilities\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * CSS classes\n */\nconst css = {\n  wrapper: \"md-typeset__scrollwrap\",\n  table:   \"md-typeset__table\"\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Render a table wrapper\n *\n * @param table - Table element\n *\n * @return HTML element\n */\nexport function renderTable(\n  table: HTMLTableElement\n): HTMLElement {\n  return (\n    <div class={css.wrapper}>\n      <div class={css.table}>\n        {table}\n      </div>\n    </div>\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n// TODO: remove this after we finished refactoring\n// tslint:disable\n\nimport \"../stylesheets/app.scss\"\nimport \"../stylesheets/app-palette.scss\"\n\nimport * as Clipboard from \"clipboard\"\nimport { identity, values } from \"ramda\"\nimport {\n  EMPTY,\n  Observable,\n  Subject,\n  forkJoin,\n  merge,\n  of,\n  fromEvent,\n  interval,\n  NEVER,\n  combineLatest\n} from \"rxjs\"\nimport { ajax } from \"rxjs/ajax\"\nimport {\n  delay,\n  filter,\n  map,\n  pluck,\n  switchMap,\n  switchMapTo,\n  take,\n  tap,\n  withLatestFrom,\n  distinctUntilChanged,\n  distinctUntilKeyChanged,\n  bufferCount,\n  shareReplay,\n} from \"rxjs/operators\"\n\nimport {\n  Component,\n  paintHeaderShadow,\n  mountHero,\n  mountMain,\n  mountTableOfContents,\n  mountTabs,\n  switchComponent,\n  watchComponentMap,\n} from \"./components\"\nimport {\n  watchHeader,\n  watchSearchQuery,\n  watchSearchReset,\n  getElement,\n  watchToggle,\n  watchWorker,\n  setToggle,\n  getElements,\n  watchMedia,\n  watchDocument,\n  watchLocation,\n  watchLocationHash,\n  watchViewportOffset,\n  watchViewportSize,\n  watchMain\n} from \"./observables\"\nimport { SearchIndexOptions } from \"./modules\"\nimport {\n  PackerMessage,\n  PackerMessageType,\n  SearchMessage,\n  SearchMessageType,\n  SearchSetupMessage,\n  isSearchDumpMessage,\n  isSearchResultMessage\n} from \"./workers\"\nimport { renderSource } from \"templates\"\nimport { not, takeIf } from \"utilities\"\nimport { renderClipboard } from \"templates/clipboard\"\nimport { fetchGitHubStats } from \"modules/source/github\"\nimport { mountNavigation } from \"components2/navigation\"\nimport { mountSearchResult } from \"components2/search\"\nimport { renderTable } from \"templates/table\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Configuration\n */\nexport interface Config {\n  base: string                         /* Base URL */\n  worker: {\n    search: string                     /* Search worker URL */\n    packer: string                     /* Packer worker URL */\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * TODO: where do we put this stuff?\n * ------------------------------------------------------------------------- */\n\ndocument.documentElement.classList.remove(\"no-js\")\ndocument.documentElement.classList.add(\"js\")\n\nconst names: Component[] = [\n  \"container\",                       /* Container */\n  \"header\",                          /* Header */\n  \"header-title\",                    /* Header title */\n  \"hero\",                            /* Hero */\n  \"main\",                            /* Main area */\n  \"navigation\",                      /* Navigation */\n  \"search\",                          /* Search */\n  \"search-query\",                    /* Search input */\n  \"search-reset\",                    /* Search reset */\n  \"search-result\",                   /* Search results */\n  \"tabs\",                            /* Tabs */\n  \"toc\"                              /* Table of contents */\n]\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Ensure that the given value is a valid configuration\n *\n * We could use `jsonschema` or any other schema validation framework, but that\n * would just add more bloat to the bundle, so we'll keep it plain and simple.\n *\n * @param config - Configuration\n *\n * @return Test result\n */\nfunction isConfig(config: any): config is Config {\n  return typeof config === \"object\"\n      && typeof config.base === \"string\"\n      && typeof config.worker === \"object\"\n      && typeof config.worker.search === \"string\"\n      && typeof config.worker.packer === \"string\"\n}\n\n/**\n  *\n  * Rogue control characters must be filtered before handing the query to the\n  * search index, as lunr will throw otherwise.\n */\nfunction prepare(value: string): string {\n  const newvalue = value\n    .replace(/(?:^|\\s+)[*+-:^~]+(?=\\s+|$)/g, \"\")\n    .trim()\n\n  return newvalue ? newvalue.replace(/\\s+|$/g, \"* \") : \"\"\n}\n\nfunction setupWorkers(config: Config) {\n  // Remove trailing URL, or search might not work on the 404 page.\n  config.base = config.base.replace(/\\/$/, \"\")\n\n  const worker = new Worker(config.worker.search)\n  const packer = new Worker(config.worker.packer)\n\n  const packerMessage$ = new Subject<PackerMessage>()\n  const packer$ = watchWorker(packer, { message$: packerMessage$ })\n\n  // send a message, then switchMapTo worker!\n\n  packer$.subscribe(message => {\n    // console.log(\"PACKER.MSG\", message.data.length)\n    // is always packed!\n    if (message.type === PackerMessageType.BINARY && message.data[0] !== \"{\")\n      localStorage.setItem(\"index\", message.data)\n  })\n\n  // storing = experimental feature\n\n  const searchMessage$ = new Subject<SearchMessage>()\n\n  const search$ = watchWorker(worker, { message$: searchMessage$ })\n\n  /* Link search to packer */\n  search$\n    .pipe(\n      filter(isSearchDumpMessage),\n      map(message => ({\n        type: PackerMessageType.STRING,\n        data: message.data\n      })),\n      tap(message => packerMessage$.next(message))  // send message and wait!\n      // switchMapTo(packer$)\n    )\n      .subscribe()\n\n  const data$ = ajax({\n    url: `${config.base}/search/search_index.json`,\n    responseType: \"json\",\n    withCredentials: true\n  })\n    .pipe<SearchIndexOptions>(\n      pluck(\"response\"),\n      // map(res => {\n      //   // search language... default for theme language...\n      //   const override = translate(\"search.tokenizer\")\n      //   // TODO: ???\n      //   if (override.length)\n      //     res.config.separator = override\n\n      //   return res\n      // })\n      // take(1)\n    )\n\n  const fromLocal = localStorage.getItem(\"index\")\n\n  ;\n  (fromLocal ? of({\n    type: PackerMessageType.BINARY,\n    data: localStorage.getItem(\"index\")!\n  }) : EMPTY)\n    .subscribe(x => {\n      // console.log(\"send message to packer\")\n      packerMessage$.next(x)\n    })\n\n  const index$ = fromLocal ? packer$.pipe(pluck(\"data\"), take(1)) : of(undefined) // of(localStorage.getItem(\"index\"))\n\n  // index$.subscribe(xx => console.log(\"INDEX\", xx))\n\n  forkJoin([data$, index$])\n    .pipe<SearchSetupMessage>(\n      map(([data, index]) => ({\n        type: SearchMessageType.SETUP,\n        data: { ...data, index }\n      }))\n    )\n      .subscribe(message => {\n        searchMessage$.next(message) // TODO: this shall not complete\n      })\n\n  return [search$, searchMessage$] as const\n}\n\n/**\n * Yes, this is a super hacky implementation. Needs clean up.\n */\nfunction repository() {\n  const el = getElement<HTMLAnchorElement>(\".md-source[href]\") // TODO: dont use classes\n  console.log(el)\n  if (!el)\n    return EMPTY\n\n  const data = sessionStorage.getItem(\"repository\")\n  if (data) {\n    const x = JSON.parse(data)\n    return of(x)\n  }\n\n  // TODO: do correct rounding, see GitHub\n  function format(value: number) {\n    return value > 999\n      ? `${(value / 1000).toFixed(1)}k`\n      : `${(value)}`\n  }\n\n  // github repository...\n  const [, user, repo] = el.href.match(/^.+github\\.com\\/([^\\/]+)\\/?([^\\/]+)?.*$/i)\n\n  // storage memoization!?\n  // get, if not available, exec and persist\n\n  // getOrRetrieve... storage$.\n\n  // Show repo stats\n  if (user && repo) {\n    return fetchGitHubStats(user, repo)\n      .pipe(\n        map(({ stargazers_count, forks_count }) => ([\n          `${format(stargazers_count || 0)} Stars`,\n          `${format(forks_count || 0)} Forks`\n        ])),\n        tap(data => sessionStorage.setItem(\"repository\", JSON.stringify(data)))\n      )\n\n  // Show user or organization stats\n  } else if (user) {\n    return fetchGitHubStats(user)\n      .pipe(\n        map(({ public_repos }) => ([\n          `${format(public_repos || 0)} Repositories`\n        ])),\n        tap(data => sessionStorage.setItem(\"repository\", JSON.stringify(data)))\n      )\n  }\n  return of([])\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Initialize Material for MkDocs\n *\n * @param config - Configuration\n */\nexport function initialize(config: unknown) {\n  if (!isConfig(config))\n    throw new SyntaxError(`Invalid configuration: ${JSON.stringify(config)}`)\n\n  // pass config here!?\n  const agent = {\n    document: {\n      load$:   watchDocument()\n    },\n    location: {\n      href$:   watchLocation(),\n      hash$:   watchLocationHash()\n    },\n    media: {\n      tablet$: watchMedia(\"(min-width: 960px)\"),\n      screen$: watchMedia(\"(min-width: 1220px)\")\n    },\n    viewport: {\n      offset$: watchViewportOffset(),\n      size$:   watchViewportSize()\n    }\n  } // TODO: add a config parameter here to configure media queries\n\n  const offset$ = agent.viewport.offset$\n  const size$   = agent.viewport.size$\n\n  const screen$ = agent.media.screen$\n  const tablet$ = agent.media.tablet$\n\n  const [\n    searchWorkerRecv$,\n    searchMessage$\n  ] = setupWorkers(config)\n\n  // TODO: WIP repo rendering\n  repository().subscribe(facts => {\n    if (facts.length) {\n      const sources = getElements(\".md-source__repository\")\n      sources.forEach(repo => {\n        repo.dataset.mdState = \"done\"\n        repo.appendChild(\n          renderSource(facts)\n        )\n      })\n    }\n  })\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Create component map observable */\n  const components$ = watchComponentMap(names, { document$: agent.document.load$ })\n  const component = <T extends HTMLElement>(name: Component): Observable<T> => {\n    return components$\n      .pipe(\n        switchComponent<T>(name)\n      )\n  }\n\n  /* Create header observable */\n  const header$ = component(\"header\")  // TODO:!\n    .pipe(\n      switchMap(watchHeader)\n    )\n\n  /* Create header shadow toggle */\n  component(\"header\")\n    .pipe(\n      switchMap(el => main$\n        .pipe(\n          paintHeaderShadow(el) // technically, this could be done in paintMain\n        )\n      )\n    )\n      .subscribe()\n\n  // ----------------------------------------------------------------------------\n\n  // watchSearchResult // emit, if at bottom...\n  // receive results as a second observable!? filter stuff, paint\n\n  const result$ = searchWorkerRecv$ // move worker initialization into mountSearch ?\n    .pipe(\n      // tap(m => console.log(\"message from worker\", m)),\n      filter(isSearchResultMessage),\n      pluck(\"data\"),\n      // Prefix URLs with base URL\n      tap(result => result.forEach(item => {\n        item.article.location = `${config.base}/${item.article.location}`\n        item.sections.forEach(section => {\n          section.location = `${config.base}/${section.location}`\n        })\n      }))\n    )\n\n  // handleSearchResult <-- operator\n\n  const query$ = component<HTMLInputElement>(\"search-query\")\n    .pipe(\n      switchMap(el => watchSearchQuery(el, { prepare }))\n    )\n\n  query$\n    .pipe<SearchMessage>(\n      distinctUntilKeyChanged(\"value\"),\n      map(query => ({ // put this into some function...\n        type: SearchMessageType.QUERY,\n        data: query.value\n      })) // TODO. ugly...\n      // distinctUntilKeyChanged(\"data\")\n    )\n      .subscribe(searchMessage$)\n\n  // create the message subject internally... and link it to the worker...?\n  // watchSearchWorker(worker, agent, { query$ }) // message internally...\n\n  query$\n    .pipe(\n      tap(query => {\n        if (query.focus)\n          setToggle(search, true)\n      })\n    )\n      .subscribe()\n\n  /* ----------------------------------------------------------------------- */\n\n  const main$ = component(\"main\")\n    .pipe(\n      switchMap(el => watchMain(el, { header$, offset$, size$})),\n      shareReplay(1)\n    )\n\n  const navigation$ = component(\"navigation\")\n    .pipe(\n      mountNavigation({ main$, offset$, screen$ })\n    )\n\n  const toc$ = component(\"toc\")\n    .pipe(\n      mountTableOfContents({ header$, main$, tablet$, offset$, size$ })\n    )\n\n  // TODO: naming?\n  const resultComponent$ = component(\"search-result\")\n    .pipe(\n      mountSearchResult({ size$, result$, query$: query$.pipe(\n        distinctUntilKeyChanged(\"value\"),\n      ) })\n    ) // temporary fix\n\n  const tabs$ = component(\"tabs\")\n    .pipe(\n      mountTabs({ header$, offset$, size$, screen$ })\n    )\n\n  const hero$ = component(\"hero\")\n    .pipe(\n      mountHero({ header$, offset$, size$, screen$ })\n    )\n\n\n  /* ----------------------------------------------------------------------- */\n\n  const drawer = getElement<HTMLInputElement>(\"[data-md-toggle=drawer]\")!\n  const search = getElement<HTMLInputElement>(\"[data-md-toggle=search]\")!\n\n  const searchActive$ = watchToggle(search)\n    .pipe(\n      delay(400)\n    )\n\n  const reset$ = component(\"search-reset\")\n    .pipe(\n      switchMap(watchSearchReset)\n    )\n\n  const key$ = fromEvent<KeyboardEvent>(window, \"keydown\").pipe(\n    filter(ev => !(ev.metaKey || ev.ctrlKey))\n  )\n\n  // filter arrow keys if search is active!\n  searchActive$.subscribe(console.log)\n\n  // shortcodes\n  key$\n    .pipe(\n      takeIf(not(searchActive$))\n    )\n      .subscribe(ev => {\n        if (\n          document.activeElement && (\n            [\"TEXTAREA\", \"SELECT\", \"INPUT\"].includes(\n              document.activeElement.tagName\n            ) ||\n            document.activeElement instanceof HTMLElement &&\n            document.activeElement.isContentEditable\n          )\n        ) {\n          // do nothing...\n        } else {\n          if (ev.keyCode === 70 || ev.keyCode === 83) {\n            setToggle(search, true)\n          }\n        }\n      })\n  // check which element is focused...\n  // note that all links have tabindex=-1\n  key$\n    .pipe(\n      takeIf(searchActive$),\n\n      /* Abort if meta key (macOS) or ctrl key (Windows) is pressed */\n      tap(ev => {\n        if (ev.key === \"Enter\") {\n          if (document.activeElement === getElement(\"[data-md-component=search-query]\")) {\n            ev.preventDefault()\n            // intercept hash change after search closed\n          } else {\n            setToggle(search, false)\n          }\n        }\n\n        if (ev.key === \"ArrowUp\" || ev.key === \"ArrowDown\") {\n          const active = getElements(\"[data-md-component=search-query], [data-md-component=search-result] [href]\")\n          const i = Math.max(0, active.findIndex(el => el === document.activeElement))\n          const x = Math.max(0, (i + active.length + (ev.keyCode === 38 ? -1 : +1)) % active.length)\n          active[x].focus()\n\n          /* Prevent scrolling of page */\n          ev.preventDefault()\n          ev.stopPropagation()\n\n        } else if (ev.key === \"Escape\" || ev.key === \"Tab\") {\n          setToggle(search, false)\n          getElement(\"[data-md-component=search-query]\")!.blur()\n\n        } else {\n          if (search.checked && document.activeElement !== getElement(\"[data-md-component=search-query]\")) {\n            getElement(\"[data-md-component=search-query]\")!.focus()\n          }\n        }\n      })\n    )\n      .subscribe()\n\n  // TODO: close search on hashchange\n  // anchor jump -> always close drawer + search\n\n  // focus search on reset, on toggle and on keypress if open\n  merge(searchActive$.pipe(filter(identity)), reset$)\n    .pipe(\n      switchMapTo(component<HTMLInputElement>(\"search-query\")),\n      tap(el => el.focus()) // TODO: only if element isnt focused! setFocus? setToggle?\n    )\n      .subscribe()\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Open details before printing */\n  merge(\n    watchMedia(\"print\").pipe(filter(identity)), // Webkit\n    fromEvent(window, \"beforeprint\") // IE, FF\n  )\n    .subscribe(() => {\n      const details = getElements(\"details\")\n      Array.prototype.forEach.call(details, detail => {\n        detail.setAttribute(\"open\", \"\")\n      })\n    })\n\n  // Close drawer and search on hash change\n  agent.location.hash$.subscribe(() => {\n    setToggle(drawer, false)\n    setToggle(search, false) // we probably need to delay the anchor jump for search\n  })\n\n  /* ----------------------------------------------------------------------- */\n\n  /* Clipboard.js integration */\n  if (Clipboard.isSupported()) {\n    const blocks = getElements(\"pre > code\")\n    for (const [index, block] of blocks.entries()) {\n      const parent = block.parentElement!\n      parent.id = `__code_${index}`\n      parent.insertBefore(renderClipboard(parent.id), block)\n    }\n\n    /* Initialize Clipboard listener */\n    const copy = new Clipboard(\".md-clipboard\") // create observable...\n\n    /* Success handler */\n    // copy.on(\"success\", action => {\n    //   alert(\"Copied to clipboard\") // TODO: integrate snackbar\n    //   // TODO: add a snackbar/notification\n\n    // })\n  }\n\n  /* Wrap all data tables for better overflow scrolling */\n  const tables = getElements<HTMLTableElement>(\"table:not([class])\")\n  const placeholder = document.createElement(\"table\")\n  tables.forEach(table => {\n    table.replaceWith(placeholder)\n    placeholder.replaceWith(renderTable(table))\n  })\n\n  // search lock\n  let lastOffset = 0\n  tablet$.pipe(\n    switchMap(active => {\n      return !active ? watchToggle(search) : EMPTY\n    }),\n    switchMap(toggle => {\n      if (toggle) {\n        console.log(\"ACTIVE\")\n        return of(document.body)\n          .pipe(\n            tap(() => lastOffset = window.pageYOffset),\n            delay(400),\n            tap(() => {\n              window.scrollTo(0, 0),\n              console.log(\"scrolled... to top, locked body\")\n              document.body.dataset.mdState = \"lock\"\n            })\n          )\n      } else {\n        console.log(\"INACTIVE\")\n        return of(document.body)\n          .pipe(\n            tap(() => document.body.dataset.mdState = \"\"),\n            delay(100),\n            tap(() => {\n              window.scrollTo(0, lastOffset)\n            })\n          )\n      }\n      return EMPTY\n    })\n  )\n    .subscribe(x => console.log(\"SEARCHLOCK\", x))\n\n  /* ----------------------------------------------------------------------- */\n\n  // get headerHEIGHT! only if header is sticky!\n\n  // // lockHeader at...\n  // const direction$ = agent.viewport.offset$.pipe(\n  //   bufferCount(2, 1), // determine scroll direction\n  //   map(([{ y: y0 }, { y: y1 }]) => y1 > y0),\n  //   distinctUntilChanged(),\n  // )\n\n  // document.body.style.minHeight = \"100vh\"\n\n  // // if true => then + HEADER. otherwise not\n  // let last = 0\n  // combineLatest([direction$, header$]).pipe(\n  //   tap(([direction, { height }]) => { // TODO: only if sticky!\n  //     const offset = 48\n  //     console.log(window.pageYOffset, height, last)\n  //     if (Math.abs(window.pageYOffset - last) < height + offset) { // TODO: add sensitivity offset!\n  //       return\n  //     }\n  //     if (direction) {\n  //       document.body.style.height = `${window.pageYOffset + offset + height}px`\n  //     } else {\n  //       document.body.style.height = `${window.pageYOffset - offset}px` // offset\n  //     }\n  //     last = window.pageYOffset\n  //   })\n  // )\n  //   .subscribe()\n\n  // // toiggle\n\n  /* ----------------------------------------------------------------------- */\n\n  const state = {\n    search: {\n      query$,\n      result$: resultComponent$,\n      reset$,\n    },\n    main$,\n    navigation$,\n    toc$,\n    tabs$,\n    hero$\n  }\n\n  const { search: temp, ...rest } = state\n  merge(...values(rest), ...values(temp))\n    .subscribe() // potential memleak <-- use takeUntil\n\n  return {\n    agent,\n    state\n  }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { keys } from \"ramda\"\nimport { NEVER, Observable, OperatorFunction, of, pipe } from \"rxjs\"\nimport { map, scan, shareReplay, switchMap } from \"rxjs/operators\"\n\nimport { getElement } from \"observables\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Component names\n */\nexport type Component =\n  | \"container\"                        /* Container */\n  | \"header\"                           /* Header */\n  | \"header-title\"                     /* Header title */\n  | \"hero\"                             /* Hero */\n  | \"main\"                             /* Main area */\n  | \"navigation\"                       /* Navigation */\n  | \"search\"                           /* Search */\n  | \"search-query\"                     /* Search input */\n  | \"search-reset\"                     /* Search reset */\n  | \"search-result\"                    /* Search results */\n  | \"tabs\"                             /* Tabs */\n  | \"toc\"                              /* Table of contents */\n\n/**\n * Component map\n */\nexport type ComponentMap = {\n  [P in Component]?: HTMLElement\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  document$: Observable<Document>      /* Document observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch component mapping\n *\n * This function returns an observable that will maintain bindings to the given\n * components in-between document switches and update the document in-place.\n *\n * @param names - Component names\n * @param options - Options\n *\n * @return Component mapping observable\n */\nexport function watchComponentMap(\n  names: Component[], { document$ }: Options\n): Observable<ComponentMap> {\n  const components$ = document$\n    .pipe(\n\n      /* Build component map */\n      map(document => names.reduce<ComponentMap>((components, name) => {\n        const el = getElement(`[data-md-component=${name}]`, document)\n        return {\n          ...components,\n          ...typeof el !== \"undefined\" ? { [name]: el } : {}\n        }\n      }, {})),\n\n      /* Re-compute component map on document switch */\n      scan((prev, next) => {\n        for (const name of keys(prev)) {\n          switch (name) {\n\n            /* Top-level components: update */\n            case \"header-title\":\n            case \"container\":\n              if (name in prev && typeof prev[name] !== \"undefined\") {\n                prev[name]!.replaceWith(next[name]!)\n                prev[name] = next[name]\n              }\n              break\n\n            /* All other components: rebind */\n            default:\n              prev[name] = getElement(`[data-md-component=${name}]`)\n          }\n        }\n        return prev\n      })\n    )\n\n  /* Return component map as hot observable */\n  return components$\n    .pipe(\n      shareReplay(1)\n    )\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Switch to component\n *\n * @template T - Element type\n *\n * @param name - Component name\n *\n * @return Operator function\n */\nexport function switchComponent<T extends HTMLElement>(\n  name: Component\n): OperatorFunction<ComponentMap, T> {\n  return pipe(\n    switchMap(components => {\n      return typeof components[name] !== \"undefined\"\n        ? of(components[name] as T)\n        : NEVER\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  MonoTypeOperatorFunction,\n  animationFrameScheduler,\n  pipe\n} from \"rxjs\"\nimport {\n  distinctUntilKeyChanged,\n  finalize,\n  observeOn,\n  tap\n} from \"rxjs/operators\"\n\nimport { resetHeaderShadow, setHeaderShadow } from \"actions\"\n\nimport { MainState } from \"../../main\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Paint header shadow from source observable\n *\n * @param el - Header element\n *\n * @return Operator function\n */\nexport function paintHeaderShadow(\n  el: HTMLElement\n): MonoTypeOperatorFunction<MainState> {\n  return pipe(\n    distinctUntilKeyChanged(\"active\"),\n\n    /* Defer repaint to next animation frame */\n    observeOn(animationFrameScheduler),\n    tap(({ active }) => {\n      setHeaderShadow(el, active)\n    }),\n\n    /* Reset on complete or error */\n    finalize(() => {\n      resetHeaderShadow(el)\n    })\n  )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Set header shadow\n *\n * @param el - Header element\n * @param value - Whether the shadow is shown\n */\nexport function setHeaderShadow(\n  el: HTMLElement, value: boolean\n): void {\n  el.setAttribute(\"data-md-state\", value ? \"shadow\" : \"\")\n}\n\n/**\n * Reset header shadow\n *\n * @param el - Header element\n */\nexport function resetHeaderShadow(\n  el: HTMLElement\n): void {\n  el.removeAttribute(\"data-md-state\")\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable } from \"rxjs\"\nimport { map } from \"rxjs/operators\"\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Invert boolean value of source observable\n *\n * @param toggle$ - Toggle observable\n *\n * @return Inverted toggle observable\n */\nexport function not(\n  toggle$: Observable<boolean>\n): Observable<boolean> {\n  return toggle$\n    .pipe(\n      map(active => !active)\n    )\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { Observable, combineLatest } from \"rxjs\"\nimport {\n  distinctUntilChanged,\n  map,\n  pluck,\n  shareReplay\n} from \"rxjs/operators\"\n\nimport { ViewportOffset, ViewportSize } from \"../../agent\"\nimport { Header } from \"../../header\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Main area\n */\nexport interface Main {\n  offset: number                       /* Main area top offset */\n  height: number                       /* Main area visible height */\n  active: boolean                      /* Scrolled past top offset */\n}\n\n/* ----------------------------------------------------------------------------\n * Helper types\n * ------------------------------------------------------------------------- */\n\n/**\n * Options\n */\ninterface Options {\n  header$: Observable<Header>          /* Header observable */\n  offset$: Observable<ViewportOffset>  /* Viewport offset observable */\n  size$: Observable<ViewportSize>      /* Viewport size observable */\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Watch main area\n *\n * This function returns an observable that computes the visual parameters of\n * the main area which depends on the viewport height and vertical offset, as\n * well as the height of the header element, if the header is fixed.\n *\n * @param el - Main area element\n * @param options - Options\n *\n * @return Main area observable\n */\nexport function watchMain(\n  el: HTMLElement, { header$, offset$, size$ }: Options\n): Observable<Main> {\n\n  /* Compute necessary adjustment for header */\n  const adjust$ = header$\n    .pipe(\n      pluck(\"height\")\n    )\n\n  /* Compute the main area's visible height */\n  const height$ = combineLatest([offset$, size$, adjust$])\n    .pipe(\n      map(([{ y }, { height }, adjust]) => {\n        const top    = el.offsetTop\n        const bottom = el.offsetHeight + top\n        return height\n          - Math.max(0, top    - y,  adjust)\n          - Math.max(0, height + y - bottom)\n      }),\n      distinctUntilChanged()\n    )\n\n  /* Compute whether the viewport offset is past the main area's top */\n  const active$ = combineLatest([offset$, adjust$])\n    .pipe(\n      map(([{ y }, adjust]) => y >= el.offsetTop - adjust),\n      distinctUntilChanged()\n    )\n\n  /* Combine into a single hot observable */\n  return combineLatest([height$, adjust$, active$])\n    .pipe(\n      map(([height, adjust, active]) => ({\n        offset: el.offsetTop - adjust,\n        height,\n        active\n      })),\n      shareReplay(1)\n    )\n}\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/javascripts/worker/packer.819c2a16.min.js.map b/material/assets/javascripts/worker/packer.819c2a16.min.js.map
deleted file mode 100644
index a95cbf707..000000000
--- a/material/assets/javascripts/worker/packer.819c2a16.min.js.map
+++ /dev/null
@@ -1 +0,0 @@
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You can redistribute it and/or modify it\n// under the terms of the WTFPL, Version 2\n// For more information see LICENSE.txt or http://www.wtfpl.net/\n//\n// For more information, the home page:\n// http://pieroxy.net/blog/pages/lz-string/testing.html\n//\n// LZ-based compression algorithm, version 1.4.4\nvar LZString = (function() {\n\n// private property\nvar f = String.fromCharCode;\nvar keyStrBase64 = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\";\nvar keyStrUriSafe = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-$\";\nvar baseReverseDic = {};\n\nfunction getBaseValue(alphabet, character) {\n  if (!baseReverseDic[alphabet]) {\n    baseReverseDic[alphabet] = {};\n    for (var i=0 ; i<alphabet.length ; i++) {\n      baseReverseDic[alphabet][alphabet.charAt(i)] = i;\n    }\n  }\n  return baseReverseDic[alphabet][character];\n}\n\nvar LZString = {\n  compressToBase64 : function (input) {\n    if (input == null) return \"\";\n    var res = LZString._compress(input, 6, function(a){return keyStrBase64.charAt(a);});\n    switch (res.length % 4) { // To produce valid Base64\n    default: // When could this happen ?\n    case 0 : return res;\n    case 1 : return res+\"===\";\n    case 2 : return res+\"==\";\n    case 3 : return res+\"=\";\n    }\n  },\n\n  decompressFromBase64 : function (input) {\n    if (input == null) return \"\";\n    if (input == \"\") return null;\n    return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrBase64, input.charAt(index)); });\n  },\n\n  compressToUTF16 : function (input) {\n    if (input == null) return \"\";\n    return LZString._compress(input, 15, function(a){return f(a+32);}) + \" \";\n  },\n\n  decompressFromUTF16: function (compressed) {\n    if (compressed == null) return \"\";\n    if (compressed == \"\") return null;\n    return LZString._decompress(compressed.length, 16384, function(index) { return compressed.charCodeAt(index) - 32; });\n  },\n\n  //compress into uint8array (UCS-2 big endian format)\n  compressToUint8Array: function (uncompressed) {\n    var compressed = LZString.compress(uncompressed);\n    var buf=new Uint8Array(compressed.length*2); // 2 bytes per character\n\n    for (var i=0, TotalLen=compressed.length; i<TotalLen; i++) {\n      var current_value = compressed.charCodeAt(i);\n      buf[i*2] = current_value >>> 8;\n      buf[i*2+1] = current_value % 256;\n    }\n    return buf;\n  },\n\n  //decompress from uint8array (UCS-2 big endian format)\n  decompressFromUint8Array:function (compressed) {\n    if (compressed===null || compressed===undefined){\n        return LZString.decompress(compressed);\n    } else {\n        var buf=new Array(compressed.length/2); // 2 bytes per character\n        for (var i=0, TotalLen=buf.length; i<TotalLen; i++) {\n          buf[i]=compressed[i*2]*256+compressed[i*2+1];\n        }\n\n        var result = [];\n        buf.forEach(function (c) {\n          result.push(f(c));\n        });\n        return LZString.decompress(result.join(''));\n\n    }\n\n  },\n\n\n  //compress into a string that is already URI encoded\n  compressToEncodedURIComponent: function (input) {\n    if (input == null) return \"\";\n    return LZString._compress(input, 6, function(a){return keyStrUriSafe.charAt(a);});\n  },\n\n  //decompress from an output of compressToEncodedURIComponent\n  decompressFromEncodedURIComponent:function (input) {\n    if (input == null) return \"\";\n    if (input == \"\") return null;\n    input = input.replace(/ /g, \"+\");\n    return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrUriSafe, input.charAt(index)); });\n  },\n\n  compress: function (uncompressed) {\n    return LZString._compress(uncompressed, 16, function(a){return f(a);});\n  },\n  _compress: function (uncompressed, bitsPerChar, getCharFromInt) {\n    if (uncompressed == null) return \"\";\n    var i, value,\n        context_dictionary= {},\n        context_dictionaryToCreate= {},\n        context_c=\"\",\n        context_wc=\"\",\n        context_w=\"\",\n        context_enlargeIn= 2, // Compensate for the first entry which should not count\n        context_dictSize= 3,\n        context_numBits= 2,\n        context_data=[],\n        context_data_val=0,\n        context_data_position=0,\n        ii;\n\n    for (ii = 0; ii < uncompressed.length; ii += 1) {\n      context_c = uncompressed.charAt(ii);\n      if (!Object.prototype.hasOwnProperty.call(context_dictionary,context_c)) {\n        context_dictionary[context_c] = context_dictSize++;\n        context_dictionaryToCreate[context_c] = true;\n      }\n\n      context_wc = context_w + context_c;\n      if (Object.prototype.hasOwnProperty.call(context_dictionary,context_wc)) {\n        context_w = context_wc;\n      } else {\n        if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {\n          if (context_w.charCodeAt(0)<256) {\n            for (i=0 ; i<context_numBits ; i++) {\n              context_data_val = (context_data_val << 1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n            }\n            value = context_w.charCodeAt(0);\n            for (i=0 ; i<8 ; i++) {\n              context_data_val = (context_data_val << 1) | (value&1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = value >> 1;\n            }\n          } else {\n            value = 1;\n            for (i=0 ; i<context_numBits ; i++) {\n              context_data_val = (context_data_val << 1) | value;\n              if (context_data_position ==bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = 0;\n            }\n            value = context_w.charCodeAt(0);\n            for (i=0 ; i<16 ; i++) {\n              context_data_val = (context_data_val << 1) | (value&1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = value >> 1;\n            }\n          }\n          context_enlargeIn--;\n          if (context_enlargeIn == 0) {\n            context_enlargeIn = Math.pow(2, context_numBits);\n            context_numBits++;\n          }\n          delete context_dictionaryToCreate[context_w];\n        } else {\n          value = context_dictionary[context_w];\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n\n\n        }\n        context_enlargeIn--;\n        if (context_enlargeIn == 0) {\n          context_enlargeIn = Math.pow(2, context_numBits);\n          context_numBits++;\n        }\n        // Add wc to the dictionary.\n        context_dictionary[context_wc] = context_dictSize++;\n        context_w = String(context_c);\n      }\n    }\n\n    // Output the code for w.\n    if (context_w !== \"\") {\n      if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {\n        if (context_w.charCodeAt(0)<256) {\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n          }\n          value = context_w.charCodeAt(0);\n          for (i=0 ; i<8 ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n        } else {\n          value = 1;\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1) | value;\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = 0;\n          }\n          value = context_w.charCodeAt(0);\n          for (i=0 ; i<16 ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n        }\n        context_enlargeIn--;\n        if (context_enlargeIn == 0) {\n          context_enlargeIn = Math.pow(2, context_numBits);\n          context_numBits++;\n        }\n        delete context_dictionaryToCreate[context_w];\n      } else {\n        value = context_dictionary[context_w];\n        for (i=0 ; i<context_numBits ; i++) {\n          context_data_val = (context_data_val << 1) | (value&1);\n          if (context_data_position == bitsPerChar-1) {\n            context_data_position = 0;\n            context_data.push(getCharFromInt(context_data_val));\n            context_data_val = 0;\n          } else {\n            context_data_position++;\n          }\n          value = value >> 1;\n        }\n\n\n      }\n      context_enlargeIn--;\n      if (context_enlargeIn == 0) {\n        context_enlargeIn = Math.pow(2, context_numBits);\n        context_numBits++;\n      }\n    }\n\n    // Mark the end of the stream\n    value = 2;\n    for (i=0 ; i<context_numBits ; i++) {\n      context_data_val = (context_data_val << 1) | (value&1);\n      if (context_data_position == bitsPerChar-1) {\n        context_data_position = 0;\n        context_data.push(getCharFromInt(context_data_val));\n        context_data_val = 0;\n      } else {\n        context_data_position++;\n      }\n      value = value >> 1;\n    }\n\n    // Flush the last char\n    while (true) {\n      context_data_val = (context_data_val << 1);\n      if (context_data_position == bitsPerChar-1) {\n        context_data.push(getCharFromInt(context_data_val));\n        break;\n      }\n      else context_data_position++;\n    }\n    return context_data.join('');\n  },\n\n  decompress: function (compressed) {\n    if (compressed == null) return \"\";\n    if (compressed == \"\") return null;\n    return LZString._decompress(compressed.length, 32768, function(index) { return compressed.charCodeAt(index); });\n  },\n\n  _decompress: function (length, resetValue, getNextValue) {\n    var dictionary = [],\n        next,\n        enlargeIn = 4,\n        dictSize = 4,\n        numBits = 3,\n        entry = \"\",\n        result = [],\n        i,\n        w,\n        bits, resb, maxpower, power,\n        c,\n        data = {val:getNextValue(0), position:resetValue, index:1};\n\n    for (i = 0; i < 3; i += 1) {\n      dictionary[i] = i;\n    }\n\n    bits = 0;\n    maxpower = Math.pow(2,2);\n    power=1;\n    while (power!=maxpower) {\n      resb = data.val & data.position;\n      data.position >>= 1;\n      if (data.position == 0) {\n        data.position = resetValue;\n        data.val = getNextValue(data.index++);\n      }\n      bits |= (resb>0 ? 1 : 0) * power;\n      power <<= 1;\n    }\n\n    switch (next = bits) {\n      case 0:\n          bits = 0;\n          maxpower = Math.pow(2,8);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n        c = f(bits);\n        break;\n      case 1:\n          bits = 0;\n          maxpower = Math.pow(2,16);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n        c = f(bits);\n        break;\n      case 2:\n        return \"\";\n    }\n    dictionary[3] = c;\n    w = c;\n    result.push(c);\n    while (true) {\n      if (data.index > length) {\n        return \"\";\n      }\n\n      bits = 0;\n      maxpower = Math.pow(2,numBits);\n      power=1;\n      while (power!=maxpower) {\n        resb = data.val & data.position;\n        data.position >>= 1;\n        if (data.position == 0) {\n          data.position = resetValue;\n          data.val = getNextValue(data.index++);\n        }\n        bits |= (resb>0 ? 1 : 0) * power;\n        power <<= 1;\n      }\n\n      switch (c = bits) {\n        case 0:\n          bits = 0;\n          maxpower = Math.pow(2,8);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n\n          dictionary[dictSize++] = f(bits);\n          c = dictSize-1;\n          enlargeIn--;\n          break;\n        case 1:\n          bits = 0;\n          maxpower = Math.pow(2,16);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n          dictionary[dictSize++] = f(bits);\n          c = dictSize-1;\n          enlargeIn--;\n          break;\n        case 2:\n          return result.join('');\n      }\n\n      if (enlargeIn == 0) {\n        enlargeIn = Math.pow(2, numBits);\n        numBits++;\n      }\n\n      if (dictionary[c]) {\n        entry = dictionary[c];\n      } else {\n        if (c === dictSize) {\n          entry = w + w.charAt(0);\n        } else {\n          return null;\n        }\n      }\n      result.push(entry);\n\n      // Add w+entry[0] to the dictionary.\n      dictionary[dictSize++] = w + entry.charAt(0);\n      enlargeIn--;\n\n      w = entry;\n\n      if (enlargeIn == 0) {\n        enlargeIn = Math.pow(2, numBits);\n        numBits++;\n      }\n\n    }\n  }\n};\n  return LZString;\n})();\n\nif (typeof define === 'function' && define.amd) {\n  define(function () { return LZString; });\n} else if( typeof module !== 'undefined' && module != null ) {\n  module.exports = LZString\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Packer message type\n */\nexport const enum PackerMessageType {\n  STRING,                              /* String data */\n  BINARY                               /* Packed data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing an unpacked string\n */\nexport interface PackerStringMessage {\n  type: PackerMessageType.STRING       /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing a packed string\n */\nexport interface PackerBinaryMessage {\n  type: PackerMessageType.BINARY       /* Message type */\n  data: string                         /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the packer worker\n */\nexport type PackerMessage =\n  | PackerStringMessage\n  | PackerBinaryMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for packer binary messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerBinaryMessage(\n  message: PackerMessage\n): message is PackerBinaryMessage {\n  return message.type === PackerMessageType.BINARY\n}\n\n/**\n * Type guard for packer string messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerStringMessage(\n  message: PackerMessage\n): message is PackerStringMessage {\n  return message.type === PackerMessageType.STRING\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  compress,\n  compressToUTF16,\n  decompress,\n  decompressFromUTF16\n} from \"lz-string\"\n\nimport { PackerMessage, PackerMessageType } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Determine methods for packing and unpacking\n *\n * While all Webkit-based browsers can store invalid UTF-16 strings in local\n * storage, other browsers may only store valid UTF-16 strings.\n *\n * @see https://bit.ly/2Q1ArhU - LZ-String documentation\n */\nconst isWebkit = navigator.userAgent.includes(\"AppleWebKit\")\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Method for packing\n */\nconst pack = isWebkit\n  ? compress\n  : compressToUTF16\n\n/**\n * Method for unpacking\n */\nconst unpack = isWebkit\n  ? decompress\n  : decompressFromUTF16\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Message handler\n *\n * @param message - Source message\n *\n * @return Target message\n */\nexport function handler(message: PackerMessage): PackerMessage {\n  switch (message.type) {\n\n    /* Pack an unpacked string */\n    case PackerMessageType.STRING:\n      return {\n        type: PackerMessageType.BINARY,\n        data: pack(message.data)\n      }\n\n    /* Unpack a packed string */\n    case PackerMessageType.BINARY:\n      return {\n        type: PackerMessageType.STRING,\n        data: unpack(message.data)\n      }\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Worker\n * ------------------------------------------------------------------------- */\n\nself.addEventListener(\"message\", ev => {\n  self.postMessage(handler(ev.data))\n})\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/javascripts/worker/packer.819c2a16.min.js b/material/assets/javascripts/worker/packer.c14659e8.min.js
similarity index 99%
rename from material/assets/javascripts/worker/packer.819c2a16.min.js
rename to material/assets/javascripts/worker/packer.c14659e8.min.js
index fe54cd0c3..290c6929a 100644
--- a/material/assets/javascripts/worker/packer.819c2a16.min.js
+++ b/material/assets/javascripts/worker/packer.c14659e8.min.js
@@ -1,2 +1,2 @@
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You can redistribute it and/or modify it\n// under the terms of the WTFPL, Version 2\n// For more information see LICENSE.txt or http://www.wtfpl.net/\n//\n// For more information, the home page:\n// http://pieroxy.net/blog/pages/lz-string/testing.html\n//\n// LZ-based compression algorithm, version 1.4.4\nvar LZString = (function() {\n\n// private property\nvar f = String.fromCharCode;\nvar keyStrBase64 = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\";\nvar keyStrUriSafe = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-$\";\nvar baseReverseDic = {};\n\nfunction getBaseValue(alphabet, character) {\n  if (!baseReverseDic[alphabet]) {\n    baseReverseDic[alphabet] = {};\n    for (var i=0 ; i<alphabet.length ; i++) {\n      baseReverseDic[alphabet][alphabet.charAt(i)] = i;\n    }\n  }\n  return baseReverseDic[alphabet][character];\n}\n\nvar LZString = {\n  compressToBase64 : function (input) {\n    if (input == null) return \"\";\n    var res = LZString._compress(input, 6, function(a){return keyStrBase64.charAt(a);});\n    switch (res.length % 4) { // To produce valid Base64\n    default: // When could this happen ?\n    case 0 : return res;\n    case 1 : return res+\"===\";\n    case 2 : return res+\"==\";\n    case 3 : return res+\"=\";\n    }\n  },\n\n  decompressFromBase64 : function (input) {\n    if (input == null) return \"\";\n    if (input == \"\") return null;\n    return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrBase64, input.charAt(index)); });\n  },\n\n  compressToUTF16 : function (input) {\n    if (input == null) return \"\";\n    return LZString._compress(input, 15, function(a){return f(a+32);}) + \" \";\n  },\n\n  decompressFromUTF16: function (compressed) {\n    if (compressed == null) return \"\";\n    if (compressed == \"\") return null;\n    return LZString._decompress(compressed.length, 16384, function(index) { return compressed.charCodeAt(index) - 32; });\n  },\n\n  //compress into uint8array (UCS-2 big endian format)\n  compressToUint8Array: function (uncompressed) {\n    var compressed = LZString.compress(uncompressed);\n    var buf=new Uint8Array(compressed.length*2); // 2 bytes per character\n\n    for (var i=0, TotalLen=compressed.length; i<TotalLen; i++) {\n      var current_value = compressed.charCodeAt(i);\n      buf[i*2] = current_value >>> 8;\n      buf[i*2+1] = current_value % 256;\n    }\n    return buf;\n  },\n\n  //decompress from uint8array (UCS-2 big endian format)\n  decompressFromUint8Array:function (compressed) {\n    if (compressed===null || compressed===undefined){\n        return LZString.decompress(compressed);\n    } else {\n        var buf=new Array(compressed.length/2); // 2 bytes per character\n        for (var i=0, TotalLen=buf.length; i<TotalLen; i++) {\n          buf[i]=compressed[i*2]*256+compressed[i*2+1];\n        }\n\n        var result = [];\n        buf.forEach(function (c) {\n          result.push(f(c));\n        });\n        return LZString.decompress(result.join(''));\n\n    }\n\n  },\n\n\n  //compress into a string that is already URI encoded\n  compressToEncodedURIComponent: function (input) {\n    if (input == null) return \"\";\n    return LZString._compress(input, 6, function(a){return keyStrUriSafe.charAt(a);});\n  },\n\n  //decompress from an output of compressToEncodedURIComponent\n  decompressFromEncodedURIComponent:function (input) {\n    if (input == null) return \"\";\n    if (input == \"\") return null;\n    input = input.replace(/ /g, \"+\");\n    return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrUriSafe, input.charAt(index)); });\n  },\n\n  compress: function (uncompressed) {\n    return LZString._compress(uncompressed, 16, function(a){return f(a);});\n  },\n  _compress: function (uncompressed, bitsPerChar, getCharFromInt) {\n    if (uncompressed == null) return \"\";\n    var i, value,\n        context_dictionary= {},\n        context_dictionaryToCreate= {},\n        context_c=\"\",\n        context_wc=\"\",\n        context_w=\"\",\n        context_enlargeIn= 2, // Compensate for the first entry which should not count\n        context_dictSize= 3,\n        context_numBits= 2,\n        context_data=[],\n        context_data_val=0,\n        context_data_position=0,\n        ii;\n\n    for (ii = 0; ii < uncompressed.length; ii += 1) {\n      context_c = uncompressed.charAt(ii);\n      if (!Object.prototype.hasOwnProperty.call(context_dictionary,context_c)) {\n        context_dictionary[context_c] = context_dictSize++;\n        context_dictionaryToCreate[context_c] = true;\n      }\n\n      context_wc = context_w + context_c;\n      if (Object.prototype.hasOwnProperty.call(context_dictionary,context_wc)) {\n        context_w = context_wc;\n      } else {\n        if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {\n          if (context_w.charCodeAt(0)<256) {\n            for (i=0 ; i<context_numBits ; i++) {\n              context_data_val = (context_data_val << 1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n            }\n            value = context_w.charCodeAt(0);\n            for (i=0 ; i<8 ; i++) {\n              context_data_val = (context_data_val << 1) | (value&1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = value >> 1;\n            }\n          } else {\n            value = 1;\n            for (i=0 ; i<context_numBits ; i++) {\n              context_data_val = (context_data_val << 1) | value;\n              if (context_data_position ==bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = 0;\n            }\n            value = context_w.charCodeAt(0);\n            for (i=0 ; i<16 ; i++) {\n              context_data_val = (context_data_val << 1) | (value&1);\n              if (context_data_position == bitsPerChar-1) {\n                context_data_position = 0;\n                context_data.push(getCharFromInt(context_data_val));\n                context_data_val = 0;\n              } else {\n                context_data_position++;\n              }\n              value = value >> 1;\n            }\n          }\n          context_enlargeIn--;\n          if (context_enlargeIn == 0) {\n            context_enlargeIn = Math.pow(2, context_numBits);\n            context_numBits++;\n          }\n          delete context_dictionaryToCreate[context_w];\n        } else {\n          value = context_dictionary[context_w];\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n\n\n        }\n        context_enlargeIn--;\n        if (context_enlargeIn == 0) {\n          context_enlargeIn = Math.pow(2, context_numBits);\n          context_numBits++;\n        }\n        // Add wc to the dictionary.\n        context_dictionary[context_wc] = context_dictSize++;\n        context_w = String(context_c);\n      }\n    }\n\n    // Output the code for w.\n    if (context_w !== \"\") {\n      if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {\n        if (context_w.charCodeAt(0)<256) {\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n          }\n          value = context_w.charCodeAt(0);\n          for (i=0 ; i<8 ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n        } else {\n          value = 1;\n          for (i=0 ; i<context_numBits ; i++) {\n            context_data_val = (context_data_val << 1) | value;\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = 0;\n          }\n          value = context_w.charCodeAt(0);\n          for (i=0 ; i<16 ; i++) {\n            context_data_val = (context_data_val << 1) | (value&1);\n            if (context_data_position == bitsPerChar-1) {\n              context_data_position = 0;\n              context_data.push(getCharFromInt(context_data_val));\n              context_data_val = 0;\n            } else {\n              context_data_position++;\n            }\n            value = value >> 1;\n          }\n        }\n        context_enlargeIn--;\n        if (context_enlargeIn == 0) {\n          context_enlargeIn = Math.pow(2, context_numBits);\n          context_numBits++;\n        }\n        delete context_dictionaryToCreate[context_w];\n      } else {\n        value = context_dictionary[context_w];\n        for (i=0 ; i<context_numBits ; i++) {\n          context_data_val = (context_data_val << 1) | (value&1);\n          if (context_data_position == bitsPerChar-1) {\n            context_data_position = 0;\n            context_data.push(getCharFromInt(context_data_val));\n            context_data_val = 0;\n          } else {\n            context_data_position++;\n          }\n          value = value >> 1;\n        }\n\n\n      }\n      context_enlargeIn--;\n      if (context_enlargeIn == 0) {\n        context_enlargeIn = Math.pow(2, context_numBits);\n        context_numBits++;\n      }\n    }\n\n    // Mark the end of the stream\n    value = 2;\n    for (i=0 ; i<context_numBits ; i++) {\n      context_data_val = (context_data_val << 1) | (value&1);\n      if (context_data_position == bitsPerChar-1) {\n        context_data_position = 0;\n        context_data.push(getCharFromInt(context_data_val));\n        context_data_val = 0;\n      } else {\n        context_data_position++;\n      }\n      value = value >> 1;\n    }\n\n    // Flush the last char\n    while (true) {\n      context_data_val = (context_data_val << 1);\n      if (context_data_position == bitsPerChar-1) {\n        context_data.push(getCharFromInt(context_data_val));\n        break;\n      }\n      else context_data_position++;\n    }\n    return context_data.join('');\n  },\n\n  decompress: function (compressed) {\n    if (compressed == null) return \"\";\n    if (compressed == \"\") return null;\n    return LZString._decompress(compressed.length, 32768, function(index) { return compressed.charCodeAt(index); });\n  },\n\n  _decompress: function (length, resetValue, getNextValue) {\n    var dictionary = [],\n        next,\n        enlargeIn = 4,\n        dictSize = 4,\n        numBits = 3,\n        entry = \"\",\n        result = [],\n        i,\n        w,\n        bits, resb, maxpower, power,\n        c,\n        data = {val:getNextValue(0), position:resetValue, index:1};\n\n    for (i = 0; i < 3; i += 1) {\n      dictionary[i] = i;\n    }\n\n    bits = 0;\n    maxpower = Math.pow(2,2);\n    power=1;\n    while (power!=maxpower) {\n      resb = data.val & data.position;\n      data.position >>= 1;\n      if (data.position == 0) {\n        data.position = resetValue;\n        data.val = getNextValue(data.index++);\n      }\n      bits |= (resb>0 ? 1 : 0) * power;\n      power <<= 1;\n    }\n\n    switch (next = bits) {\n      case 0:\n          bits = 0;\n          maxpower = Math.pow(2,8);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n        c = f(bits);\n        break;\n      case 1:\n          bits = 0;\n          maxpower = Math.pow(2,16);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n        c = f(bits);\n        break;\n      case 2:\n        return \"\";\n    }\n    dictionary[3] = c;\n    w = c;\n    result.push(c);\n    while (true) {\n      if (data.index > length) {\n        return \"\";\n      }\n\n      bits = 0;\n      maxpower = Math.pow(2,numBits);\n      power=1;\n      while (power!=maxpower) {\n        resb = data.val & data.position;\n        data.position >>= 1;\n        if (data.position == 0) {\n          data.position = resetValue;\n          data.val = getNextValue(data.index++);\n        }\n        bits |= (resb>0 ? 1 : 0) * power;\n        power <<= 1;\n      }\n\n      switch (c = bits) {\n        case 0:\n          bits = 0;\n          maxpower = Math.pow(2,8);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n\n          dictionary[dictSize++] = f(bits);\n          c = dictSize-1;\n          enlargeIn--;\n          break;\n        case 1:\n          bits = 0;\n          maxpower = Math.pow(2,16);\n          power=1;\n          while (power!=maxpower) {\n            resb = data.val & data.position;\n            data.position >>= 1;\n            if (data.position == 0) {\n              data.position = resetValue;\n              data.val = getNextValue(data.index++);\n            }\n            bits |= (resb>0 ? 1 : 0) * power;\n            power <<= 1;\n          }\n          dictionary[dictSize++] = f(bits);\n          c = dictSize-1;\n          enlargeIn--;\n          break;\n        case 2:\n          return result.join('');\n      }\n\n      if (enlargeIn == 0) {\n        enlargeIn = Math.pow(2, numBits);\n        numBits++;\n      }\n\n      if (dictionary[c]) {\n        entry = dictionary[c];\n      } else {\n        if (c === dictSize) {\n          entry = w + w.charAt(0);\n        } else {\n          return null;\n        }\n      }\n      result.push(entry);\n\n      // Add w+entry[0] to the dictionary.\n      dictionary[dictSize++] = w + entry.charAt(0);\n      enlargeIn--;\n\n      w = entry;\n\n      if (enlargeIn == 0) {\n        enlargeIn = Math.pow(2, numBits);\n        numBits++;\n      }\n\n    }\n  }\n};\n  return LZString;\n})();\n\nif (typeof define === 'function' && define.amd) {\n  define(function () { return LZString; });\n} else if( typeof module !== 'undefined' && module != null ) {\n  module.exports = LZString\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Packer message type\n */\nexport const enum PackerMessageType {\n  STRING,                              /* String data */\n  BINARY                               /* Packed data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing an unpacked string\n */\nexport interface PackerStringMessage {\n  type: PackerMessageType.STRING       /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing a packed string\n */\nexport interface PackerBinaryMessage {\n  type: PackerMessageType.BINARY       /* Message type */\n  data: string                         /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the packer worker\n */\nexport type PackerMessage =\n  | PackerStringMessage\n  | PackerBinaryMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for packer binary messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerBinaryMessage(\n  message: PackerMessage\n): message is PackerBinaryMessage {\n  return message.type === PackerMessageType.BINARY\n}\n\n/**\n * Type guard for packer string messages\n *\n * @param message - Packer worker message\n *\n * @return Test result\n */\nexport function isPackerStringMessage(\n  message: PackerMessage\n): message is PackerStringMessage {\n  return message.type === PackerMessageType.STRING\n}\n","\n/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport {\n  compress,\n  compressToUTF16,\n  decompress,\n  decompressFromUTF16\n} from \"lz-string\"\n\nimport { PackerMessage, PackerMessageType } from \"../message\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Determine methods for packing and unpacking\n *\n * While all Webkit-based browsers can store invalid UTF-16 strings in local\n * storage, other browsers may only store valid UTF-16 strings.\n *\n * @see https://bit.ly/2Q1ArhU - LZ-String documentation\n */\nconst isWebkit = navigator.userAgent.includes(\"AppleWebKit\")\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Method for packing\n */\nconst pack = isWebkit\n  ? compress\n  : compressToUTF16\n\n/**\n * Method for unpacking\n */\nconst unpack = isWebkit\n  ? decompress\n  : decompressFromUTF16\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Message handler\n *\n * @param message - Source message\n *\n * @return Target message\n */\nexport function handler(message: PackerMessage): PackerMessage {\n  switch (message.type) {\n\n    /* Pack an unpacked string */\n    case PackerMessageType.STRING:\n      return {\n        type: PackerMessageType.BINARY,\n        data: pack(message.data)\n      }\n\n    /* Unpack a packed string */\n    case PackerMessageType.BINARY:\n      return {\n        type: PackerMessageType.STRING,\n        data: unpack(message.data)\n      }\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Worker\n * ------------------------------------------------------------------------- */\n\nself.addEventListener(\"message\", ev => {\n  self.postMessage(handler(ev.data))\n})\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/javascripts/worker/search.03c9bfda.min.js.map b/material/assets/javascripts/worker/search.03c9bfda.min.js.map
deleted file mode 100644
index dceffed72..000000000
--- a/material/assets/javascripts/worker/search.03c9bfda.min.js.map
+++ /dev/null
@@ -1 +0,0 @@
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5);\n","module.exports = global[\"lunr\"] = require(\"-!./lunr.js\");","/*!\n * escape-html\n * Copyright(c) 2012-2013 TJ Holowaychuk\n * Copyright(c) 2015 Andreas Lubbe\n * Copyright(c) 2015 Tiancheng \"Timothy\" Gu\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module variables.\n * @private\n */\n\nvar matchHtmlRegExp = /[\"'&<>]/;\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = escapeHtml;\n\n/**\n * Escape special characters in the given string of html.\n *\n * @param  {string} string The string to escape for inserting into HTML\n * @return {string}\n * @public\n */\n\nfunction escapeHtml(string) {\n  var str = '' + string;\n  var match = matchHtmlRegExp.exec(str);\n\n  if (!match) {\n    return str;\n  }\n\n  var escape;\n  var html = '';\n  var index = 0;\n  var lastIndex = 0;\n\n  for (index = match.index; index < str.length; index++) {\n    switch (str.charCodeAt(index)) {\n      case 34: // \"\n        escape = '&quot;';\n        break;\n      case 38: // 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(function (global) {\n  /* eslint-disable no-console */\n  return function (message) {\n    if (global.console && console.warn) {\n      console.warn(message)\n    }\n  }\n  /* eslint-enable no-console */\n})(this)\n\n/**\n * Convert an object to a string.\n *\n * In the case of `null` and `undefined` the function returns\n * the empty string, in all other cases the result of calling\n * `toString` on the passed object is returned.\n *\n * @param {Any} obj The object to convert to a string.\n * @return {String} string representation of the passed object.\n * @memberOf lunr.utils\n */\nlunr.utils.asString = function (obj) {\n  if (obj === void 0 || obj === null) {\n    return \"\"\n  } else {\n    return obj.toString()\n  }\n}\n\n/**\n * Clones an object.\n *\n * Will create a copy of an existing object such that any mutations\n * on the copy cannot affect the original.\n *\n * Only shallow objects are supported, passing a nested object to this\n * function will cause a TypeError.\n *\n * Objects with primitives, and arrays of primitives are supported.\n *\n * @param {Object} obj The object to clone.\n * @return {Object} a clone of the passed object.\n * @throws {TypeError} when a nested object is passed.\n * @memberOf Utils\n */\nlunr.utils.clone = function (obj) {\n  if (obj === null || obj === undefined) {\n    return obj\n  }\n\n  var clone = Object.create(null),\n      keys = Object.keys(obj)\n\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i],\n        val = obj[key]\n\n    if (Array.isArray(val)) {\n      clone[key] = val.slice()\n      continue\n    }\n\n    if (typeof val === 'string' ||\n        typeof val === 'number' ||\n        typeof val === 'boolean') {\n      clone[key] = val\n      continue\n    }\n\n    throw new TypeError(\"clone is not deep and does not support nested objects\")\n  }\n\n  return clone\n}\nlunr.FieldRef = function (docRef, fieldName, stringValue) {\n  this.docRef = docRef\n  this.fieldName = fieldName\n  this._stringValue = stringValue\n}\n\nlunr.FieldRef.joiner = \"/\"\n\nlunr.FieldRef.fromString = function (s) {\n  var n = s.indexOf(lunr.FieldRef.joiner)\n\n  if (n === -1) {\n    throw \"malformed field ref string\"\n  }\n\n  var fieldRef = s.slice(0, n),\n      docRef = s.slice(n + 1)\n\n  return new lunr.FieldRef (docRef, fieldRef, s)\n}\n\nlunr.FieldRef.prototype.toString = function () {\n  if (this._stringValue == undefined) {\n    this._stringValue = this.fieldName + lunr.FieldRef.joiner + this.docRef\n  }\n\n  return this._stringValue\n}\n/*!\n * lunr.Set\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A lunr set.\n *\n * @constructor\n */\nlunr.Set = function (elements) {\n  this.elements = Object.create(null)\n\n  if (elements) {\n    this.length = elements.length\n\n    for (var i = 0; i < this.length; i++) {\n      this.elements[elements[i]] = true\n    }\n  } else {\n    this.length = 0\n  }\n}\n\n/**\n * A complete set that contains all elements.\n *\n * @static\n * @readonly\n * @type {lunr.Set}\n */\nlunr.Set.complete = {\n  intersect: function (other) {\n    return other\n  },\n\n  union: function (other) {\n    return other\n  },\n\n  contains: function () {\n    return true\n  }\n}\n\n/**\n * An empty set that contains no elements.\n *\n * @static\n * @readonly\n * @type {lunr.Set}\n */\nlunr.Set.empty = {\n  intersect: function () {\n    return this\n  },\n\n  union: function (other) {\n    return other\n  },\n\n  contains: function () {\n    return false\n  }\n}\n\n/**\n * Returns true if this set contains the specified object.\n *\n * @param {object} object - Object whose presence in this set is to be tested.\n * @returns {boolean} - True if this set contains the specified object.\n */\nlunr.Set.prototype.contains = function (object) {\n  return !!this.elements[object]\n}\n\n/**\n * Returns a new set containing only the elements that are present in both\n * this set and the specified set.\n *\n * @param {lunr.Set} other - set to intersect with this set.\n * @returns {lunr.Set} a new set that is the intersection of this and the specified set.\n */\n\nlunr.Set.prototype.intersect = function (other) {\n  var a, b, elements, intersection = []\n\n  if (other === lunr.Set.complete) {\n    return this\n  }\n\n  if (other === lunr.Set.empty) {\n    return other\n  }\n\n  if (this.length < other.length) {\n    a = this\n    b = other\n  } else {\n    a = other\n    b = this\n  }\n\n  elements = Object.keys(a.elements)\n\n  for (var i = 0; i < elements.length; i++) {\n    var element = elements[i]\n    if (element in b.elements) {\n      intersection.push(element)\n    }\n  }\n\n  return new lunr.Set (intersection)\n}\n\n/**\n * Returns a new set combining the elements of this and the specified set.\n *\n * @param {lunr.Set} other - set to union with this set.\n * @return {lunr.Set} a new set that is the union of this and the specified set.\n */\n\nlunr.Set.prototype.union = function (other) {\n  if (other === lunr.Set.complete) {\n    return lunr.Set.complete\n  }\n\n  if (other === lunr.Set.empty) {\n    return this\n  }\n\n  return new lunr.Set(Object.keys(this.elements).concat(Object.keys(other.elements)))\n}\n/**\n * A function to calculate the inverse document frequency for\n * a posting. This is shared between the builder and the index\n *\n * @private\n * @param {object} posting - The posting for a given term\n * @param {number} documentCount - The total number of documents.\n */\nlunr.idf = function (posting, documentCount) {\n  var documentsWithTerm = 0\n\n  for (var fieldName in posting) {\n    if (fieldName == '_index') continue // Ignore the term index, its not a field\n    documentsWithTerm += Object.keys(posting[fieldName]).length\n  }\n\n  var x = (documentCount - documentsWithTerm + 0.5) / (documentsWithTerm + 0.5)\n\n  return Math.log(1 + Math.abs(x))\n}\n\n/**\n * A token wraps a string representation of a token\n * as it is passed through the text processing pipeline.\n *\n * @constructor\n * @param {string} [str=''] - The string token being wrapped.\n * @param {object} [metadata={}] - Metadata associated with this token.\n */\nlunr.Token = function (str, metadata) {\n  this.str = str || \"\"\n  this.metadata = metadata || {}\n}\n\n/**\n * Returns the token string that is being wrapped by this object.\n *\n * @returns {string}\n */\nlunr.Token.prototype.toString = function () {\n  return this.str\n}\n\n/**\n * A token update function is used when updating or optionally\n * when cloning a token.\n *\n * @callback lunr.Token~updateFunction\n * @param {string} str - The string representation of the token.\n * @param {Object} metadata - All metadata associated with this token.\n */\n\n/**\n * Applies the given function to the wrapped string token.\n *\n * @example\n * token.update(function (str, metadata) {\n *   return str.toUpperCase()\n * })\n *\n * @param {lunr.Token~updateFunction} fn - A function to apply to the token string.\n * @returns {lunr.Token}\n */\nlunr.Token.prototype.update = function (fn) {\n  this.str = fn(this.str, this.metadata)\n  return this\n}\n\n/**\n * Creates a clone of this token. Optionally a function can be\n * applied to the cloned token.\n *\n * @param {lunr.Token~updateFunction} [fn] - An optional function to apply to the cloned token.\n * @returns {lunr.Token}\n */\nlunr.Token.prototype.clone = function (fn) {\n  fn = fn || function (s) { return s }\n  return new lunr.Token (fn(this.str, this.metadata), this.metadata)\n}\n/*!\n * lunr.tokenizer\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A function for splitting a string into tokens ready to be inserted into\n * the search index. Uses `lunr.tokenizer.separator` to split strings, change\n * the value of this property to change how strings are split into tokens.\n *\n * This tokenizer will convert its parameter to a string by calling `toString` and\n * then will split this string on the character in `lunr.tokenizer.separator`.\n * Arrays will have their elements converted to strings and wrapped in a lunr.Token.\n *\n * Optional metadata can be passed to the tokenizer, this metadata will be cloned and\n * added as metadata to every token that is created from the object to be tokenized.\n *\n * @static\n * @param {?(string|object|object[])} obj - The object to convert into tokens\n * @param {?object} metadata - Optional metadata to associate with every token\n * @returns {lunr.Token[]}\n * @see {@link lunr.Pipeline}\n */\nlunr.tokenizer = function (obj, metadata) {\n  if (obj == null || obj == undefined) {\n    return []\n  }\n\n  if (Array.isArray(obj)) {\n    return obj.map(function (t) {\n      return new lunr.Token(\n        lunr.utils.asString(t).toLowerCase(),\n        lunr.utils.clone(metadata)\n      )\n    })\n  }\n\n  var str = obj.toString().toLowerCase(),\n      len = str.length,\n      tokens = []\n\n  for (var sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd++) {\n    var char = str.charAt(sliceEnd),\n        sliceLength = sliceEnd - sliceStart\n\n    if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) {\n\n      if (sliceLength > 0) {\n        var tokenMetadata = lunr.utils.clone(metadata) || {}\n        tokenMetadata[\"position\"] = [sliceStart, sliceLength]\n        tokenMetadata[\"index\"] = tokens.length\n\n        tokens.push(\n          new lunr.Token (\n            str.slice(sliceStart, sliceEnd),\n            tokenMetadata\n          )\n        )\n      }\n\n      sliceStart = sliceEnd + 1\n    }\n\n  }\n\n  return tokens\n}\n\n/**\n * The separator used to split a string into tokens. Override this property to change the behaviour of\n * `lunr.tokenizer` behaviour when tokenizing strings. By default this splits on whitespace and hyphens.\n *\n * @static\n * @see lunr.tokenizer\n */\nlunr.tokenizer.separator = /[\\s\\-]+/\n/*!\n * lunr.Pipeline\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.Pipelines maintain an ordered list of functions to be applied to all\n * tokens in documents entering the search index and queries being ran against\n * the index.\n *\n * An instance of lunr.Index created with the lunr shortcut will contain a\n * pipeline with a stop word filter and an English language stemmer. Extra\n * functions can be added before or after either of these functions or these\n * default functions can be removed.\n *\n * When run the pipeline will call each function in turn, passing a token, the\n * index of that token in the original list of all tokens and finally a list of\n * all the original tokens.\n *\n * The output of functions in the pipeline will be passed to the next function\n * in the pipeline. To exclude a token from entering the index the function\n * should return undefined, the rest of the pipeline will not be called with\n * this token.\n *\n * For serialisation of pipelines to work, all functions used in an instance of\n * a pipeline should be registered with lunr.Pipeline. Registered functions can\n * then be loaded. If trying to load a serialised pipeline that uses functions\n * that are not registered an error will be thrown.\n *\n * If not planning on serialising the pipeline then registering pipeline functions\n * is not necessary.\n *\n * @constructor\n */\nlunr.Pipeline = function () {\n  this._stack = []\n}\n\nlunr.Pipeline.registeredFunctions = Object.create(null)\n\n/**\n * A pipeline function maps lunr.Token to lunr.Token. A lunr.Token contains the token\n * string as well as all known metadata. A pipeline function can mutate the token string\n * or mutate (or add) metadata for a given token.\n *\n * A pipeline function can indicate that the passed token should be discarded by returning\n * null, undefined or an empty string. This token will not be passed to any downstream pipeline\n * functions and will not be added to the index.\n *\n * Multiple tokens can be returned by returning an array of tokens. Each token will be passed\n * to any downstream pipeline functions and all will returned tokens will be added to the index.\n *\n * Any number of pipeline functions may be chained together using a lunr.Pipeline.\n *\n * @interface lunr.PipelineFunction\n * @param {lunr.Token} token - A token from the document being processed.\n * @param {number} i - The index of this token in the complete list of tokens for this document/field.\n * @param {lunr.Token[]} tokens - All tokens for this document/field.\n * @returns {(?lunr.Token|lunr.Token[])}\n */\n\n/**\n * Register a function with the pipeline.\n *\n * Functions that are used in the pipeline should be registered if the pipeline\n * needs to be serialised, or a serialised pipeline needs to be loaded.\n *\n * Registering a function does not add it to a pipeline, functions must still be\n * added to instances of the pipeline for them to be used when running a pipeline.\n *\n * @param {lunr.PipelineFunction} fn - The function to check for.\n * @param {String} label - The label to register this function with\n */\nlunr.Pipeline.registerFunction = function (fn, label) {\n  if (label in this.registeredFunctions) {\n    lunr.utils.warn('Overwriting existing registered function: ' + label)\n  }\n\n  fn.label = label\n  lunr.Pipeline.registeredFunctions[fn.label] = fn\n}\n\n/**\n * Warns if the function is not registered as a Pipeline function.\n *\n * @param {lunr.PipelineFunction} fn - The function to check for.\n * @private\n */\nlunr.Pipeline.warnIfFunctionNotRegistered = function (fn) {\n  var isRegistered = fn.label && (fn.label in this.registeredFunctions)\n\n  if (!isRegistered) {\n    lunr.utils.warn('Function is not registered with pipeline. This may cause problems when serialising the index.\\n', fn)\n  }\n}\n\n/**\n * Loads a previously serialised pipeline.\n *\n * All functions to be loaded must already be registered with lunr.Pipeline.\n * If any function from the serialised data has not been registered then an\n * error will be thrown.\n *\n * @param {Object} serialised - The serialised pipeline to load.\n * @returns {lunr.Pipeline}\n */\nlunr.Pipeline.load = function (serialised) {\n  var pipeline = new lunr.Pipeline\n\n  serialised.forEach(function (fnName) {\n    var fn = lunr.Pipeline.registeredFunctions[fnName]\n\n    if (fn) {\n      pipeline.add(fn)\n    } else {\n      throw new Error('Cannot load unregistered function: ' + fnName)\n    }\n  })\n\n  return pipeline\n}\n\n/**\n * Adds new functions to the end of the pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction[]} functions - Any number of functions to add to the pipeline.\n */\nlunr.Pipeline.prototype.add = function () {\n  var fns = Array.prototype.slice.call(arguments)\n\n  fns.forEach(function (fn) {\n    lunr.Pipeline.warnIfFunctionNotRegistered(fn)\n    this._stack.push(fn)\n  }, this)\n}\n\n/**\n * Adds a single function after a function that already exists in the\n * pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.\n * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.\n */\nlunr.Pipeline.prototype.after = function (existingFn, newFn) {\n  lunr.Pipeline.warnIfFunctionNotRegistered(newFn)\n\n  var pos = this._stack.indexOf(existingFn)\n  if (pos == -1) {\n    throw new Error('Cannot find existingFn')\n  }\n\n  pos = pos + 1\n  this._stack.splice(pos, 0, newFn)\n}\n\n/**\n * Adds a single function before a function that already exists in the\n * pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.\n * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.\n */\nlunr.Pipeline.prototype.before = function (existingFn, newFn) {\n  lunr.Pipeline.warnIfFunctionNotRegistered(newFn)\n\n  var pos = this._stack.indexOf(existingFn)\n  if (pos == -1) {\n    throw new Error('Cannot find existingFn')\n  }\n\n  this._stack.splice(pos, 0, newFn)\n}\n\n/**\n * Removes a function from the pipeline.\n *\n * @param {lunr.PipelineFunction} fn The function to remove from the pipeline.\n */\nlunr.Pipeline.prototype.remove = function (fn) {\n  var pos = this._stack.indexOf(fn)\n  if (pos == -1) {\n    return\n  }\n\n  this._stack.splice(pos, 1)\n}\n\n/**\n * Runs the current list of functions that make up the pipeline against the\n * passed tokens.\n *\n * @param {Array} tokens The tokens to run through the pipeline.\n * @returns {Array}\n */\nlunr.Pipeline.prototype.run = function (tokens) {\n  var stackLength = this._stack.length\n\n  for (var i = 0; i < stackLength; i++) {\n    var fn = this._stack[i]\n    var memo = []\n\n    for (var j = 0; j < tokens.length; j++) {\n      var result = fn(tokens[j], j, tokens)\n\n      if (result === null || result === void 0 || result === '') continue\n\n      if (Array.isArray(result)) {\n        for (var k = 0; k < result.length; k++) {\n          memo.push(result[k])\n        }\n      } else {\n        memo.push(result)\n      }\n    }\n\n    tokens = memo\n  }\n\n  return tokens\n}\n\n/**\n * Convenience method for passing a string through a pipeline and getting\n * strings out. This method takes care of wrapping the passed string in a\n * token and mapping the resulting tokens back to strings.\n *\n * @param {string} str - The string to pass through the pipeline.\n * @param {?object} metadata - Optional metadata to associate with the token\n * passed to the pipeline.\n * @returns {string[]}\n */\nlunr.Pipeline.prototype.runString = function (str, metadata) {\n  var token = new lunr.Token (str, metadata)\n\n  return this.run([token]).map(function (t) {\n    return t.toString()\n  })\n}\n\n/**\n * Resets the pipeline by removing any existing processors.\n *\n */\nlunr.Pipeline.prototype.reset = function () {\n  this._stack = []\n}\n\n/**\n * Returns a representation of the pipeline ready for serialisation.\n *\n * Logs a warning if the function has not been registered.\n *\n * @returns {Array}\n */\nlunr.Pipeline.prototype.toJSON = function () {\n  return this._stack.map(function (fn) {\n    lunr.Pipeline.warnIfFunctionNotRegistered(fn)\n\n    return fn.label\n  })\n}\n/*!\n * lunr.Vector\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A vector is used to construct the vector space of documents and queries. These\n * vectors support operations to determine the similarity between two documents or\n * a document and a query.\n *\n * Normally no parameters are required for initializing a vector, but in the case of\n * loading a previously dumped vector the raw elements can be provided to the constructor.\n *\n * For performance reasons vectors are implemented with a flat array, where an elements\n * index is immediately followed by its value. E.g. [index, value, index, value]. This\n * allows the underlying array to be as sparse as possible and still offer decent\n * performance when being used for vector calculations.\n *\n * @constructor\n * @param {Number[]} [elements] - The flat list of element index and element value pairs.\n */\nlunr.Vector = function (elements) {\n  this._magnitude = 0\n  this.elements = elements || []\n}\n\n\n/**\n * Calculates the position within the vector to insert a given index.\n *\n * This is used internally by insert and upsert. If there are duplicate indexes then\n * the position is returned as if the value for that index were to be updated, but it\n * is the callers responsibility to check whether there is a duplicate at that index\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @returns {Number}\n */\nlunr.Vector.prototype.positionForIndex = function (index) {\n  // For an empty vector the tuple can be inserted at the beginning\n  if (this.elements.length == 0) {\n    return 0\n  }\n\n  var start = 0,\n      end = this.elements.length / 2,\n      sliceLength = end - start,\n      pivotPoint = Math.floor(sliceLength / 2),\n      pivotIndex = this.elements[pivotPoint * 2]\n\n  while (sliceLength > 1) {\n    if (pivotIndex < index) {\n      start = pivotPoint\n    }\n\n    if (pivotIndex > index) {\n      end = pivotPoint\n    }\n\n    if (pivotIndex == index) {\n      break\n    }\n\n    sliceLength = end - start\n    pivotPoint = start + Math.floor(sliceLength / 2)\n    pivotIndex = this.elements[pivotPoint * 2]\n  }\n\n  if (pivotIndex == index) {\n    return pivotPoint * 2\n  }\n\n  if (pivotIndex > index) {\n    return pivotPoint * 2\n  }\n\n  if (pivotIndex < index) {\n    return (pivotPoint + 1) * 2\n  }\n}\n\n/**\n * Inserts an element at an index within the vector.\n *\n * Does not allow duplicates, will throw an error if there is already an entry\n * for this index.\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @param {Number} val - The value to be inserted into the vector.\n */\nlunr.Vector.prototype.insert = function (insertIdx, val) {\n  this.upsert(insertIdx, val, function () {\n    throw \"duplicate index\"\n  })\n}\n\n/**\n * Inserts or updates an existing index within the vector.\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @param {Number} val - The value to be inserted into the vector.\n * @param {function} fn - A function that is called for updates, the existing value and the\n * requested value are passed as arguments\n */\nlunr.Vector.prototype.upsert = function (insertIdx, val, fn) {\n  this._magnitude = 0\n  var position = this.positionForIndex(insertIdx)\n\n  if (this.elements[position] == insertIdx) {\n    this.elements[position + 1] = fn(this.elements[position + 1], val)\n  } else {\n    this.elements.splice(position, 0, insertIdx, val)\n  }\n}\n\n/**\n * Calculates the magnitude of this vector.\n *\n * @returns {Number}\n */\nlunr.Vector.prototype.magnitude = function () {\n  if (this._magnitude) return this._magnitude\n\n  var sumOfSquares = 0,\n      elementsLength = this.elements.length\n\n  for (var i = 1; i < elementsLength; i += 2) {\n    var val = this.elements[i]\n    sumOfSquares += val * val\n  }\n\n  return this._magnitude = Math.sqrt(sumOfSquares)\n}\n\n/**\n * Calculates the dot product of this vector and another vector.\n *\n * @param {lunr.Vector} otherVector - The vector to compute the dot product with.\n * @returns {Number}\n */\nlunr.Vector.prototype.dot = function (otherVector) {\n  var dotProduct = 0,\n      a = this.elements, b = otherVector.elements,\n      aLen = a.length, bLen = b.length,\n      aVal = 0, bVal = 0,\n      i = 0, j = 0\n\n  while (i < aLen && j < bLen) {\n    aVal = a[i], bVal = b[j]\n    if (aVal < bVal) {\n      i += 2\n    } else if (aVal > bVal) {\n      j += 2\n    } else if (aVal == bVal) {\n      dotProduct += a[i + 1] * b[j + 1]\n      i += 2\n      j += 2\n    }\n  }\n\n  return dotProduct\n}\n\n/**\n * Calculates the similarity between this vector and another vector.\n *\n * @param {lunr.Vector} otherVector - The other vector to calculate the\n * similarity with.\n * @returns {Number}\n */\nlunr.Vector.prototype.similarity = function (otherVector) {\n  return this.dot(otherVector) / this.magnitude() || 0\n}\n\n/**\n * Converts the vector to an array of the elements within the vector.\n *\n * @returns {Number[]}\n */\nlunr.Vector.prototype.toArray = function () {\n  var output = new Array (this.elements.length / 2)\n\n  for (var i = 1, j = 0; i < this.elements.length; i += 2, j++) {\n    output[j] = this.elements[i]\n  }\n\n  return output\n}\n\n/**\n * A JSON serializable representation of the vector.\n *\n * @returns {Number[]}\n */\nlunr.Vector.prototype.toJSON = function () {\n  return this.elements\n}\n/* eslint-disable */\n/*!\n * lunr.stemmer\n * Copyright (C) 2019 Oliver Nightingale\n * Includes code from - http://tartarus.org/~martin/PorterStemmer/js.txt\n */\n\n/**\n * lunr.stemmer is an english language stemmer, this is a JavaScript\n * implementation of the PorterStemmer taken from http://tartarus.org/~martin\n *\n * @static\n * @implements {lunr.PipelineFunction}\n * @param {lunr.Token} token - The string to stem\n * @returns {lunr.Token}\n * @see {@link lunr.Pipeline}\n * @function\n */\nlunr.stemmer = (function(){\n  var step2list = {\n      \"ational\" : \"ate\",\n      \"tional\" : \"tion\",\n      \"enci\" : \"ence\",\n      \"anci\" : \"ance\",\n      \"izer\" : \"ize\",\n      \"bli\" : \"ble\",\n      \"alli\" : \"al\",\n      \"entli\" : \"ent\",\n      \"eli\" : \"e\",\n      \"ousli\" : \"ous\",\n      \"ization\" : \"ize\",\n      \"ation\" : \"ate\",\n      \"ator\" : \"ate\",\n      \"alism\" : \"al\",\n      \"iveness\" : \"ive\",\n      \"fulness\" : \"ful\",\n      \"ousness\" : \"ous\",\n      \"aliti\" : \"al\",\n      \"iviti\" : \"ive\",\n      \"biliti\" : \"ble\",\n      \"logi\" : \"log\"\n    },\n\n    step3list = {\n      \"icate\" : \"ic\",\n      \"ative\" : \"\",\n      \"alize\" : \"al\",\n      \"iciti\" : \"ic\",\n      \"ical\" : \"ic\",\n      \"ful\" : \"\",\n      \"ness\" : \"\"\n    },\n\n    c = \"[^aeiou]\",          // consonant\n    v = \"[aeiouy]\",          // vowel\n    C = c + \"[^aeiouy]*\",    // consonant sequence\n    V = v + \"[aeiou]*\",      // vowel sequence\n\n    mgr0 = \"^(\" + C + \")?\" + V + C,               // [C]VC... is m>0\n    meq1 = \"^(\" + C + \")?\" + V + C + \"(\" + V + \")?$\",  // [C]VC[V] is m=1\n    mgr1 = \"^(\" + C + \")?\" + V + C + V + C,       // [C]VCVC... is m>1\n    s_v = \"^(\" + C + \")?\" + v;                   // vowel in stem\n\n  var re_mgr0 = new RegExp(mgr0);\n  var re_mgr1 = new RegExp(mgr1);\n  var re_meq1 = new RegExp(meq1);\n  var re_s_v = new RegExp(s_v);\n\n  var re_1a = /^(.+?)(ss|i)es$/;\n  var re2_1a = /^(.+?)([^s])s$/;\n  var re_1b = /^(.+?)eed$/;\n  var re2_1b = /^(.+?)(ed|ing)$/;\n  var re_1b_2 = /.$/;\n  var re2_1b_2 = /(at|bl|iz)$/;\n  var re3_1b_2 = new RegExp(\"([^aeiouylsz])\\\\1$\");\n  var re4_1b_2 = new RegExp(\"^\" + C + v + \"[^aeiouwxy]$\");\n\n  var re_1c = /^(.+?[^aeiou])y$/;\n  var re_2 = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;\n\n  var re_3 = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;\n\n  var re_4 = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;\n  var re2_4 = /^(.+?)(s|t)(ion)$/;\n\n  var re_5 = /^(.+?)e$/;\n  var re_5_1 = /ll$/;\n  var re3_5 = new RegExp(\"^\" + C + v + \"[^aeiouwxy]$\");\n\n  var porterStemmer = function porterStemmer(w) {\n    var stem,\n      suffix,\n      firstch,\n      re,\n      re2,\n      re3,\n      re4;\n\n    if (w.length < 3) { return w; }\n\n    firstch = w.substr(0,1);\n    if (firstch == \"y\") {\n      w = firstch.toUpperCase() + w.substr(1);\n    }\n\n    // Step 1a\n    re = re_1a\n    re2 = re2_1a;\n\n    if (re.test(w)) { w = w.replace(re,\"$1$2\"); }\n    else if (re2.test(w)) { w = w.replace(re2,\"$1$2\"); }\n\n    // Step 1b\n    re = re_1b;\n    re2 = re2_1b;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      re = re_mgr0;\n      if (re.test(fp[1])) {\n        re = re_1b_2;\n        w = w.replace(re,\"\");\n      }\n    } else if (re2.test(w)) {\n      var fp = re2.exec(w);\n      stem = fp[1];\n      re2 = re_s_v;\n      if (re2.test(stem)) {\n        w = stem;\n        re2 = re2_1b_2;\n        re3 = re3_1b_2;\n        re4 = re4_1b_2;\n        if (re2.test(w)) { w = w + \"e\"; }\n        else if (re3.test(w)) { re = re_1b_2; w = w.replace(re,\"\"); }\n        else if (re4.test(w)) { w = w + \"e\"; }\n      }\n    }\n\n    // Step 1c - replace suffix y or Y by i if preceded by a non-vowel which is not the first letter of the word (so cry -> cri, by -> by, say -> say)\n    re = re_1c;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      w = stem + \"i\";\n    }\n\n    // Step 2\n    re = re_2;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      suffix = fp[2];\n      re = re_mgr0;\n      if (re.test(stem)) {\n        w = stem + step2list[suffix];\n      }\n    }\n\n    // Step 3\n    re = re_3;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      suffix = fp[2];\n      re = re_mgr0;\n      if (re.test(stem)) {\n        w = stem + step3list[suffix];\n      }\n    }\n\n    // Step 4\n    re = re_4;\n    re2 = re2_4;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      re = re_mgr1;\n      if (re.test(stem)) {\n        w = stem;\n      }\n    } else if (re2.test(w)) {\n      var fp = re2.exec(w);\n      stem = fp[1] + fp[2];\n      re2 = re_mgr1;\n      if (re2.test(stem)) {\n        w = stem;\n      }\n    }\n\n    // Step 5\n    re = re_5;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      re = re_mgr1;\n      re2 = re_meq1;\n      re3 = re3_5;\n      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem)))) {\n        w = stem;\n      }\n    }\n\n    re = re_5_1;\n    re2 = re_mgr1;\n    if (re.test(w) && re2.test(w)) {\n      re = re_1b_2;\n      w = w.replace(re,\"\");\n    }\n\n    // and turn initial Y back to y\n\n    if (firstch == \"y\") {\n      w = firstch.toLowerCase() + w.substr(1);\n    }\n\n    return w;\n  };\n\n  return function (token) {\n    return token.update(porterStemmer);\n  }\n})();\n\nlunr.Pipeline.registerFunction(lunr.stemmer, 'stemmer')\n/*!\n * lunr.stopWordFilter\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.generateStopWordFilter builds a stopWordFilter function from the provided\n * list of stop words.\n *\n * The built in lunr.stopWordFilter is built using this generator and can be used\n * to generate custom stopWordFilters for applications or non English languages.\n *\n * @function\n * @param {Array} token The token to pass through the filter\n * @returns {lunr.PipelineFunction}\n * @see lunr.Pipeline\n * @see lunr.stopWordFilter\n */\nlunr.generateStopWordFilter = function (stopWords) {\n  var words = stopWords.reduce(function (memo, stopWord) {\n    memo[stopWord] = stopWord\n    return memo\n  }, {})\n\n  return function (token) {\n    if (token && words[token.toString()] !== token.toString()) return token\n  }\n}\n\n/**\n * lunr.stopWordFilter is an English language stop word list filter, any words\n * contained in the list will not be passed through the filter.\n *\n * This is intended to be used in the Pipeline. If the token does not pass the\n * filter then undefined will be returned.\n *\n * @function\n * @implements {lunr.PipelineFunction}\n * @params {lunr.Token} token - A token to check for being a stop word.\n * @returns {lunr.Token}\n * @see {@link lunr.Pipeline}\n */\nlunr.stopWordFilter = lunr.generateStopWordFilter([\n  'a',\n  'able',\n  'about',\n  'across',\n  'after',\n  'all',\n  'almost',\n  'also',\n  'am',\n  'among',\n  'an',\n  'and',\n  'any',\n  'are',\n  'as',\n  'at',\n  'be',\n  'because',\n  'been',\n  'but',\n  'by',\n  'can',\n  'cannot',\n  'could',\n  'dear',\n  'did',\n  'do',\n  'does',\n  'either',\n  'else',\n  'ever',\n  'every',\n  'for',\n  'from',\n  'get',\n  'got',\n  'had',\n  'has',\n  'have',\n  'he',\n  'her',\n  'hers',\n  'him',\n  'his',\n  'how',\n  'however',\n  'i',\n  'if',\n  'in',\n  'into',\n  'is',\n  'it',\n  'its',\n  'just',\n  'least',\n  'let',\n  'like',\n  'likely',\n  'may',\n  'me',\n  'might',\n  'most',\n  'must',\n  'my',\n  'neither',\n  'no',\n  'nor',\n  'not',\n  'of',\n  'off',\n  'often',\n  'on',\n  'only',\n  'or',\n  'other',\n  'our',\n  'own',\n  'rather',\n  'said',\n  'say',\n  'says',\n  'she',\n  'should',\n  'since',\n  'so',\n  'some',\n  'than',\n  'that',\n  'the',\n  'their',\n  'them',\n  'then',\n  'there',\n  'these',\n  'they',\n  'this',\n  'tis',\n  'to',\n  'too',\n  'twas',\n  'us',\n  'wants',\n  'was',\n  'we',\n  'were',\n  'what',\n  'when',\n  'where',\n  'which',\n  'while',\n  'who',\n  'whom',\n  'why',\n  'will',\n  'with',\n  'would',\n  'yet',\n  'you',\n  'your'\n])\n\nlunr.Pipeline.registerFunction(lunr.stopWordFilter, 'stopWordFilter')\n/*!\n * lunr.trimmer\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.trimmer is a pipeline function for trimming non word\n * characters from the beginning and end of tokens before they\n * enter the index.\n *\n * This implementation may not work correctly for non latin\n * characters and should either be removed or adapted for use\n * with languages with non-latin characters.\n *\n * @static\n * @implements {lunr.PipelineFunction}\n * @param {lunr.Token} token The token to pass through the filter\n * @returns {lunr.Token}\n * @see lunr.Pipeline\n */\nlunr.trimmer = function (token) {\n  return token.update(function (s) {\n    return s.replace(/^\\W+/, '').replace(/\\W+$/, '')\n  })\n}\n\nlunr.Pipeline.registerFunction(lunr.trimmer, 'trimmer')\n/*!\n * lunr.TokenSet\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A token set is used to store the unique list of all tokens\n * within an index. Token sets are also used to represent an\n * incoming query to the index, this query token set and index\n * token set are then intersected to find which tokens to look\n * up in the inverted index.\n *\n * A token set can hold multiple tokens, as in the case of the\n * index token set, or it can hold a single token as in the\n * case of a simple query token set.\n *\n * Additionally token sets are used to perform wildcard matching.\n * Leading, contained and trailing wildcards are supported, and\n * from this edit distance matching can also be provided.\n *\n * Token sets are implemented as a minimal finite state automata,\n * where both common prefixes and suffixes are shared between tokens.\n * This helps to reduce the space used for storing the token set.\n *\n * @constructor\n */\nlunr.TokenSet = function () {\n  this.final = false\n  this.edges = {}\n  this.id = lunr.TokenSet._nextId\n  lunr.TokenSet._nextId += 1\n}\n\n/**\n * Keeps track of the next, auto increment, identifier to assign\n * to a new tokenSet.\n *\n * TokenSets require a unique identifier to be correctly minimised.\n *\n * @private\n */\nlunr.TokenSet._nextId = 1\n\n/**\n * Creates a TokenSet instance from the given sorted array of words.\n *\n * @param {String[]} arr - A sorted array of strings to create the set from.\n * @returns {lunr.TokenSet}\n * @throws Will throw an error if the input array is not sorted.\n */\nlunr.TokenSet.fromArray = function (arr) {\n  var builder = new lunr.TokenSet.Builder\n\n  for (var i = 0, len = arr.length; i < len; i++) {\n    builder.insert(arr[i])\n  }\n\n  builder.finish()\n  return builder.root\n}\n\n/**\n * Creates a token set from a query clause.\n *\n * @private\n * @param {Object} clause - A single clause from lunr.Query.\n * @param {string} clause.term - The query clause term.\n * @param {number} [clause.editDistance] - The optional edit distance for the term.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.fromClause = function (clause) {\n  if ('editDistance' in clause) {\n    return lunr.TokenSet.fromFuzzyString(clause.term, clause.editDistance)\n  } else {\n    return lunr.TokenSet.fromString(clause.term)\n  }\n}\n\n/**\n * Creates a token set representing a single string with a specified\n * edit distance.\n *\n * Insertions, deletions, substitutions and transpositions are each\n * treated as an edit distance of 1.\n *\n * Increasing the allowed edit distance will have a dramatic impact\n * on the performance of both creating and intersecting these TokenSets.\n * It is advised to keep the edit distance less than 3.\n *\n * @param {string} str - The string to create the token set from.\n * @param {number} editDistance - The allowed edit distance to match.\n * @returns {lunr.Vector}\n */\nlunr.TokenSet.fromFuzzyString = function (str, editDistance) {\n  var root = new lunr.TokenSet\n\n  var stack = [{\n    node: root,\n    editsRemaining: editDistance,\n    str: str\n  }]\n\n  while (stack.length) {\n    var frame = stack.pop()\n\n    // no edit\n    if (frame.str.length > 0) {\n      var char = frame.str.charAt(0),\n          noEditNode\n\n      if (char in frame.node.edges) {\n        noEditNode = frame.node.edges[char]\n      } else {\n        noEditNode = new lunr.TokenSet\n        frame.node.edges[char] = noEditNode\n      }\n\n      if (frame.str.length == 1) {\n        noEditNode.final = true\n      }\n\n      stack.push({\n        node: noEditNode,\n        editsRemaining: frame.editsRemaining,\n        str: frame.str.slice(1)\n      })\n    }\n\n    if (frame.editsRemaining == 0) {\n      continue\n    }\n\n    // insertion\n    if (\"*\" in frame.node.edges) {\n      var insertionNode = frame.node.edges[\"*\"]\n    } else {\n      var insertionNode = new lunr.TokenSet\n      frame.node.edges[\"*\"] = insertionNode\n    }\n\n    if (frame.str.length == 0) {\n      insertionNode.final = true\n    }\n\n    stack.push({\n      node: insertionNode,\n      editsRemaining: frame.editsRemaining - 1,\n      str: frame.str\n    })\n\n    // deletion\n    // can only do a deletion if we have enough edits remaining\n    // and if there are characters left to delete in the string\n    if (frame.str.length > 1) {\n      stack.push({\n        node: frame.node,\n        editsRemaining: frame.editsRemaining - 1,\n        str: frame.str.slice(1)\n      })\n    }\n\n    // deletion\n    // just removing the last character from the str\n    if (frame.str.length == 1) {\n      frame.node.final = true\n    }\n\n    // substitution\n    // can only do a substitution if we have enough edits remaining\n    // and if there are characters left to substitute\n    if (frame.str.length >= 1) {\n      if (\"*\" in frame.node.edges) {\n        var substitutionNode = frame.node.edges[\"*\"]\n      } else {\n        var substitutionNode = new lunr.TokenSet\n        frame.node.edges[\"*\"] = substitutionNode\n      }\n\n      if (frame.str.length == 1) {\n        substitutionNode.final = true\n      }\n\n      stack.push({\n        node: substitutionNode,\n        editsRemaining: frame.editsRemaining - 1,\n        str: frame.str.slice(1)\n      })\n    }\n\n    // transposition\n    // can only do a transposition if there are edits remaining\n    // and there are enough characters to transpose\n    if (frame.str.length > 1) {\n      var charA = frame.str.charAt(0),\n          charB = frame.str.charAt(1),\n          transposeNode\n\n      if (charB in frame.node.edges) {\n        transposeNode = frame.node.edges[charB]\n      } else {\n        transposeNode = new lunr.TokenSet\n        frame.node.edges[charB] = transposeNode\n      }\n\n      if (frame.str.length == 1) {\n        transposeNode.final = true\n      }\n\n      stack.push({\n        node: transposeNode,\n        editsRemaining: frame.editsRemaining - 1,\n        str: charA + frame.str.slice(2)\n      })\n    }\n  }\n\n  return root\n}\n\n/**\n * Creates a TokenSet from a string.\n *\n * The string may contain one or more wildcard characters (*)\n * that will allow wildcard matching when intersecting with\n * another TokenSet.\n *\n * @param {string} str - The string to create a TokenSet from.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.fromString = function (str) {\n  var node = new lunr.TokenSet,\n      root = node\n\n  /*\n   * Iterates through all characters within the passed string\n   * appending a node for each character.\n   *\n   * When a wildcard character is found then a self\n   * referencing edge is introduced to continually match\n   * any number of any characters.\n   */\n  for (var i = 0, len = str.length; i < len; i++) {\n    var char = str[i],\n        final = (i == len - 1)\n\n    if (char == \"*\") {\n      node.edges[char] = node\n      node.final = final\n\n    } else {\n      var next = new lunr.TokenSet\n      next.final = final\n\n      node.edges[char] = next\n      node = next\n    }\n  }\n\n  return root\n}\n\n/**\n * Converts this TokenSet into an array of strings\n * contained within the TokenSet.\n *\n * This is not intended to be used on a TokenSet that\n * contains wildcards, in these cases the results are\n * undefined and are likely to cause an infinite loop.\n *\n * @returns {string[]}\n */\nlunr.TokenSet.prototype.toArray = function () {\n  var words = []\n\n  var stack = [{\n    prefix: \"\",\n    node: this\n  }]\n\n  while (stack.length) {\n    var frame = stack.pop(),\n        edges = Object.keys(frame.node.edges),\n        len = edges.length\n\n    if (frame.node.final) {\n      /* In Safari, at this point the prefix is sometimes corrupted, see:\n       * https://github.com/olivernn/lunr.js/issues/279 Calling any\n       * String.prototype method forces Safari to \"cast\" this string to what\n       * it's supposed to be, fixing the bug. */\n      frame.prefix.charAt(0)\n      words.push(frame.prefix)\n    }\n\n    for (var i = 0; i < len; i++) {\n      var edge = edges[i]\n\n      stack.push({\n        prefix: frame.prefix.concat(edge),\n        node: frame.node.edges[edge]\n      })\n    }\n  }\n\n  return words\n}\n\n/**\n * Generates a string representation of a TokenSet.\n *\n * This is intended to allow TokenSets to be used as keys\n * in objects, largely to aid the construction and minimisation\n * of a TokenSet. As such it is not designed to be a human\n * friendly representation of the TokenSet.\n *\n * @returns {string}\n */\nlunr.TokenSet.prototype.toString = function () {\n  // NOTE: Using Object.keys here as this.edges is very likely\n  // to enter 'hash-mode' with many keys being added\n  //\n  // avoiding a for-in loop here as it leads to the function\n  // being de-optimised (at least in V8). From some simple\n  // benchmarks the performance is comparable, but allowing\n  // V8 to optimize may mean easy performance wins in the future.\n\n  if (this._str) {\n    return this._str\n  }\n\n  var str = this.final ? '1' : '0',\n      labels = Object.keys(this.edges).sort(),\n      len = labels.length\n\n  for (var i = 0; i < len; i++) {\n    var label = labels[i],\n        node = this.edges[label]\n\n    str = str + label + node.id\n  }\n\n  return str\n}\n\n/**\n * Returns a new TokenSet that is the intersection of\n * this TokenSet and the passed TokenSet.\n *\n * This intersection will take into account any wildcards\n * contained within the TokenSet.\n *\n * @param {lunr.TokenSet} b - An other TokenSet to intersect with.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.prototype.intersect = function (b) {\n  var output = new lunr.TokenSet,\n      frame = undefined\n\n  var stack = [{\n    qNode: b,\n    output: output,\n    node: this\n  }]\n\n  while (stack.length) {\n    frame = stack.pop()\n\n    // NOTE: As with the #toString method, we are using\n    // Object.keys and a for loop instead of a for-in loop\n    // as both of these objects enter 'hash' mode, causing\n    // the function to be de-optimised in V8\n    var qEdges = Object.keys(frame.qNode.edges),\n        qLen = qEdges.length,\n        nEdges = Object.keys(frame.node.edges),\n        nLen = nEdges.length\n\n    for (var q = 0; q < qLen; q++) {\n      var qEdge = qEdges[q]\n\n      for (var n = 0; n < nLen; n++) {\n        var nEdge = nEdges[n]\n\n        if (nEdge == qEdge || qEdge == '*') {\n          var node = frame.node.edges[nEdge],\n              qNode = frame.qNode.edges[qEdge],\n              final = node.final && qNode.final,\n              next = undefined\n\n          if (nEdge in frame.output.edges) {\n            // an edge already exists for this character\n            // no need to create a new node, just set the finality\n            // bit unless this node is already final\n            next = frame.output.edges[nEdge]\n            next.final = next.final || final\n\n          } else {\n            // no edge exists yet, must create one\n            // set the finality bit and insert it\n            // into the output\n            next = new lunr.TokenSet\n            next.final = final\n            frame.output.edges[nEdge] = next\n          }\n\n          stack.push({\n            qNode: qNode,\n            output: next,\n            node: node\n          })\n        }\n      }\n    }\n  }\n\n  return output\n}\nlunr.TokenSet.Builder = function () {\n  this.previousWord = \"\"\n  this.root = new lunr.TokenSet\n  this.uncheckedNodes = []\n  this.minimizedNodes = {}\n}\n\nlunr.TokenSet.Builder.prototype.insert = function (word) {\n  var node,\n      commonPrefix = 0\n\n  if (word < this.previousWord) {\n    throw new Error (\"Out of order word insertion\")\n  }\n\n  for (var i = 0; i < word.length && i < this.previousWord.length; i++) {\n    if (word[i] != this.previousWord[i]) break\n    commonPrefix++\n  }\n\n  this.minimize(commonPrefix)\n\n  if (this.uncheckedNodes.length == 0) {\n    node = this.root\n  } else {\n    node = this.uncheckedNodes[this.uncheckedNodes.length - 1].child\n  }\n\n  for (var i = commonPrefix; i < word.length; i++) {\n    var nextNode = new lunr.TokenSet,\n        char = word[i]\n\n    node.edges[char] = nextNode\n\n    this.uncheckedNodes.push({\n      parent: node,\n      char: char,\n      child: nextNode\n    })\n\n    node = nextNode\n  }\n\n  node.final = true\n  this.previousWord = word\n}\n\nlunr.TokenSet.Builder.prototype.finish = function () {\n  this.minimize(0)\n}\n\nlunr.TokenSet.Builder.prototype.minimize = function (downTo) {\n  for (var i = this.uncheckedNodes.length - 1; i >= downTo; i--) {\n    var node = this.uncheckedNodes[i],\n        childKey = node.child.toString()\n\n    if (childKey in this.minimizedNodes) {\n      node.parent.edges[node.char] = this.minimizedNodes[childKey]\n    } else {\n      // Cache the key for this node since\n      // we know it can't change anymore\n      node.child._str = childKey\n\n      this.minimizedNodes[childKey] = node.child\n    }\n\n    this.uncheckedNodes.pop()\n  }\n}\n/*!\n * lunr.Index\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * An index contains the built index of all documents and provides a query interface\n * to the index.\n *\n * Usually instances of lunr.Index will not be created using this constructor, instead\n * lunr.Builder should be used to construct new indexes, or lunr.Index.load should be\n * used to load previously built and serialized indexes.\n *\n * @constructor\n * @param {Object} attrs - The attributes of the built search index.\n * @param {Object} attrs.invertedIndex - An index of term/field to document reference.\n * @param {Object<string, lunr.Vector>} attrs.fieldVectors - Field vectors\n * @param {lunr.TokenSet} attrs.tokenSet - An set of all corpus tokens.\n * @param {string[]} attrs.fields - The names of indexed document fields.\n * @param {lunr.Pipeline} attrs.pipeline - The pipeline to use for search terms.\n */\nlunr.Index = function (attrs) {\n  this.invertedIndex = attrs.invertedIndex\n  this.fieldVectors = attrs.fieldVectors\n  this.tokenSet = attrs.tokenSet\n  this.fields = attrs.fields\n  this.pipeline = attrs.pipeline\n}\n\n/**\n * A result contains details of a document matching a search query.\n * @typedef {Object} lunr.Index~Result\n * @property {string} ref - The reference of the document this result represents.\n * @property {number} score - A number between 0 and 1 representing how similar this document is to the query.\n * @property {lunr.MatchData} matchData - Contains metadata about this match including which term(s) caused the match.\n */\n\n/**\n * Although lunr provides the ability to create queries using lunr.Query, it also provides a simple\n * query language which itself is parsed into an instance of lunr.Query.\n *\n * For programmatically building queries it is advised to directly use lunr.Query, the query language\n * is best used for human entered text rather than program generated text.\n *\n * At its simplest queries can just be a single term, e.g. `hello`, multiple terms are also supported\n * and will be combined with OR, e.g `hello world` will match documents that contain either 'hello'\n * or 'world', though those that contain both will rank higher in the results.\n *\n * Wildcards can be included in terms to match one or more unspecified characters, these wildcards can\n * be inserted anywhere within the term, and more than one wildcard can exist in a single term. Adding\n * wildcards will increase the number of documents that will be found but can also have a negative\n * impact on query performance, especially with wildcards at the beginning of a term.\n *\n * Terms can be restricted to specific fields, e.g. `title:hello`, only documents with the term\n * hello in the title field will match this query. Using a field not present in the index will lead\n * to an error being thrown.\n *\n * Modifiers can also be added to terms, lunr supports edit distance and boost modifiers on terms. A term\n * boost will make documents matching that term score higher, e.g. `foo^5`. Edit distance is also supported\n * to provide fuzzy matching, e.g. 'hello~2' will match documents with hello with an edit distance of 2.\n * Avoid large values for edit distance to improve query performance.\n *\n * Each term also supports a presence modifier. By default a term's presence in document is optional, however\n * this can be changed to either required or prohibited. For a term's presence to be required in a document the\n * term should be prefixed with a '+', e.g. `+foo bar` is a search for documents that must contain 'foo' and\n * optionally contain 'bar'. Conversely a leading '-' sets the terms presence to prohibited, i.e. it must not\n * appear in a document, e.g. `-foo bar` is a search for documents that do not contain 'foo' but may contain 'bar'.\n *\n * To escape special characters the backslash character '\\' can be used, this allows searches to include\n * characters that would normally be considered modifiers, e.g. `foo\\~2` will search for a term \"foo~2\" instead\n * of attempting to apply a boost of 2 to the search term \"foo\".\n *\n * @typedef {string} lunr.Index~QueryString\n * @example <caption>Simple single term query</caption>\n * hello\n * @example <caption>Multiple term query</caption>\n * hello world\n * @example <caption>term scoped to a field</caption>\n * title:hello\n * @example <caption>term with a boost of 10</caption>\n * hello^10\n * @example <caption>term with an edit distance of 2</caption>\n * hello~2\n * @example <caption>terms with presence modifiers</caption>\n * -foo +bar baz\n */\n\n/**\n * Performs a search against the index using lunr query syntax.\n *\n * Results will be returned sorted by their score, the most relevant results\n * will be returned first.  For details on how the score is calculated, please see\n * the {@link https://lunrjs.com/guides/searching.html#scoring|guide}.\n *\n * For more programmatic querying use lunr.Index#query.\n *\n * @param {lunr.Index~QueryString} queryString - A string containing a lunr query.\n * @throws {lunr.QueryParseError} If the passed query string cannot be parsed.\n * @returns {lunr.Index~Result[]}\n */\nlunr.Index.prototype.search = function (queryString) {\n  return this.query(function (query) {\n    var parser = new lunr.QueryParser(queryString, query)\n    parser.parse()\n  })\n}\n\n/**\n * A query builder callback provides a query object to be used to express\n * the query to perform on the index.\n *\n * @callback lunr.Index~queryBuilder\n * @param {lunr.Query} query - The query object to build up.\n * @this lunr.Query\n */\n\n/**\n * Performs a query against the index using the yielded lunr.Query object.\n *\n * If performing programmatic queries against the index, this method is preferred\n * over lunr.Index#search so as to avoid the additional query parsing overhead.\n *\n * A query object is yielded to the supplied function which should be used to\n * express the query to be run against the index.\n *\n * Note that although this function takes a callback parameter it is _not_ an\n * asynchronous operation, the callback is just yielded a query object to be\n * customized.\n *\n * @param {lunr.Index~queryBuilder} fn - A function that is used to build the query.\n * @returns {lunr.Index~Result[]}\n */\nlunr.Index.prototype.query = function (fn) {\n  // for each query clause\n  // * process terms\n  // * expand terms from token set\n  // * find matching documents and metadata\n  // * get document vectors\n  // * score documents\n\n  var query = new lunr.Query(this.fields),\n      matchingFields = Object.create(null),\n      queryVectors = Object.create(null),\n      termFieldCache = Object.create(null),\n      requiredMatches = Object.create(null),\n      prohibitedMatches = Object.create(null)\n\n  /*\n   * To support field level boosts a query vector is created per\n   * field. An empty vector is eagerly created to support negated\n   * queries.\n   */\n  for (var i = 0; i < this.fields.length; i++) {\n    queryVectors[this.fields[i]] = new lunr.Vector\n  }\n\n  fn.call(query, query)\n\n  for (var i = 0; i < query.clauses.length; i++) {\n    /*\n     * Unless the pipeline has been disabled for this term, which is\n     * the case for terms with wildcards, we need to pass the clause\n     * term through the search pipeline. A pipeline returns an array\n     * of processed terms. Pipeline functions may expand the passed\n     * term, which means we may end up performing multiple index lookups\n     * for a single query term.\n     */\n    var clause = query.clauses[i],\n        terms = null,\n        clauseMatches = lunr.Set.complete\n\n    if (clause.usePipeline) {\n      terms = this.pipeline.runString(clause.term, {\n        fields: clause.fields\n      })\n    } else {\n      terms = [clause.term]\n    }\n\n    for (var m = 0; m < terms.length; m++) {\n      var term = terms[m]\n\n      /*\n       * Each term returned from the pipeline needs to use the same query\n       * clause object, e.g. the same boost and or edit distance. The\n       * simplest way to do this is to re-use the clause object but mutate\n       * its term property.\n       */\n      clause.term = term\n\n      /*\n       * From the term in the clause we create a token set which will then\n       * be used to intersect the indexes token set to get a list of terms\n       * to lookup in the inverted index\n       */\n      var termTokenSet = lunr.TokenSet.fromClause(clause),\n          expandedTerms = this.tokenSet.intersect(termTokenSet).toArray()\n\n      /*\n       * If a term marked as required does not exist in the tokenSet it is\n       * impossible for the search to return any matches. We set all the field\n       * scoped required matches set to empty and stop examining any further\n       * clauses.\n       */\n      if (expandedTerms.length === 0 && clause.presence === lunr.Query.presence.REQUIRED) {\n        for (var k = 0; k < clause.fields.length; k++) {\n          var field = clause.fields[k]\n          requiredMatches[field] = lunr.Set.empty\n        }\n\n        break\n      }\n\n      for (var j = 0; j < expandedTerms.length; j++) {\n        /*\n         * For each term get the posting and termIndex, this is required for\n         * building the query vector.\n         */\n        var expandedTerm = expandedTerms[j],\n            posting = this.invertedIndex[expandedTerm],\n            termIndex = posting._index\n\n        for (var k = 0; k < clause.fields.length; k++) {\n          /*\n           * For each field that this query term is scoped by (by default\n           * all fields are in scope) we need to get all the document refs\n           * that have this term in that field.\n           *\n           * The posting is the entry in the invertedIndex for the matching\n           * term from above.\n           */\n          var field = clause.fields[k],\n              fieldPosting = posting[field],\n              matchingDocumentRefs = Object.keys(fieldPosting),\n              termField = expandedTerm + \"/\" + field,\n              matchingDocumentsSet = new lunr.Set(matchingDocumentRefs)\n\n          /*\n           * if the presence of this term is required ensure that the matching\n           * documents are added to the set of required matches for this clause.\n           *\n           */\n          if (clause.presence == lunr.Query.presence.REQUIRED) {\n            clauseMatches = clauseMatches.union(matchingDocumentsSet)\n\n            if (requiredMatches[field] === undefined) {\n              requiredMatches[field] = lunr.Set.complete\n            }\n          }\n\n          /*\n           * if the presence of this term is prohibited ensure that the matching\n           * documents are added to the set of prohibited matches for this field,\n           * creating that set if it does not yet exist.\n           */\n          if (clause.presence == lunr.Query.presence.PROHIBITED) {\n            if (prohibitedMatches[field] === undefined) {\n              prohibitedMatches[field] = lunr.Set.empty\n            }\n\n            prohibitedMatches[field] = prohibitedMatches[field].union(matchingDocumentsSet)\n\n            /*\n             * Prohibited matches should not be part of the query vector used for\n             * similarity scoring and no metadata should be extracted so we continue\n             * to the next field\n             */\n            continue\n          }\n\n          /*\n           * The query field vector is populated using the termIndex found for\n           * the term and a unit value with the appropriate boost applied.\n           * Using upsert because there could already be an entry in the vector\n           * for the term we are working with. In that case we just add the scores\n           * together.\n           */\n          queryVectors[field].upsert(termIndex, clause.boost, function (a, b) { return a + b })\n\n          /**\n           * If we've already seen this term, field combo then we've already collected\n           * the matching documents and metadata, no need to go through all that again\n           */\n          if (termFieldCache[termField]) {\n            continue\n          }\n\n          for (var l = 0; l < matchingDocumentRefs.length; l++) {\n            /*\n             * All metadata for this term/field/document triple\n             * are then extracted and collected into an instance\n             * of lunr.MatchData ready to be returned in the query\n             * results\n             */\n            var matchingDocumentRef = matchingDocumentRefs[l],\n                matchingFieldRef = new lunr.FieldRef (matchingDocumentRef, field),\n                metadata = fieldPosting[matchingDocumentRef],\n                fieldMatch\n\n            if ((fieldMatch = matchingFields[matchingFieldRef]) === undefined) {\n              matchingFields[matchingFieldRef] = new lunr.MatchData (expandedTerm, field, metadata)\n            } else {\n              fieldMatch.add(expandedTerm, field, metadata)\n            }\n\n          }\n\n          termFieldCache[termField] = true\n        }\n      }\n    }\n\n    /**\n     * If the presence was required we need to update the requiredMatches field sets.\n     * We do this after all fields for the term have collected their matches because\n     * the clause terms presence is required in _any_ of the fields not _all_ of the\n     * fields.\n     */\n    if (clause.presence === lunr.Query.presence.REQUIRED) {\n      for (var k = 0; k < clause.fields.length; k++) {\n        var field = clause.fields[k]\n        requiredMatches[field] = requiredMatches[field].intersect(clauseMatches)\n      }\n    }\n  }\n\n  /**\n   * Need to combine the field scoped required and prohibited\n   * matching documents into a global set of required and prohibited\n   * matches\n   */\n  var allRequiredMatches = lunr.Set.complete,\n      allProhibitedMatches = lunr.Set.empty\n\n  for (var i = 0; i < this.fields.length; i++) {\n    var field = this.fields[i]\n\n    if (requiredMatches[field]) {\n      allRequiredMatches = allRequiredMatches.intersect(requiredMatches[field])\n    }\n\n    if (prohibitedMatches[field]) {\n      allProhibitedMatches = allProhibitedMatches.union(prohibitedMatches[field])\n    }\n  }\n\n  var matchingFieldRefs = Object.keys(matchingFields),\n      results = [],\n      matches = Object.create(null)\n\n  /*\n   * If the query is negated (contains only prohibited terms)\n   * we need to get _all_ fieldRefs currently existing in the\n   * index. This is only done when we know that the query is\n   * entirely prohibited terms to avoid any cost of getting all\n   * fieldRefs unnecessarily.\n   *\n   * Additionally, blank MatchData must be created to correctly\n   * populate the results.\n   */\n  if (query.isNegated()) {\n    matchingFieldRefs = Object.keys(this.fieldVectors)\n\n    for (var i = 0; i < matchingFieldRefs.length; i++) {\n      var matchingFieldRef = matchingFieldRefs[i]\n      var fieldRef = lunr.FieldRef.fromString(matchingFieldRef)\n      matchingFields[matchingFieldRef] = new lunr.MatchData\n    }\n  }\n\n  for (var i = 0; i < matchingFieldRefs.length; i++) {\n    /*\n     * Currently we have document fields that match the query, but we\n     * need to return documents. The matchData and scores are combined\n     * from multiple fields belonging to the same document.\n     *\n     * Scores are calculated by field, using the query vectors created\n     * above, and combined into a final document score using addition.\n     */\n    var fieldRef = lunr.FieldRef.fromString(matchingFieldRefs[i]),\n        docRef = fieldRef.docRef\n\n    if (!allRequiredMatches.contains(docRef)) {\n      continue\n    }\n\n    if (allProhibitedMatches.contains(docRef)) {\n      continue\n    }\n\n    var fieldVector = this.fieldVectors[fieldRef],\n        score = queryVectors[fieldRef.fieldName].similarity(fieldVector),\n        docMatch\n\n    if ((docMatch = matches[docRef]) !== undefined) {\n      docMatch.score += score\n      docMatch.matchData.combine(matchingFields[fieldRef])\n    } else {\n      var match = {\n        ref: docRef,\n        score: score,\n        matchData: matchingFields[fieldRef]\n      }\n      matches[docRef] = match\n      results.push(match)\n    }\n  }\n\n  /*\n   * Sort the results objects by score, highest first.\n   */\n  return results.sort(function (a, b) {\n    return b.score - a.score\n  })\n}\n\n/**\n * Prepares the index for JSON serialization.\n *\n * The schema for this JSON blob will be described in a\n * separate JSON schema file.\n *\n * @returns {Object}\n */\nlunr.Index.prototype.toJSON = function () {\n  var invertedIndex = Object.keys(this.invertedIndex)\n    .sort()\n    .map(function (term) {\n      return [term, this.invertedIndex[term]]\n    }, this)\n\n  var fieldVectors = Object.keys(this.fieldVectors)\n    .map(function (ref) {\n      return [ref, this.fieldVectors[ref].toJSON()]\n    }, this)\n\n  return {\n    version: lunr.version,\n    fields: this.fields,\n    fieldVectors: fieldVectors,\n    invertedIndex: invertedIndex,\n    pipeline: this.pipeline.toJSON()\n  }\n}\n\n/**\n * Loads a previously serialized lunr.Index\n *\n * @param {Object} serializedIndex - A previously serialized lunr.Index\n * @returns {lunr.Index}\n */\nlunr.Index.load = function (serializedIndex) {\n  var attrs = {},\n      fieldVectors = {},\n      serializedVectors = serializedIndex.fieldVectors,\n      invertedIndex = Object.create(null),\n      serializedInvertedIndex = serializedIndex.invertedIndex,\n      tokenSetBuilder = new lunr.TokenSet.Builder,\n      pipeline = lunr.Pipeline.load(serializedIndex.pipeline)\n\n  if (serializedIndex.version != lunr.version) {\n    lunr.utils.warn(\"Version mismatch when loading serialised index. Current version of lunr '\" + lunr.version + \"' does not match serialized index '\" + serializedIndex.version + \"'\")\n  }\n\n  for (var i = 0; i < serializedVectors.length; i++) {\n    var tuple = serializedVectors[i],\n        ref = tuple[0],\n        elements = tuple[1]\n\n    fieldVectors[ref] = new lunr.Vector(elements)\n  }\n\n  for (var i = 0; i < serializedInvertedIndex.length; i++) {\n    var tuple = serializedInvertedIndex[i],\n        term = tuple[0],\n        posting = tuple[1]\n\n    tokenSetBuilder.insert(term)\n    invertedIndex[term] = posting\n  }\n\n  tokenSetBuilder.finish()\n\n  attrs.fields = serializedIndex.fields\n\n  attrs.fieldVectors = fieldVectors\n  attrs.invertedIndex = invertedIndex\n  attrs.tokenSet = tokenSetBuilder.root\n  attrs.pipeline = pipeline\n\n  return new lunr.Index(attrs)\n}\n/*!\n * lunr.Builder\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.Builder performs indexing on a set of documents and\n * returns instances of lunr.Index ready for querying.\n *\n * All configuration of the index is done via the builder, the\n * fields to index, the document reference, the text processing\n * pipeline and document scoring parameters are all set on the\n * builder before indexing.\n *\n * @constructor\n * @property {string} _ref - Internal reference to the document reference field.\n * @property {string[]} _fields - Internal reference to the document fields to index.\n * @property {object} invertedIndex - The inverted index maps terms to document fields.\n * @property {object} documentTermFrequencies - Keeps track of document term frequencies.\n * @property {object} documentLengths - Keeps track of the length of documents added to the index.\n * @property {lunr.tokenizer} tokenizer - Function for splitting strings into tokens for indexing.\n * @property {lunr.Pipeline} pipeline - The pipeline performs text processing on tokens before indexing.\n * @property {lunr.Pipeline} searchPipeline - A pipeline for processing search terms before querying the index.\n * @property {number} documentCount - Keeps track of the total number of documents indexed.\n * @property {number} _b - A parameter to control field length normalization, setting this to 0 disabled normalization, 1 fully normalizes field lengths, the default value is 0.75.\n * @property {number} _k1 - A parameter to control how quickly an increase in term frequency results in term frequency saturation, the default value is 1.2.\n * @property {number} termIndex - A counter incremented for each unique term, used to identify a terms position in the vector space.\n * @property {array} metadataWhitelist - A list of metadata keys that have been whitelisted for entry in the index.\n */\nlunr.Builder = function () {\n  this._ref = \"id\"\n  this._fields = Object.create(null)\n  this._documents = Object.create(null)\n  this.invertedIndex = Object.create(null)\n  this.fieldTermFrequencies = {}\n  this.fieldLengths = {}\n  this.tokenizer = lunr.tokenizer\n  this.pipeline = new lunr.Pipeline\n  this.searchPipeline = new lunr.Pipeline\n  this.documentCount = 0\n  this._b = 0.75\n  this._k1 = 1.2\n  this.termIndex = 0\n  this.metadataWhitelist = []\n}\n\n/**\n * Sets the document field used as the document reference. Every document must have this field.\n * The type of this field in the document should be a string, if it is not a string it will be\n * coerced into a string by calling toString.\n *\n * The default ref is 'id'.\n *\n * The ref should _not_ be changed during indexing, it should be set before any documents are\n * added to the index. Changing it during indexing can lead to inconsistent results.\n *\n * @param {string} ref - The name of the reference field in the document.\n */\nlunr.Builder.prototype.ref = function (ref) {\n  this._ref = ref\n}\n\n/**\n * A function that is used to extract a field from a document.\n *\n * Lunr expects a field to be at the top level of a document, if however the field\n * is deeply nested within a document an extractor function can be used to extract\n * the right field for indexing.\n *\n * @callback fieldExtractor\n * @param {object} doc - The document being added to the index.\n * @returns {?(string|object|object[])} obj - The object that will be indexed for this field.\n * @example <caption>Extracting a nested field</caption>\n * function (doc) { return doc.nested.field }\n */\n\n/**\n * Adds a field to the list of document fields that will be indexed. Every document being\n * indexed should have this field. Null values for this field in indexed documents will\n * not cause errors but will limit the chance of that document being retrieved by searches.\n *\n * All fields should be added before adding documents to the index. Adding fields after\n * a document has been indexed will have no effect on already indexed documents.\n *\n * Fields can be boosted at build time. This allows terms within that field to have more\n * importance when ranking search results. Use a field boost to specify that matches within\n * one field are more important than other fields.\n *\n * @param {string} fieldName - The name of a field to index in all documents.\n * @param {object} attributes - Optional attributes associated with this field.\n * @param {number} [attributes.boost=1] - Boost applied to all terms within this field.\n * @param {fieldExtractor} [attributes.extractor] - Function to extract a field from a document.\n * @throws {RangeError} fieldName cannot contain unsupported characters '/'\n */\nlunr.Builder.prototype.field = function (fieldName, attributes) {\n  if (/\\//.test(fieldName)) {\n    throw new RangeError (\"Field '\" + fieldName + \"' contains illegal character '/'\")\n  }\n\n  this._fields[fieldName] = attributes || {}\n}\n\n/**\n * A parameter to tune the amount of field length normalisation that is applied when\n * calculating relevance scores. A value of 0 will completely disable any normalisation\n * and a value of 1 will fully normalise field lengths. The default is 0.75. Values of b\n * will be clamped to the range 0 - 1.\n *\n * @param {number} number - The value to set for this tuning parameter.\n */\nlunr.Builder.prototype.b = function (number) {\n  if (number < 0) {\n    this._b = 0\n  } else if (number > 1) {\n    this._b = 1\n  } else {\n    this._b = number\n  }\n}\n\n/**\n * A parameter that controls the speed at which a rise in term frequency results in term\n * frequency saturation. The default value is 1.2. Setting this to a higher value will give\n * slower saturation levels, a lower value will result in quicker saturation.\n *\n * @param {number} number - The value to set for this tuning parameter.\n */\nlunr.Builder.prototype.k1 = function (number) {\n  this._k1 = number\n}\n\n/**\n * Adds a document to the index.\n *\n * Before adding fields to the index the index should have been fully setup, with the document\n * ref and all fields to index already having been specified.\n *\n * The document must have a field name as specified by the ref (by default this is 'id') and\n * it should have all fields defined for indexing, though null or undefined values will not\n * cause errors.\n *\n * Entire documents can be boosted at build time. Applying a boost to a document indicates that\n * this document should rank higher in search results than other documents.\n *\n * @param {object} doc - The document to add to the index.\n * @param {object} attributes - Optional attributes associated with this document.\n * @param {number} [attributes.boost=1] - Boost applied to all terms within this document.\n */\nlunr.Builder.prototype.add = function (doc, attributes) {\n  var docRef = doc[this._ref],\n      fields = Object.keys(this._fields)\n\n  this._documents[docRef] = attributes || {}\n  this.documentCount += 1\n\n  for (var i = 0; i < fields.length; i++) {\n    var fieldName = fields[i],\n        extractor = this._fields[fieldName].extractor,\n        field = extractor ? extractor(doc) : doc[fieldName],\n        tokens = this.tokenizer(field, {\n          fields: [fieldName]\n        }),\n        terms = this.pipeline.run(tokens),\n        fieldRef = new lunr.FieldRef (docRef, fieldName),\n        fieldTerms = Object.create(null)\n\n    this.fieldTermFrequencies[fieldRef] = fieldTerms\n    this.fieldLengths[fieldRef] = 0\n\n    // store the length of this field for this document\n    this.fieldLengths[fieldRef] += terms.length\n\n    // calculate term frequencies for this field\n    for (var j = 0; j < terms.length; j++) {\n      var term = terms[j]\n\n      if (fieldTerms[term] == undefined) {\n        fieldTerms[term] = 0\n      }\n\n      fieldTerms[term] += 1\n\n      // add to inverted index\n      // create an initial posting if one doesn't exist\n      if (this.invertedIndex[term] == undefined) {\n        var posting = Object.create(null)\n        posting[\"_index\"] = this.termIndex\n        this.termIndex += 1\n\n        for (var k = 0; k < fields.length; k++) {\n          posting[fields[k]] = Object.create(null)\n        }\n\n        this.invertedIndex[term] = posting\n      }\n\n      // add an entry for this term/fieldName/docRef to the invertedIndex\n      if (this.invertedIndex[term][fieldName][docRef] == undefined) {\n        this.invertedIndex[term][fieldName][docRef] = Object.create(null)\n      }\n\n      // store all whitelisted metadata about this token in the\n      // inverted index\n      for (var l = 0; l < this.metadataWhitelist.length; l++) {\n        var metadataKey = this.metadataWhitelist[l],\n            metadata = term.metadata[metadataKey]\n\n        if (this.invertedIndex[term][fieldName][docRef][metadataKey] == undefined) {\n          this.invertedIndex[term][fieldName][docRef][metadataKey] = []\n        }\n\n        this.invertedIndex[term][fieldName][docRef][metadataKey].push(metadata)\n      }\n    }\n\n  }\n}\n\n/**\n * Calculates the average document length for this index\n *\n * @private\n */\nlunr.Builder.prototype.calculateAverageFieldLengths = function () {\n\n  var fieldRefs = Object.keys(this.fieldLengths),\n      numberOfFields = fieldRefs.length,\n      accumulator = {},\n      documentsWithField = {}\n\n  for (var i = 0; i < numberOfFields; i++) {\n    var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]),\n        field = fieldRef.fieldName\n\n    documentsWithField[field] || (documentsWithField[field] = 0)\n    documentsWithField[field] += 1\n\n    accumulator[field] || (accumulator[field] = 0)\n    accumulator[field] += this.fieldLengths[fieldRef]\n  }\n\n  var fields = Object.keys(this._fields)\n\n  for (var i = 0; i < fields.length; i++) {\n    var fieldName = fields[i]\n    accumulator[fieldName] = accumulator[fieldName] / documentsWithField[fieldName]\n  }\n\n  this.averageFieldLength = accumulator\n}\n\n/**\n * Builds a vector space model of every document using lunr.Vector\n *\n * @private\n */\nlunr.Builder.prototype.createFieldVectors = function () {\n  var fieldVectors = {},\n      fieldRefs = Object.keys(this.fieldTermFrequencies),\n      fieldRefsLength = fieldRefs.length,\n      termIdfCache = Object.create(null)\n\n  for (var i = 0; i < fieldRefsLength; i++) {\n    var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]),\n        fieldName = fieldRef.fieldName,\n        fieldLength = this.fieldLengths[fieldRef],\n        fieldVector = new lunr.Vector,\n        termFrequencies = this.fieldTermFrequencies[fieldRef],\n        terms = Object.keys(termFrequencies),\n        termsLength = terms.length\n\n\n    var fieldBoost = this._fields[fieldName].boost || 1,\n        docBoost = this._documents[fieldRef.docRef].boost || 1\n\n    for (var j = 0; j < termsLength; j++) {\n      var term = terms[j],\n          tf = termFrequencies[term],\n          termIndex = this.invertedIndex[term]._index,\n          idf, score, scoreWithPrecision\n\n      if (termIdfCache[term] === undefined) {\n        idf = lunr.idf(this.invertedIndex[term], this.documentCount)\n        termIdfCache[term] = idf\n      } else {\n        idf = termIdfCache[term]\n      }\n\n      score = idf * ((this._k1 + 1) * tf) / (this._k1 * (1 - this._b + this._b * (fieldLength / this.averageFieldLength[fieldName])) + tf)\n      score *= fieldBoost\n      score *= docBoost\n      scoreWithPrecision = Math.round(score * 1000) / 1000\n      // Converts 1.23456789 to 1.234.\n      // Reducing the precision so that the vectors take up less\n      // space when serialised. Doing it now so that they behave\n      // the same before and after serialisation. Also, this is\n      // the fastest approach to reducing a number's precision in\n      // JavaScript.\n\n      fieldVector.insert(termIndex, scoreWithPrecision)\n    }\n\n    fieldVectors[fieldRef] = fieldVector\n  }\n\n  this.fieldVectors = fieldVectors\n}\n\n/**\n * Creates a token set of all tokens in the index using lunr.TokenSet\n *\n * @private\n */\nlunr.Builder.prototype.createTokenSet = function () {\n  this.tokenSet = lunr.TokenSet.fromArray(\n    Object.keys(this.invertedIndex).sort()\n  )\n}\n\n/**\n * Builds the index, creating an instance of lunr.Index.\n *\n * This completes the indexing process and should only be called\n * once all documents have been added to the index.\n *\n * @returns {lunr.Index}\n */\nlunr.Builder.prototype.build = function () {\n  this.calculateAverageFieldLengths()\n  this.createFieldVectors()\n  this.createTokenSet()\n\n  return new lunr.Index({\n    invertedIndex: this.invertedIndex,\n    fieldVectors: this.fieldVectors,\n    tokenSet: this.tokenSet,\n    fields: Object.keys(this._fields),\n    pipeline: this.searchPipeline\n  })\n}\n\n/**\n * Applies a plugin to the index builder.\n *\n * A plugin is a function that is called with the index builder as its context.\n * Plugins can be used to customise or extend the behaviour of the index\n * in some way. A plugin is just a function, that encapsulated the custom\n * behaviour that should be applied when building the index.\n *\n * The plugin function will be called with the index builder as its argument, additional\n * arguments can also be passed when calling use. The function will be called\n * with the index builder as its context.\n *\n * @param {Function} plugin The plugin to apply.\n */\nlunr.Builder.prototype.use = function (fn) {\n  var args = Array.prototype.slice.call(arguments, 1)\n  args.unshift(this)\n  fn.apply(this, args)\n}\n/**\n * Contains and collects metadata about a matching document.\n * A single instance of lunr.MatchData is returned as part of every\n * lunr.Index~Result.\n *\n * @constructor\n * @param {string} term - The term this match data is associated with\n * @param {string} field - The field in which the term was found\n * @param {object} metadata - The metadata recorded about this term in this field\n * @property {object} metadata - A cloned collection of metadata associated with this document.\n * @see {@link lunr.Index~Result}\n */\nlunr.MatchData = function (term, field, metadata) {\n  var clonedMetadata = Object.create(null),\n      metadataKeys = Object.keys(metadata || {})\n\n  // Cloning the metadata to prevent the original\n  // being mutated during match data combination.\n  // Metadata is kept in an array within the inverted\n  // index so cloning the data can be done with\n  // Array#slice\n  for (var i = 0; i < metadataKeys.length; i++) {\n    var key = metadataKeys[i]\n    clonedMetadata[key] = metadata[key].slice()\n  }\n\n  this.metadata = Object.create(null)\n\n  if (term !== undefined) {\n    this.metadata[term] = Object.create(null)\n    this.metadata[term][field] = clonedMetadata\n  }\n}\n\n/**\n * An instance of lunr.MatchData will be created for every term that matches a\n * document. However only one instance is required in a lunr.Index~Result. This\n * method combines metadata from another instance of lunr.MatchData with this\n * objects metadata.\n *\n * @param {lunr.MatchData} otherMatchData - Another instance of match data to merge with this one.\n * @see {@link lunr.Index~Result}\n */\nlunr.MatchData.prototype.combine = function (otherMatchData) {\n  var terms = Object.keys(otherMatchData.metadata)\n\n  for (var i = 0; i < terms.length; i++) {\n    var term = terms[i],\n        fields = Object.keys(otherMatchData.metadata[term])\n\n    if (this.metadata[term] == undefined) {\n      this.metadata[term] = Object.create(null)\n    }\n\n    for (var j = 0; j < fields.length; j++) {\n      var field = fields[j],\n          keys = Object.keys(otherMatchData.metadata[term][field])\n\n      if (this.metadata[term][field] == undefined) {\n        this.metadata[term][field] = Object.create(null)\n      }\n\n      for (var k = 0; k < keys.length; k++) {\n        var key = keys[k]\n\n        if (this.metadata[term][field][key] == undefined) {\n          this.metadata[term][field][key] = otherMatchData.metadata[term][field][key]\n        } else {\n          this.metadata[term][field][key] = this.metadata[term][field][key].concat(otherMatchData.metadata[term][field][key])\n        }\n\n      }\n    }\n  }\n}\n\n/**\n * Add metadata for a term/field pair to this instance of match data.\n *\n * @param {string} term - The term this match data is associated with\n * @param {string} field - The field in which the term was found\n * @param {object} metadata - The metadata recorded about this term in this field\n */\nlunr.MatchData.prototype.add = function (term, field, metadata) {\n  if (!(term in this.metadata)) {\n    this.metadata[term] = Object.create(null)\n    this.metadata[term][field] = metadata\n    return\n  }\n\n  if (!(field in this.metadata[term])) {\n    this.metadata[term][field] = metadata\n    return\n  }\n\n  var metadataKeys = Object.keys(metadata)\n\n  for (var i = 0; i < metadataKeys.length; i++) {\n    var key = metadataKeys[i]\n\n    if (key in this.metadata[term][field]) {\n      this.metadata[term][field][key] = this.metadata[term][field][key].concat(metadata[key])\n    } else {\n      this.metadata[term][field][key] = metadata[key]\n    }\n  }\n}\n/**\n * A lunr.Query provides a programmatic way of defining queries to be performed\n * against a {@link lunr.Index}.\n *\n * Prefer constructing a lunr.Query using the {@link lunr.Index#query} method\n * so the query object is pre-initialized with the right index fields.\n *\n * @constructor\n * @property {lunr.Query~Clause[]} clauses - An array of query clauses.\n * @property {string[]} allFields - An array of all available fields in a lunr.Index.\n */\nlunr.Query = function (allFields) {\n  this.clauses = []\n  this.allFields = allFields\n}\n\n/**\n * Constants for indicating what kind of automatic wildcard insertion will be used when constructing a query clause.\n *\n * This allows wildcards to be added to the beginning and end of a term without having to manually do any string\n * concatenation.\n *\n * The wildcard constants can be bitwise combined to select both leading and trailing wildcards.\n *\n * @constant\n * @default\n * @property {number} wildcard.NONE - The term will have no wildcards inserted, this is the default behaviour\n * @property {number} wildcard.LEADING - Prepend the term with a wildcard, unless a leading wildcard already exists\n * @property {number} wildcard.TRAILING - Append a wildcard to the term, unless a trailing wildcard already exists\n * @see lunr.Query~Clause\n * @see lunr.Query#clause\n * @see lunr.Query#term\n * @example <caption>query term with trailing wildcard</caption>\n * query.term('foo', { wildcard: lunr.Query.wildcard.TRAILING })\n * @example <caption>query term with leading and trailing wildcard</caption>\n * query.term('foo', {\n *   wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING\n * })\n */\n\nlunr.Query.wildcard = new String (\"*\")\nlunr.Query.wildcard.NONE = 0\nlunr.Query.wildcard.LEADING = 1\nlunr.Query.wildcard.TRAILING = 2\n\n/**\n * Constants for indicating what kind of presence a term must have in matching documents.\n *\n * @constant\n * @enum {number}\n * @see lunr.Query~Clause\n * @see lunr.Query#clause\n * @see lunr.Query#term\n * @example <caption>query term with required presence</caption>\n * query.term('foo', { presence: lunr.Query.presence.REQUIRED })\n */\nlunr.Query.presence = {\n  /**\n   * Term's presence in a document is optional, this is the default value.\n   */\n  OPTIONAL: 1,\n\n  /**\n   * Term's presence in a document is required, documents that do not contain\n   * this term will not be returned.\n   */\n  REQUIRED: 2,\n\n  /**\n   * Term's presence in a document is prohibited, documents that do contain\n   * this term will not be returned.\n   */\n  PROHIBITED: 3\n}\n\n/**\n * A single clause in a {@link lunr.Query} contains a term and details on how to\n * match that term against a {@link lunr.Index}.\n *\n * @typedef {Object} lunr.Query~Clause\n * @property {string[]} fields - The fields in an index this clause should be matched against.\n * @property {number} [boost=1] - Any boost that should be applied when matching this clause.\n * @property {number} [editDistance] - Whether the term should have fuzzy matching applied, and how fuzzy the match should be.\n * @property {boolean} [usePipeline] - Whether the term should be passed through the search pipeline.\n * @property {number} [wildcard=lunr.Query.wildcard.NONE] - Whether the term should have wildcards appended or prepended.\n * @property {number} [presence=lunr.Query.presence.OPTIONAL] - The terms presence in any matching documents.\n */\n\n/**\n * Adds a {@link lunr.Query~Clause} to this query.\n *\n * Unless the clause contains the fields to be matched all fields will be matched. In addition\n * a default boost of 1 is applied to the clause.\n *\n * @param {lunr.Query~Clause} clause - The clause to add to this query.\n * @see lunr.Query~Clause\n * @returns {lunr.Query}\n */\nlunr.Query.prototype.clause = function (clause) {\n  if (!('fields' in clause)) {\n    clause.fields = this.allFields\n  }\n\n  if (!('boost' in clause)) {\n    clause.boost = 1\n  }\n\n  if (!('usePipeline' in clause)) {\n    clause.usePipeline = true\n  }\n\n  if (!('wildcard' in clause)) {\n    clause.wildcard = lunr.Query.wildcard.NONE\n  }\n\n  if ((clause.wildcard & lunr.Query.wildcard.LEADING) && (clause.term.charAt(0) != lunr.Query.wildcard)) {\n    clause.term = \"*\" + clause.term\n  }\n\n  if ((clause.wildcard & lunr.Query.wildcard.TRAILING) && (clause.term.slice(-1) != lunr.Query.wildcard)) {\n    clause.term = \"\" + clause.term + \"*\"\n  }\n\n  if (!('presence' in clause)) {\n    clause.presence = lunr.Query.presence.OPTIONAL\n  }\n\n  this.clauses.push(clause)\n\n  return this\n}\n\n/**\n * A negated query is one in which every clause has a presence of\n * prohibited. These queries require some special processing to return\n * the expected results.\n *\n * @returns boolean\n */\nlunr.Query.prototype.isNegated = function () {\n  for (var i = 0; i < this.clauses.length; i++) {\n    if (this.clauses[i].presence != lunr.Query.presence.PROHIBITED) {\n      return false\n    }\n  }\n\n  return true\n}\n\n/**\n * Adds a term to the current query, under the covers this will create a {@link lunr.Query~Clause}\n * to the list of clauses that make up this query.\n *\n * The term is used as is, i.e. no tokenization will be performed by this method. Instead conversion\n * to a token or token-like string should be done before calling this method.\n *\n * The term will be converted to a string by calling `toString`. Multiple terms can be passed as an\n * array, each term in the array will share the same options.\n *\n * @param {object|object[]} term - The term(s) to add to the query.\n * @param {object} [options] - Any additional properties to add to the query clause.\n * @returns {lunr.Query}\n * @see lunr.Query#clause\n * @see lunr.Query~Clause\n * @example <caption>adding a single term to a query</caption>\n * query.term(\"foo\")\n * @example <caption>adding a single term to a query and specifying search fields, term boost and automatic trailing wildcard</caption>\n * query.term(\"foo\", {\n *   fields: [\"title\"],\n *   boost: 10,\n *   wildcard: lunr.Query.wildcard.TRAILING\n * })\n * @example <caption>using lunr.tokenizer to convert a string to tokens before using them as terms</caption>\n * query.term(lunr.tokenizer(\"foo bar\"))\n */\nlunr.Query.prototype.term = function (term, options) {\n  if (Array.isArray(term)) {\n    term.forEach(function (t) { this.term(t, lunr.utils.clone(options)) }, this)\n    return this\n  }\n\n  var clause = options || {}\n  clause.term = term.toString()\n\n  this.clause(clause)\n\n  return this\n}\nlunr.QueryParseError = function (message, start, end) {\n  this.name = \"QueryParseError\"\n  this.message = message\n  this.start = start\n  this.end = end\n}\n\nlunr.QueryParseError.prototype = new Error\nlunr.QueryLexer = function (str) {\n  this.lexemes = []\n  this.str = str\n  this.length = str.length\n  this.pos = 0\n  this.start = 0\n  this.escapeCharPositions = []\n}\n\nlunr.QueryLexer.prototype.run = function () {\n  var state = lunr.QueryLexer.lexText\n\n  while (state) {\n    state = state(this)\n  }\n}\n\nlunr.QueryLexer.prototype.sliceString = function () {\n  var subSlices = [],\n      sliceStart = this.start,\n      sliceEnd = this.pos\n\n  for (var i = 0; i < this.escapeCharPositions.length; i++) {\n    sliceEnd = this.escapeCharPositions[i]\n    subSlices.push(this.str.slice(sliceStart, sliceEnd))\n    sliceStart = sliceEnd + 1\n  }\n\n  subSlices.push(this.str.slice(sliceStart, this.pos))\n  this.escapeCharPositions.length = 0\n\n  return subSlices.join('')\n}\n\nlunr.QueryLexer.prototype.emit = function (type) {\n  this.lexemes.push({\n    type: type,\n    str: this.sliceString(),\n    start: this.start,\n    end: this.pos\n  })\n\n  this.start = this.pos\n}\n\nlunr.QueryLexer.prototype.escapeCharacter = function () {\n  this.escapeCharPositions.push(this.pos - 1)\n  this.pos += 1\n}\n\nlunr.QueryLexer.prototype.next = function () {\n  if (this.pos >= this.length) {\n    return lunr.QueryLexer.EOS\n  }\n\n  var char = this.str.charAt(this.pos)\n  this.pos += 1\n  return char\n}\n\nlunr.QueryLexer.prototype.width = function () {\n  return this.pos - this.start\n}\n\nlunr.QueryLexer.prototype.ignore = function () {\n  if (this.start == this.pos) {\n    this.pos += 1\n  }\n\n  this.start = this.pos\n}\n\nlunr.QueryLexer.prototype.backup = function () {\n  this.pos -= 1\n}\n\nlunr.QueryLexer.prototype.acceptDigitRun = function () {\n  var char, charCode\n\n  do {\n    char = this.next()\n    charCode = char.charCodeAt(0)\n  } while (charCode > 47 && charCode < 58)\n\n  if (char != lunr.QueryLexer.EOS) {\n    this.backup()\n  }\n}\n\nlunr.QueryLexer.prototype.more = function () {\n  return this.pos < this.length\n}\n\nlunr.QueryLexer.EOS = 'EOS'\nlunr.QueryLexer.FIELD = 'FIELD'\nlunr.QueryLexer.TERM = 'TERM'\nlunr.QueryLexer.EDIT_DISTANCE = 'EDIT_DISTANCE'\nlunr.QueryLexer.BOOST = 'BOOST'\nlunr.QueryLexer.PRESENCE = 'PRESENCE'\n\nlunr.QueryLexer.lexField = function (lexer) {\n  lexer.backup()\n  lexer.emit(lunr.QueryLexer.FIELD)\n  lexer.ignore()\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexTerm = function (lexer) {\n  if (lexer.width() > 1) {\n    lexer.backup()\n    lexer.emit(lunr.QueryLexer.TERM)\n  }\n\n  lexer.ignore()\n\n  if (lexer.more()) {\n    return lunr.QueryLexer.lexText\n  }\n}\n\nlunr.QueryLexer.lexEditDistance = function (lexer) {\n  lexer.ignore()\n  lexer.acceptDigitRun()\n  lexer.emit(lunr.QueryLexer.EDIT_DISTANCE)\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexBoost = function (lexer) {\n  lexer.ignore()\n  lexer.acceptDigitRun()\n  lexer.emit(lunr.QueryLexer.BOOST)\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexEOS = function (lexer) {\n  if (lexer.width() > 0) {\n    lexer.emit(lunr.QueryLexer.TERM)\n  }\n}\n\n// This matches the separator used when tokenising fields\n// within a document. These should match otherwise it is\n// not possible to search for some tokens within a document.\n//\n// It is possible for the user to change the separator on the\n// tokenizer so it _might_ clash with any other of the special\n// characters already used within the search string, e.g. :.\n//\n// This means that it is possible to change the separator in\n// such a way that makes some words unsearchable using a search\n// string.\nlunr.QueryLexer.termSeparator = lunr.tokenizer.separator\n\nlunr.QueryLexer.lexText = function (lexer) {\n  while (true) {\n    var char = lexer.next()\n\n    if (char == lunr.QueryLexer.EOS) {\n      return lunr.QueryLexer.lexEOS\n    }\n\n    // Escape character is '\\'\n    if (char.charCodeAt(0) == 92) {\n      lexer.escapeCharacter()\n      continue\n    }\n\n    if (char == \":\") {\n      return lunr.QueryLexer.lexField\n    }\n\n    if (char == \"~\") {\n      lexer.backup()\n      if (lexer.width() > 0) {\n        lexer.emit(lunr.QueryLexer.TERM)\n      }\n      return lunr.QueryLexer.lexEditDistance\n    }\n\n    if (char == \"^\") {\n      lexer.backup()\n      if (lexer.width() > 0) {\n        lexer.emit(lunr.QueryLexer.TERM)\n      }\n      return lunr.QueryLexer.lexBoost\n    }\n\n    // \"+\" indicates term presence is required\n    // checking for length to ensure that only\n    // leading \"+\" are considered\n    if (char == \"+\" && lexer.width() === 1) {\n      lexer.emit(lunr.QueryLexer.PRESENCE)\n      return lunr.QueryLexer.lexText\n    }\n\n    // \"-\" indicates term presence is prohibited\n    // checking for length to ensure that only\n    // leading \"-\" are considered\n    if (char == \"-\" && lexer.width() === 1) {\n      lexer.emit(lunr.QueryLexer.PRESENCE)\n      return lunr.QueryLexer.lexText\n    }\n\n    if (char.match(lunr.QueryLexer.termSeparator)) {\n      return lunr.QueryLexer.lexTerm\n    }\n  }\n}\n\nlunr.QueryParser = function (str, query) {\n  this.lexer = new lunr.QueryLexer (str)\n  this.query = query\n  this.currentClause = {}\n  this.lexemeIdx = 0\n}\n\nlunr.QueryParser.prototype.parse = function () {\n  this.lexer.run()\n  this.lexemes = this.lexer.lexemes\n\n  var state = lunr.QueryParser.parseClause\n\n  while (state) {\n    state = state(this)\n  }\n\n  return this.query\n}\n\nlunr.QueryParser.prototype.peekLexeme = function () {\n  return this.lexemes[this.lexemeIdx]\n}\n\nlunr.QueryParser.prototype.consumeLexeme = function () {\n  var lexeme = this.peekLexeme()\n  this.lexemeIdx += 1\n  return lexeme\n}\n\nlunr.QueryParser.prototype.nextClause = function () {\n  var completedClause = this.currentClause\n  this.query.clause(completedClause)\n  this.currentClause = {}\n}\n\nlunr.QueryParser.parseClause = function (parser) {\n  var lexeme = parser.peekLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  switch (lexeme.type) {\n    case lunr.QueryLexer.PRESENCE:\n      return lunr.QueryParser.parsePresence\n    case lunr.QueryLexer.FIELD:\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expected either a field or a term, found \" + lexeme.type\n\n      if (lexeme.str.length >= 1) {\n        errorMessage += \" with value '\" + lexeme.str + \"'\"\n      }\n\n      throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n}\n\nlunr.QueryParser.parsePresence = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  switch (lexeme.str) {\n    case \"-\":\n      parser.currentClause.presence = lunr.Query.presence.PROHIBITED\n      break\n    case \"+\":\n      parser.currentClause.presence = lunr.Query.presence.REQUIRED\n      break\n    default:\n      var errorMessage = \"unrecognised presence operator'\" + lexeme.str + \"'\"\n      throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    var errorMessage = \"expecting term or field, found nothing\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.FIELD:\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expecting term or field, found '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseField = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  if (parser.query.allFields.indexOf(lexeme.str) == -1) {\n    var possibleFields = parser.query.allFields.map(function (f) { return \"'\" + f + \"'\" }).join(', '),\n        errorMessage = \"unrecognised field '\" + lexeme.str + \"', possible fields: \" + possibleFields\n\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.fields = [lexeme.str]\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    var errorMessage = \"expecting term, found nothing\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expecting term, found '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseTerm = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  parser.currentClause.term = lexeme.str.toLowerCase()\n\n  if (lexeme.str.indexOf(\"*\") != -1) {\n    parser.currentClause.usePipeline = false\n  }\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseEditDistance = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  var editDistance = parseInt(lexeme.str, 10)\n\n  if (isNaN(editDistance)) {\n    var errorMessage = \"edit distance must be numeric\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.editDistance = editDistance\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseBoost = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  var boost = parseInt(lexeme.str, 10)\n\n  if (isNaN(boost)) {\n    var errorMessage = \"boost must be numeric\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.boost = boost\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\n  /**\n   * export the module via AMD, CommonJS or as a browser global\n   * Export code from https://github.com/umdjs/umd/blob/master/returnExports.js\n   */\n  ;(function (root, factory) {\n    if (typeof define === 'function' && define.amd) {\n      // AMD. Register as an anonymous module.\n      define(factory)\n    } else if (typeof exports === 'object') {\n      /**\n       * Node. Does not work with strict CommonJS, but\n       * only CommonJS-like enviroments that support module.exports,\n       * like Node.\n       */\n      module.exports = factory()\n    } else {\n      // Browser globals (root is window)\n      root.lunr = factory()\n    }\n  }(this, function () {\n    /**\n     * Just return a value to define the module export.\n     * This example returns an object, but the module\n     * can return a function as the exported value.\n     */\n    return lunr\n  }))\n})();\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndexOptions, SearchResult } from \"modules\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search message type\n */\nexport const enum SearchMessageType {\n  SETUP,                               /* Search index setup */\n  DUMP,                                /* Search index dump */\n  QUERY,                               /* Search query */\n  RESULT                               /* Search results */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing the data necessary to setup the search index\n */\nexport interface SearchSetupMessage {\n  type: SearchMessageType.SETUP        /* Message type */\n  data: SearchIndexOptions             /* Message data */\n}\n\n/**\n * A message containing the a dump of the search index\n */\nexport interface SearchDumpMessage {\n  type: SearchMessageType.DUMP        /* Message type */\n  data: string                        /* Message data */\n}\n\n/**\n * A message containing a search query\n */\nexport interface SearchQueryMessage {\n  type: SearchMessageType.QUERY        /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing results for a search query\n */\nexport interface SearchResultMessage {\n  type: SearchMessageType.RESULT       /* Message type */\n  data: SearchResult[]                 /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the search worker\n */\nexport type SearchMessage =\n  | SearchSetupMessage\n  | SearchDumpMessage\n  | SearchQueryMessage\n  | SearchResultMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for search setup messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchSetupMessage(\n  message: SearchMessage\n): message is SearchSetupMessage {\n  return message.type === SearchMessageType.SETUP\n}\n\n/**\n * Type guard for search dump messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchDumpMessage(\n  message: SearchMessage\n): message is SearchDumpMessage {\n  return message.type === SearchMessageType.DUMP\n}\n\n/**\n * Type guard for search query messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchQueryMessage(\n  message: SearchMessage\n): message is SearchQueryMessage {\n  return message.type === SearchMessageType.QUERY\n}\n\n/**\n * Type guard for search result messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchResultMessage(\n  message: SearchMessage\n): message is SearchResultMessage {\n  return message.type === SearchMessageType.RESULT\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as lunr from \"expose-loader?lunr!lunr\"\n\nimport {\n  ArticleDocument,\n  SearchDocumentMap,\n  SectionDocument,\n  setupSearchDocumentMap\n} from \"../document\"\nimport {\n  SearchHighlightFactoryFn,\n  setupSearchHighlighter\n} from \"../highlight\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search index configuration\n */\nexport interface SearchIndexConfig {\n  lang: string[]                       /* Search languages */\n  separator: string                    /* Search separator */\n}\n\n/**\n * Search index document\n */\nexport interface SearchIndexDocument {\n  location: string                     /* Document location */\n  title: string                        /* Document title */\n  text: string                         /* Document text */\n}\n\n/**\n * Search index pipeline\n */\nexport interface SearchIndexPipeline {\n  trimmer: boolean                     /* Add trimmer to pipeline */\n  stopwords: boolean                   /* Add stopword filter to pipeline */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search index options\n *\n * This interfaces describes the format of the `search_index.json` file which\n * is automatically built by the MkDocs search plugin.\n */\nexport interface SearchIndexOptions {\n  config: SearchIndexConfig            /* Search index configuration */\n  docs: SearchIndexDocument[]          /* Search index documents */\n  pipeline?: SearchIndexPipeline       /* Search index pipeline */\n  index?: object | string              /* Prebuilt or serialized index */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search result\n */\nexport interface SearchResult {\n  article: ArticleDocument             /* Article document */\n  sections: SectionDocument[]          /* Section documents */\n}\n\n/* ----------------------------------------------------------------------------\n * Class\n * ------------------------------------------------------------------------- */\n\nexport class SearchIndex {\n\n  /**\n   * Search document mapping\n   *\n   * A mapping of URLs (including hash fragments) to the actual articles and\n   * sections of the documentation. The search document mapping must be created\n   * regardless of whether the index was prebuilt or not, as lunr itself will\n   * only store the actual index.\n   */\n  protected documents: SearchDocumentMap\n\n  /**\n   * Search highlight factory function\n   */\n  protected highlight: SearchHighlightFactoryFn\n\n  /**\n   * The lunr search index\n   */\n  protected index: lunr.Index\n\n  /**\n   * Create a search index\n   *\n   * @param options - Options\n   */\n  public constructor({ config, docs, pipeline, index }: SearchIndexOptions) {\n    this.documents = setupSearchDocumentMap(docs)\n    this.highlight = setupSearchHighlighter(config)\n\n    /* If no index was given, create it */\n    if (typeof index === \"undefined\") {\n      this.index = lunr(function() {\n        pipeline = pipeline || {\n          trimmer: true,\n          stopwords: true\n        }\n\n        /* Remove stemmer, as it cripples search experience */\n        this.pipeline.reset()\n        if (pipeline.trimmer)\n          this.pipeline.add(lunr.trimmer)\n        if (pipeline.stopwords)\n          this.pipeline.add(lunr.stopWordFilter)\n\n        /* Set up alternate search languages */\n        if (config.lang.length === 1 && config.lang[0] !== \"en\") {\n          this.use((lunr as any)[config.lang[0]])\n        } else if (config.lang.length > 1) {\n          this.use((lunr as any).multiLanguage(...config.lang))\n        }\n\n        /* Setup fields and reference */\n        this.field(\"title\", { boost: 10 })\n        this.field(\"text\")\n        this.ref(\"location\")\n\n        /* Index documents */\n        for (const doc of docs)\n          this.add(doc)\n      })\n\n    /* Prebuilt or serialized index */\n    } else {\n      this.index = lunr.Index.load(\n        typeof index === \"string\"\n          ? JSON.parse(index)\n          : index\n      )\n    }\n  }\n\n  /**\n   * Search for matching documents\n   *\n   * The search index which MkDocs provides is divided up into articles, which\n   * contain the whole content of the individual pages, and sections, which only\n   * contain the contents of the subsections obtained by breaking the individual\n   * pages up at `h1` ... `h6`. As there may be many sections on different pages\n   * with indentical titles (for example within this very project, e.g. \"Usage\"\n   * or \"Installation\"), they need to be put into the context of the containing\n   * page. For this reason, section results are grouped within their respective\n   * articles which are the top-level results that are returned.\n   *\n   * @param query - Query string\n   *\n   * @return Search results\n   */\n  public search(query: string): SearchResult[] {\n    if (query) {\n      try {\n\n        /* Group sections by containing article */\n        const groups = this.index.search(query)\n          .reduce((results, result) => {\n            const document = this.documents.get(result.ref)\n            if (typeof document !== \"undefined\") {\n              if (\"parent\" in document) {\n                const ref = document.parent.location\n                results.set(ref, [...results.get(ref) || [], result])\n              } else {\n                const ref = document.location\n                results.set(ref, results.get(ref) || [])\n              }\n            }\n            return results\n          }, new Map<string, lunr.Index.Result[]>())\n\n        /* Create highlighter for query */\n        const fn = this.highlight(query)\n\n        /* Map groups to search documents */\n        return [...groups].map(([ref, sections]) => ({\n          article: fn(this.documents.get(ref) as ArticleDocument),\n          sections: sections.map(section => {\n            return fn(this.documents.get(section.ref) as SectionDocument)\n          })\n        }))\n\n      /* Log errors to console (for now) */\n      } catch (err) {\n        // tslint:disable-next-line no-console\n        console.warn(`Invalid query: ${query} – see https://bit.ly/2s3ChXG`)\n      }\n    }\n\n    /* Return nothing in case of error or empty query */\n    return []\n  }\n\n  /**\n   * Serialize search index\n   *\n   * @return String representation\n   */\n  public toString(): string {\n    return JSON.stringify(this.index)\n  }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as escapeHTML from \"escape-html\"\n\nimport { SearchIndexDocument } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * A top-level article\n */\nexport interface ArticleDocument extends SearchIndexDocument {\n  linked: boolean                      /* Whether the section was linked */\n}\n\n/**\n * A section of an article\n */\nexport interface SectionDocument extends SearchIndexDocument {\n  parent: ArticleDocument              /* Parent article */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search document\n */\nexport type SearchDocument =\n  | ArticleDocument\n  | SectionDocument\n\n/**\n * Search document mapping\n */\nexport type SearchDocumentMap = Map<string, SearchDocument>\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Create a search document mapping\n *\n * @param docs - Search index documents\n *\n * @return Search document map\n */\nexport function setupSearchDocumentMap(\n  docs: SearchIndexDocument[]\n): SearchDocumentMap {\n  const documents = new Map<string, SearchDocument>()\n  for (const doc of docs) {\n    const [path, hash] = doc.location.split(\"#\")\n\n    /* Extract location and title */\n    const location = doc.location\n    const title    = doc.title\n\n    /* Escape and cleanup text */\n    const text = escapeHTML(doc.text)\n      .replace(/\\s+(?=[,.:;!?])/g, \"\")\n      .replace(/\\s+/g, \" \")\n\n    /* Handle section */\n    if (hash) {\n      const parent = documents.get(path) as ArticleDocument\n\n      /* Ignore first section, override article */\n      if (!parent.linked) {\n        parent.title  = doc.title\n        parent.text   = text\n        parent.linked = true\n\n      /* Add subsequent section */\n      } else {\n        documents.set(location, {\n          location,\n          title,\n          text,\n          parent\n        })\n      }\n\n    /* Add article */\n    } else {\n      documents.set(location, {\n        location,\n        title,\n        text,\n        linked: false\n      })\n    }\n  }\n  return documents\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as escapeRegExp from \"escape-string-regexp\"\n\nimport { SearchIndexConfig } from \"../_\"\nimport { SearchDocument } from \"../document\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search highlight function\n *\n * @template T - Search document type\n *\n * @param document - Search document\n *\n * @return Highlighted document\n */\nexport type SearchHighlightFn =\n  <T extends SearchDocument>(document: Readonly<T>) => T\n\n/**\n * Search highlight factory function\n *\n * @param query - Query string\n *\n * @return Search highlight function\n */\nexport type SearchHighlightFactoryFn =\n  (query: string) => SearchHighlightFn\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Create a search highlighter\n *\n * @param config - Search index configuration\n *\n * @return Search highlight factory function\n */\nexport function setupSearchHighlighter(\n  config: SearchIndexConfig\n): SearchHighlightFactoryFn {\n  const separator = new RegExp(config.separator, \"img\")\n  const highlight = (_: unknown, data: string, term: string) => {\n    return `${data}<em>${term}</em>`\n  }\n\n  /* Return factory function */\n  return (query: string) => {\n    query = query\n      .replace(/[\\s*+-:~^]+/g, \" \")\n      .trim()\n\n    /* Create search term match expression */\n    const match = new RegExp(`(^|${config.separator})(${\n      escapeRegExp(query).replace(separator, \"|\")\n    })`, \"img\")\n\n    /* Highlight document */\n    return document => ({\n      ...document,\n      title: document.title.replace(match, highlight),\n      text:  document.text.replace(match, highlight)\n    })\n  }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndex, SearchIndexConfig } from \"modules\"\n\nimport { SearchMessage, SearchMessageType } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Search index\n */\nlet index: SearchIndex\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Setup multi-language support through `lunr-languages`\n *\n * @param config - Search index configuration\n */\nfunction setupLunrLanguages(config: SearchIndexConfig): void {\n  const base = \"../lunr\"\n\n  /* Add scripts for languages */\n  const scripts = []\n  for (const lang of config.lang) {\n    if (lang === \"ja\") scripts.push(`${base}/tinyseg.js`)\n    if (lang !== \"en\") scripts.push(`${base}/min/lunr.${lang}.min.js`)\n  }\n\n  /* Add multi-language support */\n  if (scripts.length > 1)\n    scripts.push(`${base}/min/lunr.multi.min.js`)\n\n  /* Load scripts synchronously */\n  if (scripts.length)\n    importScripts(\n      `${base}/min/lunr.stemmer.support.min.js`,\n      ...scripts\n    )\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Message handler\n *\n * @param message - Source message\n *\n * @return Target message\n */\nexport function handler(message: SearchMessage): SearchMessage {\n  switch (message.type) {\n\n    /* Setup search index */\n    case SearchMessageType.SETUP:\n      setupLunrLanguages(message.data.config)\n      index = new SearchIndex(message.data)\n      return {\n        type: SearchMessageType.DUMP,\n        data: index.toString()\n      }\n\n    /* Query search index */\n    case SearchMessageType.QUERY:\n      return {\n        type: SearchMessageType.RESULT,\n        data: index ? index.search(message.data) : []\n      }\n\n    /* All other messages */\n    default:\n      throw new TypeError(\"Invalid message type\")\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Worker\n * ------------------------------------------------------------------------- */\n\nself.addEventListener(\"message\", ev => {\n  self.postMessage(handler(ev.data))\n})\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/javascripts/worker/search.03c9bfda.min.js b/material/assets/javascripts/worker/search.ce66ce8d.min.js
similarity index 99%
rename from material/assets/javascripts/worker/search.03c9bfda.min.js
rename to material/assets/javascripts/worker/search.ce66ce8d.min.js
index 89a688eed..5d522609a 100644
--- a/material/assets/javascripts/worker/search.03c9bfda.min.js
+++ b/material/assets/javascripts/worker/search.ce66ce8d.min.js
@@ -56,4 +56,4 @@
  * lunr.Builder
  * Copyright (C) 2019 Oliver Nightingale
  */,R.Builder=function(){this._ref="id",this._fields=Object.create(null),this._documents=Object.create(null),this.invertedIndex=Object.create(null),this.fieldTermFrequencies={},this.fieldLengths={},this.tokenizer=R.tokenizer,this.pipeline=new R.Pipeline,this.searchPipeline=new R.Pipeline,this.documentCount=0,this._b=.75,this._k1=1.2,this.termIndex=0,this.metadataWhitelist=[]},R.Builder.prototype.ref=function(e){this._ref=e},R.Builder.prototype.field=function(e,t){if(/\//.test(e))throw new RangeError("Field '"+e+"' contains illegal character '/'");this._fields[e]=t||{}},R.Builder.prototype.b=function(e){this._b=e<0?0:e>1?1:e},R.Builder.prototype.k1=function(e){this._k1=e},R.Builder.prototype.add=function(e,t){var r=e[this._ref],n=Object.keys(this._fields);this._documents[r]=t||{},this.documentCount+=1;for(var i=0;i<n.length;i++){var s=n[i],o=this._fields[s].extractor,a=o?o(e):e[s],u=this.tokenizer(a,{fields:[s]}),l=this.pipeline.run(u),c=new R.FieldRef(r,s),h=Object.create(null);this.fieldTermFrequencies[c]=h,this.fieldLengths[c]=0,this.fieldLengths[c]+=l.length;for(var d=0;d<l.length;d++){var f=l[d];if(null==h[f]&&(h[f]=0),h[f]+=1,null==this.invertedIndex[f]){var p=Object.create(null);p._index=this.termIndex,this.termIndex+=1;for(var y=0;y<n.length;y++)p[n[y]]=Object.create(null);this.invertedIndex[f]=p}null==this.invertedIndex[f][s][r]&&(this.invertedIndex[f][s][r]=Object.create(null));for(var m=0;m<this.metadataWhitelist.length;m++){var g=this.metadataWhitelist[m],v=f.metadata[g];null==this.invertedIndex[f][s][r][g]&&(this.invertedIndex[f][s][r][g]=[]),this.invertedIndex[f][s][r][g].push(v)}}}},R.Builder.prototype.calculateAverageFieldLengths=function(){for(var e=Object.keys(this.fieldLengths),t=e.length,r={},n={},i=0;i<t;i++){var s=R.FieldRef.fromString(e[i]),o=s.fieldName;n[o]||(n[o]=0),n[o]+=1,r[o]||(r[o]=0),r[o]+=this.fieldLengths[s]}var a=Object.keys(this._fields);for(i=0;i<a.length;i++){var u=a[i];r[u]=r[u]/n[u]}this.averageFieldLength=r},R.Builder.prototype.createFieldVectors=function(){for(var e={},t=Object.keys(this.fieldTermFrequencies),r=t.length,n=Object.create(null),i=0;i<r;i++){for(var s=R.FieldRef.fromString(t[i]),o=s.fieldName,a=this.fieldLengths[s],u=new R.Vector,l=this.fieldTermFrequencies[s],c=Object.keys(l),h=c.length,d=this._fields[o].boost||1,f=this._documents[s.docRef].boost||1,p=0;p<h;p++){var y,m,g,v=c[p],x=l[v],w=this.invertedIndex[v]._index;void 0===n[v]?(y=R.idf(this.invertedIndex[v],this.documentCount),n[v]=y):y=n[v],m=y*((this._k1+1)*x)/(this._k1*(1-this._b+this._b*(a/this.averageFieldLength[o]))+x),m*=d,m*=f,g=Math.round(1e3*m)/1e3,u.insert(w,g)}e[s]=u}this.fieldVectors=e},R.Builder.prototype.createTokenSet=function(){this.tokenSet=R.TokenSet.fromArray(Object.keys(this.invertedIndex).sort())},R.Builder.prototype.build=function(){return this.calculateAverageFieldLengths(),this.createFieldVectors(),this.createTokenSet(),new R.Index({invertedIndex:this.invertedIndex,fieldVectors:this.fieldVectors,tokenSet:this.tokenSet,fields:Object.keys(this._fields),pipeline:this.searchPipeline})},R.Builder.prototype.use=function(e){var t=Array.prototype.slice.call(arguments,1);t.unshift(this),e.apply(this,t)},R.MatchData=function(e,t,r){for(var n=Object.create(null),i=Object.keys(r||{}),s=0;s<i.length;s++){var o=i[s];n[o]=r[o].slice()}this.metadata=Object.create(null),void 0!==e&&(this.metadata[e]=Object.create(null),this.metadata[e][t]=n)},R.MatchData.prototype.combine=function(e){for(var t=Object.keys(e.metadata),r=0;r<t.length;r++){var n=t[r],i=Object.keys(e.metadata[n]);null==this.metadata[n]&&(this.metadata[n]=Object.create(null));for(var s=0;s<i.length;s++){var o=i[s],a=Object.keys(e.metadata[n][o]);null==this.metadata[n][o]&&(this.metadata[n][o]=Object.create(null));for(var u=0;u<a.length;u++){var l=a[u];null==this.metadata[n][o][l]?this.metadata[n][o][l]=e.metadata[n][o][l]:this.metadata[n][o][l]=this.metadata[n][o][l].concat(e.metadata[n][o][l])}}}},R.MatchData.prototype.add=function(e,t,r){if(!(e in this.metadata))return this.metadata[e]=Object.create(null),void(this.metadata[e][t]=r);if(t in this.metadata[e])for(var n=Object.keys(r),i=0;i<n.length;i++){var s=n[i];s in this.metadata[e][t]?this.metadata[e][t][s]=this.metadata[e][t][s].concat(r[s]):this.metadata[e][t][s]=r[s]}else this.metadata[e][t]=r},R.Query=function(e){this.clauses=[],this.allFields=e},R.Query.wildcard=new String("*"),R.Query.wildcard.NONE=0,R.Query.wildcard.LEADING=1,R.Query.wildcard.TRAILING=2,R.Query.presence={OPTIONAL:1,REQUIRED:2,PROHIBITED:3},R.Query.prototype.clause=function(e){return"fields"in e||(e.fields=this.allFields),"boost"in e||(e.boost=1),"usePipeline"in e||(e.usePipeline=!0),"wildcard"in e||(e.wildcard=R.Query.wildcard.NONE),e.wildcard&R.Query.wildcard.LEADING&&e.term.charAt(0)!=R.Query.wildcard&&(e.term="*"+e.term),e.wildcard&R.Query.wildcard.TRAILING&&e.term.slice(-1)!=R.Query.wildcard&&(e.term=e.term+"*"),"presence"in e||(e.presence=R.Query.presence.OPTIONAL),this.clauses.push(e),this},R.Query.prototype.isNegated=function(){for(var e=0;e<this.clauses.length;e++)if(this.clauses[e].presence!=R.Query.presence.PROHIBITED)return!1;return!0},R.Query.prototype.term=function(e,t){if(Array.isArray(e))return e.forEach((function(e){this.term(e,R.utils.clone(t))}),this),this;var r=t||{};return r.term=e.toString(),this.clause(r),this},R.QueryParseError=function(e,t,r){this.name="QueryParseError",this.message=e,this.start=t,this.end=r},R.QueryParseError.prototype=new Error,R.QueryLexer=function(e){this.lexemes=[],this.str=e,this.length=e.length,this.pos=0,this.start=0,this.escapeCharPositions=[]},R.QueryLexer.prototype.run=function(){for(var e=R.QueryLexer.lexText;e;)e=e(this)},R.QueryLexer.prototype.sliceString=function(){for(var e=[],t=this.start,r=this.pos,n=0;n<this.escapeCharPositions.length;n++)r=this.escapeCharPositions[n],e.push(this.str.slice(t,r)),t=r+1;return e.push(this.str.slice(t,this.pos)),this.escapeCharPositions.length=0,e.join("")},R.QueryLexer.prototype.emit=function(e){this.lexemes.push({type:e,str:this.sliceString(),start:this.start,end:this.pos}),this.start=this.pos},R.QueryLexer.prototype.escapeCharacter=function(){this.escapeCharPositions.push(this.pos-1),this.pos+=1},R.QueryLexer.prototype.next=function(){if(this.pos>=this.length)return R.QueryLexer.EOS;var e=this.str.charAt(this.pos);return this.pos+=1,e},R.QueryLexer.prototype.width=function(){return this.pos-this.start},R.QueryLexer.prototype.ignore=function(){this.start==this.pos&&(this.pos+=1),this.start=this.pos},R.QueryLexer.prototype.backup=function(){this.pos-=1},R.QueryLexer.prototype.acceptDigitRun=function(){var e,t;do{t=(e=this.next()).charCodeAt(0)}while(t>47&&t<58);e!=R.QueryLexer.EOS&&this.backup()},R.QueryLexer.prototype.more=function(){return this.pos<this.length},R.QueryLexer.EOS="EOS",R.QueryLexer.FIELD="FIELD",R.QueryLexer.TERM="TERM",R.QueryLexer.EDIT_DISTANCE="EDIT_DISTANCE",R.QueryLexer.BOOST="BOOST",R.QueryLexer.PRESENCE="PRESENCE",R.QueryLexer.lexField=function(e){return e.backup(),e.emit(R.QueryLexer.FIELD),e.ignore(),R.QueryLexer.lexText},R.QueryLexer.lexTerm=function(e){if(e.width()>1&&(e.backup(),e.emit(R.QueryLexer.TERM)),e.ignore(),e.more())return R.QueryLexer.lexText},R.QueryLexer.lexEditDistance=function(e){return e.ignore(),e.acceptDigitRun(),e.emit(R.QueryLexer.EDIT_DISTANCE),R.QueryLexer.lexText},R.QueryLexer.lexBoost=function(e){return e.ignore(),e.acceptDigitRun(),e.emit(R.QueryLexer.BOOST),R.QueryLexer.lexText},R.QueryLexer.lexEOS=function(e){e.width()>0&&e.emit(R.QueryLexer.TERM)},R.QueryLexer.termSeparator=R.tokenizer.separator,R.QueryLexer.lexText=function(e){for(;;){var t=e.next();if(t==R.QueryLexer.EOS)return R.QueryLexer.lexEOS;if(92!=t.charCodeAt(0)){if(":"==t)return R.QueryLexer.lexField;if("~"==t)return e.backup(),e.width()>0&&e.emit(R.QueryLexer.TERM),R.QueryLexer.lexEditDistance;if("^"==t)return e.backup(),e.width()>0&&e.emit(R.QueryLexer.TERM),R.QueryLexer.lexBoost;if("+"==t&&1===e.width())return e.emit(R.QueryLexer.PRESENCE),R.QueryLexer.lexText;if("-"==t&&1===e.width())return e.emit(R.QueryLexer.PRESENCE),R.QueryLexer.lexText;if(t.match(R.QueryLexer.termSeparator))return R.QueryLexer.lexTerm}else e.escapeCharacter()}},R.QueryParser=function(e,t){this.lexer=new R.QueryLexer(e),this.query=t,this.currentClause={},this.lexemeIdx=0},R.QueryParser.prototype.parse=function(){this.lexer.run(),this.lexemes=this.lexer.lexemes;for(var e=R.QueryParser.parseClause;e;)e=e(this);return this.query},R.QueryParser.prototype.peekLexeme=function(){return this.lexemes[this.lexemeIdx]},R.QueryParser.prototype.consumeLexeme=function(){var e=this.peekLexeme();return this.lexemeIdx+=1,e},R.QueryParser.prototype.nextClause=function(){var e=this.currentClause;this.query.clause(e),this.currentClause={}},R.QueryParser.parseClause=function(e){var t=e.peekLexeme();if(null!=t)switch(t.type){case R.QueryLexer.PRESENCE:return R.QueryParser.parsePresence;case R.QueryLexer.FIELD:return R.QueryParser.parseField;case R.QueryLexer.TERM:return R.QueryParser.parseTerm;default:var r="expected either a field or a term, found "+t.type;throw t.str.length>=1&&(r+=" with value '"+t.str+"'"),new R.QueryParseError(r,t.start,t.end)}},R.QueryParser.parsePresence=function(e){var t=e.consumeLexeme();if(null!=t){switch(t.str){case"-":e.currentClause.presence=R.Query.presence.PROHIBITED;break;case"+":e.currentClause.presence=R.Query.presence.REQUIRED;break;default:var r="unrecognised presence operator'"+t.str+"'";throw new R.QueryParseError(r,t.start,t.end)}var n=e.peekLexeme();if(null==n){r="expecting term or field, found nothing";throw new R.QueryParseError(r,t.start,t.end)}switch(n.type){case R.QueryLexer.FIELD:return R.QueryParser.parseField;case R.QueryLexer.TERM:return R.QueryParser.parseTerm;default:r="expecting term or field, found '"+n.type+"'";throw new R.QueryParseError(r,n.start,n.end)}}},R.QueryParser.parseField=function(e){var t=e.consumeLexeme();if(null!=t){if(-1==e.query.allFields.indexOf(t.str)){var r=e.query.allFields.map((function(e){return"'"+e+"'"})).join(", "),n="unrecognised field '"+t.str+"', possible fields: "+r;throw new R.QueryParseError(n,t.start,t.end)}e.currentClause.fields=[t.str];var i=e.peekLexeme();if(null==i){n="expecting term, found nothing";throw new R.QueryParseError(n,t.start,t.end)}switch(i.type){case R.QueryLexer.TERM:return R.QueryParser.parseTerm;default:n="expecting term, found '"+i.type+"'";throw new R.QueryParseError(n,i.start,i.end)}}},R.QueryParser.parseTerm=function(e){var t=e.consumeLexeme();if(null!=t){e.currentClause.term=t.str.toLowerCase(),-1!=t.str.indexOf("*")&&(e.currentClause.usePipeline=!1);var r=e.peekLexeme();if(null!=r)switch(r.type){case R.QueryLexer.TERM:return e.nextClause(),R.QueryParser.parseTerm;case R.QueryLexer.FIELD:return e.nextClause(),R.QueryParser.parseField;case R.QueryLexer.EDIT_DISTANCE:return R.QueryParser.parseEditDistance;case R.QueryLexer.BOOST:return R.QueryParser.parseBoost;case R.QueryLexer.PRESENCE:return e.nextClause(),R.QueryParser.parsePresence;default:var n="Unexpected lexeme type '"+r.type+"'";throw new R.QueryParseError(n,r.start,r.end)}else e.nextClause()}},R.QueryParser.parseEditDistance=function(e){var t=e.consumeLexeme();if(null!=t){var 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5);\n","module.exports = global[\"lunr\"] = require(\"-!./lunr.js\");","/*!\n * escape-html\n * Copyright(c) 2012-2013 TJ Holowaychuk\n * Copyright(c) 2015 Andreas Lubbe\n * Copyright(c) 2015 Tiancheng \"Timothy\" Gu\n * MIT Licensed\n */\n\n'use strict';\n\n/**\n * Module variables.\n * @private\n */\n\nvar matchHtmlRegExp = /[\"'&<>]/;\n\n/**\n * Module exports.\n * @public\n */\n\nmodule.exports = escapeHtml;\n\n/**\n * Escape special characters in the given string of html.\n *\n * @param  {string} string The string to escape for inserting into HTML\n * @return {string}\n * @public\n */\n\nfunction escapeHtml(string) {\n  var str = '' + string;\n  var match = matchHtmlRegExp.exec(str);\n\n  if (!match) {\n    return str;\n  }\n\n  var escape;\n  var html = '';\n  var index = 0;\n  var lastIndex = 0;\n\n  for (index = match.index; index < str.length; index++) {\n    switch (str.charCodeAt(index)) {\n      case 34: // \"\n        escape = '&quot;';\n        break;\n      case 38: // 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(function (global) {\n  /* eslint-disable no-console */\n  return function (message) {\n    if (global.console && console.warn) {\n      console.warn(message)\n    }\n  }\n  /* eslint-enable no-console */\n})(this)\n\n/**\n * Convert an object to a string.\n *\n * In the case of `null` and `undefined` the function returns\n * the empty string, in all other cases the result of calling\n * `toString` on the passed object is returned.\n *\n * @param {Any} obj The object to convert to a string.\n * @return {String} string representation of the passed object.\n * @memberOf lunr.utils\n */\nlunr.utils.asString = function (obj) {\n  if (obj === void 0 || obj === null) {\n    return \"\"\n  } else {\n    return obj.toString()\n  }\n}\n\n/**\n * Clones an object.\n *\n * Will create a copy of an existing object such that any mutations\n * on the copy cannot affect the original.\n *\n * Only shallow objects are supported, passing a nested object to this\n * function will cause a TypeError.\n *\n * Objects with primitives, and arrays of primitives are supported.\n *\n * @param {Object} obj The object to clone.\n * @return {Object} a clone of the passed object.\n * @throws {TypeError} when a nested object is passed.\n * @memberOf Utils\n */\nlunr.utils.clone = function (obj) {\n  if (obj === null || obj === undefined) {\n    return obj\n  }\n\n  var clone = Object.create(null),\n      keys = Object.keys(obj)\n\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i],\n        val = obj[key]\n\n    if (Array.isArray(val)) {\n      clone[key] = val.slice()\n      continue\n    }\n\n    if (typeof val === 'string' ||\n        typeof val === 'number' ||\n        typeof val === 'boolean') {\n      clone[key] = val\n      continue\n    }\n\n    throw new TypeError(\"clone is not deep and does not support nested objects\")\n  }\n\n  return clone\n}\nlunr.FieldRef = function (docRef, fieldName, stringValue) {\n  this.docRef = docRef\n  this.fieldName = fieldName\n  this._stringValue = stringValue\n}\n\nlunr.FieldRef.joiner = \"/\"\n\nlunr.FieldRef.fromString = function (s) {\n  var n = s.indexOf(lunr.FieldRef.joiner)\n\n  if (n === -1) {\n    throw \"malformed field ref string\"\n  }\n\n  var fieldRef = s.slice(0, n),\n      docRef = s.slice(n + 1)\n\n  return new lunr.FieldRef (docRef, fieldRef, s)\n}\n\nlunr.FieldRef.prototype.toString = function () {\n  if (this._stringValue == undefined) {\n    this._stringValue = this.fieldName + lunr.FieldRef.joiner + this.docRef\n  }\n\n  return this._stringValue\n}\n/*!\n * lunr.Set\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A lunr set.\n *\n * @constructor\n */\nlunr.Set = function (elements) {\n  this.elements = Object.create(null)\n\n  if (elements) {\n    this.length = elements.length\n\n    for (var i = 0; i < this.length; i++) {\n      this.elements[elements[i]] = true\n    }\n  } else {\n    this.length = 0\n  }\n}\n\n/**\n * A complete set that contains all elements.\n *\n * @static\n * @readonly\n * @type {lunr.Set}\n */\nlunr.Set.complete = {\n  intersect: function (other) {\n    return other\n  },\n\n  union: function (other) {\n    return other\n  },\n\n  contains: function () {\n    return true\n  }\n}\n\n/**\n * An empty set that contains no elements.\n *\n * @static\n * @readonly\n * @type {lunr.Set}\n */\nlunr.Set.empty = {\n  intersect: function () {\n    return this\n  },\n\n  union: function (other) {\n    return other\n  },\n\n  contains: function () {\n    return false\n  }\n}\n\n/**\n * Returns true if this set contains the specified object.\n *\n * @param {object} object - Object whose presence in this set is to be tested.\n * @returns {boolean} - True if this set contains the specified object.\n */\nlunr.Set.prototype.contains = function (object) {\n  return !!this.elements[object]\n}\n\n/**\n * Returns a new set containing only the elements that are present in both\n * this set and the specified set.\n *\n * @param {lunr.Set} other - set to intersect with this set.\n * @returns {lunr.Set} a new set that is the intersection of this and the specified set.\n */\n\nlunr.Set.prototype.intersect = function (other) {\n  var a, b, elements, intersection = []\n\n  if (other === lunr.Set.complete) {\n    return this\n  }\n\n  if (other === lunr.Set.empty) {\n    return other\n  }\n\n  if (this.length < other.length) {\n    a = this\n    b = other\n  } else {\n    a = other\n    b = this\n  }\n\n  elements = Object.keys(a.elements)\n\n  for (var i = 0; i < elements.length; i++) {\n    var element = elements[i]\n    if (element in b.elements) {\n      intersection.push(element)\n    }\n  }\n\n  return new lunr.Set (intersection)\n}\n\n/**\n * Returns a new set combining the elements of this and the specified set.\n *\n * @param {lunr.Set} other - set to union with this set.\n * @return {lunr.Set} a new set that is the union of this and the specified set.\n */\n\nlunr.Set.prototype.union = function (other) {\n  if (other === lunr.Set.complete) {\n    return lunr.Set.complete\n  }\n\n  if (other === lunr.Set.empty) {\n    return this\n  }\n\n  return new lunr.Set(Object.keys(this.elements).concat(Object.keys(other.elements)))\n}\n/**\n * A function to calculate the inverse document frequency for\n * a posting. This is shared between the builder and the index\n *\n * @private\n * @param {object} posting - The posting for a given term\n * @param {number} documentCount - The total number of documents.\n */\nlunr.idf = function (posting, documentCount) {\n  var documentsWithTerm = 0\n\n  for (var fieldName in posting) {\n    if (fieldName == '_index') continue // Ignore the term index, its not a field\n    documentsWithTerm += Object.keys(posting[fieldName]).length\n  }\n\n  var x = (documentCount - documentsWithTerm + 0.5) / (documentsWithTerm + 0.5)\n\n  return Math.log(1 + Math.abs(x))\n}\n\n/**\n * A token wraps a string representation of a token\n * as it is passed through the text processing pipeline.\n *\n * @constructor\n * @param {string} [str=''] - The string token being wrapped.\n * @param {object} [metadata={}] - Metadata associated with this token.\n */\nlunr.Token = function (str, metadata) {\n  this.str = str || \"\"\n  this.metadata = metadata || {}\n}\n\n/**\n * Returns the token string that is being wrapped by this object.\n *\n * @returns {string}\n */\nlunr.Token.prototype.toString = function () {\n  return this.str\n}\n\n/**\n * A token update function is used when updating or optionally\n * when cloning a token.\n *\n * @callback lunr.Token~updateFunction\n * @param {string} str - The string representation of the token.\n * @param {Object} metadata - All metadata associated with this token.\n */\n\n/**\n * Applies the given function to the wrapped string token.\n *\n * @example\n * token.update(function (str, metadata) {\n *   return str.toUpperCase()\n * })\n *\n * @param {lunr.Token~updateFunction} fn - A function to apply to the token string.\n * @returns {lunr.Token}\n */\nlunr.Token.prototype.update = function (fn) {\n  this.str = fn(this.str, this.metadata)\n  return this\n}\n\n/**\n * Creates a clone of this token. Optionally a function can be\n * applied to the cloned token.\n *\n * @param {lunr.Token~updateFunction} [fn] - An optional function to apply to the cloned token.\n * @returns {lunr.Token}\n */\nlunr.Token.prototype.clone = function (fn) {\n  fn = fn || function (s) { return s }\n  return new lunr.Token (fn(this.str, this.metadata), this.metadata)\n}\n/*!\n * lunr.tokenizer\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A function for splitting a string into tokens ready to be inserted into\n * the search index. Uses `lunr.tokenizer.separator` to split strings, change\n * the value of this property to change how strings are split into tokens.\n *\n * This tokenizer will convert its parameter to a string by calling `toString` and\n * then will split this string on the character in `lunr.tokenizer.separator`.\n * Arrays will have their elements converted to strings and wrapped in a lunr.Token.\n *\n * Optional metadata can be passed to the tokenizer, this metadata will be cloned and\n * added as metadata to every token that is created from the object to be tokenized.\n *\n * @static\n * @param {?(string|object|object[])} obj - The object to convert into tokens\n * @param {?object} metadata - Optional metadata to associate with every token\n * @returns {lunr.Token[]}\n * @see {@link lunr.Pipeline}\n */\nlunr.tokenizer = function (obj, metadata) {\n  if (obj == null || obj == undefined) {\n    return []\n  }\n\n  if (Array.isArray(obj)) {\n    return obj.map(function (t) {\n      return new lunr.Token(\n        lunr.utils.asString(t).toLowerCase(),\n        lunr.utils.clone(metadata)\n      )\n    })\n  }\n\n  var str = obj.toString().toLowerCase(),\n      len = str.length,\n      tokens = []\n\n  for (var sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd++) {\n    var char = str.charAt(sliceEnd),\n        sliceLength = sliceEnd - sliceStart\n\n    if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) {\n\n      if (sliceLength > 0) {\n        var tokenMetadata = lunr.utils.clone(metadata) || {}\n        tokenMetadata[\"position\"] = [sliceStart, sliceLength]\n        tokenMetadata[\"index\"] = tokens.length\n\n        tokens.push(\n          new lunr.Token (\n            str.slice(sliceStart, sliceEnd),\n            tokenMetadata\n          )\n        )\n      }\n\n      sliceStart = sliceEnd + 1\n    }\n\n  }\n\n  return tokens\n}\n\n/**\n * The separator used to split a string into tokens. Override this property to change the behaviour of\n * `lunr.tokenizer` behaviour when tokenizing strings. By default this splits on whitespace and hyphens.\n *\n * @static\n * @see lunr.tokenizer\n */\nlunr.tokenizer.separator = /[\\s\\-]+/\n/*!\n * lunr.Pipeline\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.Pipelines maintain an ordered list of functions to be applied to all\n * tokens in documents entering the search index and queries being ran against\n * the index.\n *\n * An instance of lunr.Index created with the lunr shortcut will contain a\n * pipeline with a stop word filter and an English language stemmer. Extra\n * functions can be added before or after either of these functions or these\n * default functions can be removed.\n *\n * When run the pipeline will call each function in turn, passing a token, the\n * index of that token in the original list of all tokens and finally a list of\n * all the original tokens.\n *\n * The output of functions in the pipeline will be passed to the next function\n * in the pipeline. To exclude a token from entering the index the function\n * should return undefined, the rest of the pipeline will not be called with\n * this token.\n *\n * For serialisation of pipelines to work, all functions used in an instance of\n * a pipeline should be registered with lunr.Pipeline. Registered functions can\n * then be loaded. If trying to load a serialised pipeline that uses functions\n * that are not registered an error will be thrown.\n *\n * If not planning on serialising the pipeline then registering pipeline functions\n * is not necessary.\n *\n * @constructor\n */\nlunr.Pipeline = function () {\n  this._stack = []\n}\n\nlunr.Pipeline.registeredFunctions = Object.create(null)\n\n/**\n * A pipeline function maps lunr.Token to lunr.Token. A lunr.Token contains the token\n * string as well as all known metadata. A pipeline function can mutate the token string\n * or mutate (or add) metadata for a given token.\n *\n * A pipeline function can indicate that the passed token should be discarded by returning\n * null, undefined or an empty string. This token will not be passed to any downstream pipeline\n * functions and will not be added to the index.\n *\n * Multiple tokens can be returned by returning an array of tokens. Each token will be passed\n * to any downstream pipeline functions and all will returned tokens will be added to the index.\n *\n * Any number of pipeline functions may be chained together using a lunr.Pipeline.\n *\n * @interface lunr.PipelineFunction\n * @param {lunr.Token} token - A token from the document being processed.\n * @param {number} i - The index of this token in the complete list of tokens for this document/field.\n * @param {lunr.Token[]} tokens - All tokens for this document/field.\n * @returns {(?lunr.Token|lunr.Token[])}\n */\n\n/**\n * Register a function with the pipeline.\n *\n * Functions that are used in the pipeline should be registered if the pipeline\n * needs to be serialised, or a serialised pipeline needs to be loaded.\n *\n * Registering a function does not add it to a pipeline, functions must still be\n * added to instances of the pipeline for them to be used when running a pipeline.\n *\n * @param {lunr.PipelineFunction} fn - The function to check for.\n * @param {String} label - The label to register this function with\n */\nlunr.Pipeline.registerFunction = function (fn, label) {\n  if (label in this.registeredFunctions) {\n    lunr.utils.warn('Overwriting existing registered function: ' + label)\n  }\n\n  fn.label = label\n  lunr.Pipeline.registeredFunctions[fn.label] = fn\n}\n\n/**\n * Warns if the function is not registered as a Pipeline function.\n *\n * @param {lunr.PipelineFunction} fn - The function to check for.\n * @private\n */\nlunr.Pipeline.warnIfFunctionNotRegistered = function (fn) {\n  var isRegistered = fn.label && (fn.label in this.registeredFunctions)\n\n  if (!isRegistered) {\n    lunr.utils.warn('Function is not registered with pipeline. This may cause problems when serialising the index.\\n', fn)\n  }\n}\n\n/**\n * Loads a previously serialised pipeline.\n *\n * All functions to be loaded must already be registered with lunr.Pipeline.\n * If any function from the serialised data has not been registered then an\n * error will be thrown.\n *\n * @param {Object} serialised - The serialised pipeline to load.\n * @returns {lunr.Pipeline}\n */\nlunr.Pipeline.load = function (serialised) {\n  var pipeline = new lunr.Pipeline\n\n  serialised.forEach(function (fnName) {\n    var fn = lunr.Pipeline.registeredFunctions[fnName]\n\n    if (fn) {\n      pipeline.add(fn)\n    } else {\n      throw new Error('Cannot load unregistered function: ' + fnName)\n    }\n  })\n\n  return pipeline\n}\n\n/**\n * Adds new functions to the end of the pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction[]} functions - Any number of functions to add to the pipeline.\n */\nlunr.Pipeline.prototype.add = function () {\n  var fns = Array.prototype.slice.call(arguments)\n\n  fns.forEach(function (fn) {\n    lunr.Pipeline.warnIfFunctionNotRegistered(fn)\n    this._stack.push(fn)\n  }, this)\n}\n\n/**\n * Adds a single function after a function that already exists in the\n * pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.\n * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.\n */\nlunr.Pipeline.prototype.after = function (existingFn, newFn) {\n  lunr.Pipeline.warnIfFunctionNotRegistered(newFn)\n\n  var pos = this._stack.indexOf(existingFn)\n  if (pos == -1) {\n    throw new Error('Cannot find existingFn')\n  }\n\n  pos = pos + 1\n  this._stack.splice(pos, 0, newFn)\n}\n\n/**\n * Adds a single function before a function that already exists in the\n * pipeline.\n *\n * Logs a warning if the function has not been registered.\n *\n * @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.\n * @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.\n */\nlunr.Pipeline.prototype.before = function (existingFn, newFn) {\n  lunr.Pipeline.warnIfFunctionNotRegistered(newFn)\n\n  var pos = this._stack.indexOf(existingFn)\n  if (pos == -1) {\n    throw new Error('Cannot find existingFn')\n  }\n\n  this._stack.splice(pos, 0, newFn)\n}\n\n/**\n * Removes a function from the pipeline.\n *\n * @param {lunr.PipelineFunction} fn The function to remove from the pipeline.\n */\nlunr.Pipeline.prototype.remove = function (fn) {\n  var pos = this._stack.indexOf(fn)\n  if (pos == -1) {\n    return\n  }\n\n  this._stack.splice(pos, 1)\n}\n\n/**\n * Runs the current list of functions that make up the pipeline against the\n * passed tokens.\n *\n * @param {Array} tokens The tokens to run through the pipeline.\n * @returns {Array}\n */\nlunr.Pipeline.prototype.run = function (tokens) {\n  var stackLength = this._stack.length\n\n  for (var i = 0; i < stackLength; i++) {\n    var fn = this._stack[i]\n    var memo = []\n\n    for (var j = 0; j < tokens.length; j++) {\n      var result = fn(tokens[j], j, tokens)\n\n      if (result === null || result === void 0 || result === '') continue\n\n      if (Array.isArray(result)) {\n        for (var k = 0; k < result.length; k++) {\n          memo.push(result[k])\n        }\n      } else {\n        memo.push(result)\n      }\n    }\n\n    tokens = memo\n  }\n\n  return tokens\n}\n\n/**\n * Convenience method for passing a string through a pipeline and getting\n * strings out. This method takes care of wrapping the passed string in a\n * token and mapping the resulting tokens back to strings.\n *\n * @param {string} str - The string to pass through the pipeline.\n * @param {?object} metadata - Optional metadata to associate with the token\n * passed to the pipeline.\n * @returns {string[]}\n */\nlunr.Pipeline.prototype.runString = function (str, metadata) {\n  var token = new lunr.Token (str, metadata)\n\n  return this.run([token]).map(function (t) {\n    return t.toString()\n  })\n}\n\n/**\n * Resets the pipeline by removing any existing processors.\n *\n */\nlunr.Pipeline.prototype.reset = function () {\n  this._stack = []\n}\n\n/**\n * Returns a representation of the pipeline ready for serialisation.\n *\n * Logs a warning if the function has not been registered.\n *\n * @returns {Array}\n */\nlunr.Pipeline.prototype.toJSON = function () {\n  return this._stack.map(function (fn) {\n    lunr.Pipeline.warnIfFunctionNotRegistered(fn)\n\n    return fn.label\n  })\n}\n/*!\n * lunr.Vector\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A vector is used to construct the vector space of documents and queries. These\n * vectors support operations to determine the similarity between two documents or\n * a document and a query.\n *\n * Normally no parameters are required for initializing a vector, but in the case of\n * loading a previously dumped vector the raw elements can be provided to the constructor.\n *\n * For performance reasons vectors are implemented with a flat array, where an elements\n * index is immediately followed by its value. E.g. [index, value, index, value]. This\n * allows the underlying array to be as sparse as possible and still offer decent\n * performance when being used for vector calculations.\n *\n * @constructor\n * @param {Number[]} [elements] - The flat list of element index and element value pairs.\n */\nlunr.Vector = function (elements) {\n  this._magnitude = 0\n  this.elements = elements || []\n}\n\n\n/**\n * Calculates the position within the vector to insert a given index.\n *\n * This is used internally by insert and upsert. If there are duplicate indexes then\n * the position is returned as if the value for that index were to be updated, but it\n * is the callers responsibility to check whether there is a duplicate at that index\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @returns {Number}\n */\nlunr.Vector.prototype.positionForIndex = function (index) {\n  // For an empty vector the tuple can be inserted at the beginning\n  if (this.elements.length == 0) {\n    return 0\n  }\n\n  var start = 0,\n      end = this.elements.length / 2,\n      sliceLength = end - start,\n      pivotPoint = Math.floor(sliceLength / 2),\n      pivotIndex = this.elements[pivotPoint * 2]\n\n  while (sliceLength > 1) {\n    if (pivotIndex < index) {\n      start = pivotPoint\n    }\n\n    if (pivotIndex > index) {\n      end = pivotPoint\n    }\n\n    if (pivotIndex == index) {\n      break\n    }\n\n    sliceLength = end - start\n    pivotPoint = start + Math.floor(sliceLength / 2)\n    pivotIndex = this.elements[pivotPoint * 2]\n  }\n\n  if (pivotIndex == index) {\n    return pivotPoint * 2\n  }\n\n  if (pivotIndex > index) {\n    return pivotPoint * 2\n  }\n\n  if (pivotIndex < index) {\n    return (pivotPoint + 1) * 2\n  }\n}\n\n/**\n * Inserts an element at an index within the vector.\n *\n * Does not allow duplicates, will throw an error if there is already an entry\n * for this index.\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @param {Number} val - The value to be inserted into the vector.\n */\nlunr.Vector.prototype.insert = function (insertIdx, val) {\n  this.upsert(insertIdx, val, function () {\n    throw \"duplicate index\"\n  })\n}\n\n/**\n * Inserts or updates an existing index within the vector.\n *\n * @param {Number} insertIdx - The index at which the element should be inserted.\n * @param {Number} val - The value to be inserted into the vector.\n * @param {function} fn - A function that is called for updates, the existing value and the\n * requested value are passed as arguments\n */\nlunr.Vector.prototype.upsert = function (insertIdx, val, fn) {\n  this._magnitude = 0\n  var position = this.positionForIndex(insertIdx)\n\n  if (this.elements[position] == insertIdx) {\n    this.elements[position + 1] = fn(this.elements[position + 1], val)\n  } else {\n    this.elements.splice(position, 0, insertIdx, val)\n  }\n}\n\n/**\n * Calculates the magnitude of this vector.\n *\n * @returns {Number}\n */\nlunr.Vector.prototype.magnitude = function () {\n  if (this._magnitude) return this._magnitude\n\n  var sumOfSquares = 0,\n      elementsLength = this.elements.length\n\n  for (var i = 1; i < elementsLength; i += 2) {\n    var val = this.elements[i]\n    sumOfSquares += val * val\n  }\n\n  return this._magnitude = Math.sqrt(sumOfSquares)\n}\n\n/**\n * Calculates the dot product of this vector and another vector.\n *\n * @param {lunr.Vector} otherVector - The vector to compute the dot product with.\n * @returns {Number}\n */\nlunr.Vector.prototype.dot = function (otherVector) {\n  var dotProduct = 0,\n      a = this.elements, b = otherVector.elements,\n      aLen = a.length, bLen = b.length,\n      aVal = 0, bVal = 0,\n      i = 0, j = 0\n\n  while (i < aLen && j < bLen) {\n    aVal = a[i], bVal = b[j]\n    if (aVal < bVal) {\n      i += 2\n    } else if (aVal > bVal) {\n      j += 2\n    } else if (aVal == bVal) {\n      dotProduct += a[i + 1] * b[j + 1]\n      i += 2\n      j += 2\n    }\n  }\n\n  return dotProduct\n}\n\n/**\n * Calculates the similarity between this vector and another vector.\n *\n * @param {lunr.Vector} otherVector - The other vector to calculate the\n * similarity with.\n * @returns {Number}\n */\nlunr.Vector.prototype.similarity = function (otherVector) {\n  return this.dot(otherVector) / this.magnitude() || 0\n}\n\n/**\n * Converts the vector to an array of the elements within the vector.\n *\n * @returns {Number[]}\n */\nlunr.Vector.prototype.toArray = function () {\n  var output = new Array (this.elements.length / 2)\n\n  for (var i = 1, j = 0; i < this.elements.length; i += 2, j++) {\n    output[j] = this.elements[i]\n  }\n\n  return output\n}\n\n/**\n * A JSON serializable representation of the vector.\n *\n * @returns {Number[]}\n */\nlunr.Vector.prototype.toJSON = function () {\n  return this.elements\n}\n/* eslint-disable */\n/*!\n * lunr.stemmer\n * Copyright (C) 2019 Oliver Nightingale\n * Includes code from - http://tartarus.org/~martin/PorterStemmer/js.txt\n */\n\n/**\n * lunr.stemmer is an english language stemmer, this is a JavaScript\n * implementation of the PorterStemmer taken from http://tartarus.org/~martin\n *\n * @static\n * @implements {lunr.PipelineFunction}\n * @param {lunr.Token} token - The string to stem\n * @returns {lunr.Token}\n * @see {@link lunr.Pipeline}\n * @function\n */\nlunr.stemmer = (function(){\n  var step2list = {\n      \"ational\" : \"ate\",\n      \"tional\" : \"tion\",\n      \"enci\" : \"ence\",\n      \"anci\" : \"ance\",\n      \"izer\" : \"ize\",\n      \"bli\" : \"ble\",\n      \"alli\" : \"al\",\n      \"entli\" : \"ent\",\n      \"eli\" : \"e\",\n      \"ousli\" : \"ous\",\n      \"ization\" : \"ize\",\n      \"ation\" : \"ate\",\n      \"ator\" : \"ate\",\n      \"alism\" : \"al\",\n      \"iveness\" : \"ive\",\n      \"fulness\" : \"ful\",\n      \"ousness\" : \"ous\",\n      \"aliti\" : \"al\",\n      \"iviti\" : \"ive\",\n      \"biliti\" : \"ble\",\n      \"logi\" : \"log\"\n    },\n\n    step3list = {\n      \"icate\" : \"ic\",\n      \"ative\" : \"\",\n      \"alize\" : \"al\",\n      \"iciti\" : \"ic\",\n      \"ical\" : \"ic\",\n      \"ful\" : \"\",\n      \"ness\" : \"\"\n    },\n\n    c = \"[^aeiou]\",          // consonant\n    v = \"[aeiouy]\",          // vowel\n    C = c + \"[^aeiouy]*\",    // consonant sequence\n    V = v + \"[aeiou]*\",      // vowel sequence\n\n    mgr0 = \"^(\" + C + \")?\" + V + C,               // [C]VC... is m>0\n    meq1 = \"^(\" + C + \")?\" + V + C + \"(\" + V + \")?$\",  // [C]VC[V] is m=1\n    mgr1 = \"^(\" + C + \")?\" + V + C + V + C,       // [C]VCVC... is m>1\n    s_v = \"^(\" + C + \")?\" + v;                   // vowel in stem\n\n  var re_mgr0 = new RegExp(mgr0);\n  var re_mgr1 = new RegExp(mgr1);\n  var re_meq1 = new RegExp(meq1);\n  var re_s_v = new RegExp(s_v);\n\n  var re_1a = /^(.+?)(ss|i)es$/;\n  var re2_1a = /^(.+?)([^s])s$/;\n  var re_1b = /^(.+?)eed$/;\n  var re2_1b = /^(.+?)(ed|ing)$/;\n  var re_1b_2 = /.$/;\n  var re2_1b_2 = /(at|bl|iz)$/;\n  var re3_1b_2 = new RegExp(\"([^aeiouylsz])\\\\1$\");\n  var re4_1b_2 = new RegExp(\"^\" + C + v + \"[^aeiouwxy]$\");\n\n  var re_1c = /^(.+?[^aeiou])y$/;\n  var re_2 = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;\n\n  var re_3 = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;\n\n  var re_4 = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;\n  var re2_4 = /^(.+?)(s|t)(ion)$/;\n\n  var re_5 = /^(.+?)e$/;\n  var re_5_1 = /ll$/;\n  var re3_5 = new RegExp(\"^\" + C + v + \"[^aeiouwxy]$\");\n\n  var porterStemmer = function porterStemmer(w) {\n    var stem,\n      suffix,\n      firstch,\n      re,\n      re2,\n      re3,\n      re4;\n\n    if (w.length < 3) { return w; }\n\n    firstch = w.substr(0,1);\n    if (firstch == \"y\") {\n      w = firstch.toUpperCase() + w.substr(1);\n    }\n\n    // Step 1a\n    re = re_1a\n    re2 = re2_1a;\n\n    if (re.test(w)) { w = w.replace(re,\"$1$2\"); }\n    else if (re2.test(w)) { w = w.replace(re2,\"$1$2\"); }\n\n    // Step 1b\n    re = re_1b;\n    re2 = re2_1b;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      re = re_mgr0;\n      if (re.test(fp[1])) {\n        re = re_1b_2;\n        w = w.replace(re,\"\");\n      }\n    } else if (re2.test(w)) {\n      var fp = re2.exec(w);\n      stem = fp[1];\n      re2 = re_s_v;\n      if (re2.test(stem)) {\n        w = stem;\n        re2 = re2_1b_2;\n        re3 = re3_1b_2;\n        re4 = re4_1b_2;\n        if (re2.test(w)) { w = w + \"e\"; }\n        else if (re3.test(w)) { re = re_1b_2; w = w.replace(re,\"\"); }\n        else if (re4.test(w)) { w = w + \"e\"; }\n      }\n    }\n\n    // Step 1c - replace suffix y or Y by i if preceded by a non-vowel which is not the first letter of the word (so cry -> cri, by -> by, say -> say)\n    re = re_1c;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      w = stem + \"i\";\n    }\n\n    // Step 2\n    re = re_2;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      suffix = fp[2];\n      re = re_mgr0;\n      if (re.test(stem)) {\n        w = stem + step2list[suffix];\n      }\n    }\n\n    // Step 3\n    re = re_3;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      suffix = fp[2];\n      re = re_mgr0;\n      if (re.test(stem)) {\n        w = stem + step3list[suffix];\n      }\n    }\n\n    // Step 4\n    re = re_4;\n    re2 = re2_4;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      re = re_mgr1;\n      if (re.test(stem)) {\n        w = stem;\n      }\n    } else if (re2.test(w)) {\n      var fp = re2.exec(w);\n      stem = fp[1] + fp[2];\n      re2 = re_mgr1;\n      if (re2.test(stem)) {\n        w = stem;\n      }\n    }\n\n    // Step 5\n    re = re_5;\n    if (re.test(w)) {\n      var fp = re.exec(w);\n      stem = fp[1];\n      re = re_mgr1;\n      re2 = re_meq1;\n      re3 = re3_5;\n      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem)))) {\n        w = stem;\n      }\n    }\n\n    re = re_5_1;\n    re2 = re_mgr1;\n    if (re.test(w) && re2.test(w)) {\n      re = re_1b_2;\n      w = w.replace(re,\"\");\n    }\n\n    // and turn initial Y back to y\n\n    if (firstch == \"y\") {\n      w = firstch.toLowerCase() + w.substr(1);\n    }\n\n    return w;\n  };\n\n  return function (token) {\n    return token.update(porterStemmer);\n  }\n})();\n\nlunr.Pipeline.registerFunction(lunr.stemmer, 'stemmer')\n/*!\n * lunr.stopWordFilter\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.generateStopWordFilter builds a stopWordFilter function from the provided\n * list of stop words.\n *\n * The built in lunr.stopWordFilter is built using this generator and can be used\n * to generate custom stopWordFilters for applications or non English languages.\n *\n * @function\n * @param {Array} token The token to pass through the filter\n * @returns {lunr.PipelineFunction}\n * @see lunr.Pipeline\n * @see lunr.stopWordFilter\n */\nlunr.generateStopWordFilter = function (stopWords) {\n  var words = stopWords.reduce(function (memo, stopWord) {\n    memo[stopWord] = stopWord\n    return memo\n  }, {})\n\n  return function (token) {\n    if (token && words[token.toString()] !== token.toString()) return token\n  }\n}\n\n/**\n * lunr.stopWordFilter is an English language stop word list filter, any words\n * contained in the list will not be passed through the filter.\n *\n * This is intended to be used in the Pipeline. If the token does not pass the\n * filter then undefined will be returned.\n *\n * @function\n * @implements {lunr.PipelineFunction}\n * @params {lunr.Token} token - A token to check for being a stop word.\n * @returns {lunr.Token}\n * @see {@link lunr.Pipeline}\n */\nlunr.stopWordFilter = lunr.generateStopWordFilter([\n  'a',\n  'able',\n  'about',\n  'across',\n  'after',\n  'all',\n  'almost',\n  'also',\n  'am',\n  'among',\n  'an',\n  'and',\n  'any',\n  'are',\n  'as',\n  'at',\n  'be',\n  'because',\n  'been',\n  'but',\n  'by',\n  'can',\n  'cannot',\n  'could',\n  'dear',\n  'did',\n  'do',\n  'does',\n  'either',\n  'else',\n  'ever',\n  'every',\n  'for',\n  'from',\n  'get',\n  'got',\n  'had',\n  'has',\n  'have',\n  'he',\n  'her',\n  'hers',\n  'him',\n  'his',\n  'how',\n  'however',\n  'i',\n  'if',\n  'in',\n  'into',\n  'is',\n  'it',\n  'its',\n  'just',\n  'least',\n  'let',\n  'like',\n  'likely',\n  'may',\n  'me',\n  'might',\n  'most',\n  'must',\n  'my',\n  'neither',\n  'no',\n  'nor',\n  'not',\n  'of',\n  'off',\n  'often',\n  'on',\n  'only',\n  'or',\n  'other',\n  'our',\n  'own',\n  'rather',\n  'said',\n  'say',\n  'says',\n  'she',\n  'should',\n  'since',\n  'so',\n  'some',\n  'than',\n  'that',\n  'the',\n  'their',\n  'them',\n  'then',\n  'there',\n  'these',\n  'they',\n  'this',\n  'tis',\n  'to',\n  'too',\n  'twas',\n  'us',\n  'wants',\n  'was',\n  'we',\n  'were',\n  'what',\n  'when',\n  'where',\n  'which',\n  'while',\n  'who',\n  'whom',\n  'why',\n  'will',\n  'with',\n  'would',\n  'yet',\n  'you',\n  'your'\n])\n\nlunr.Pipeline.registerFunction(lunr.stopWordFilter, 'stopWordFilter')\n/*!\n * lunr.trimmer\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.trimmer is a pipeline function for trimming non word\n * characters from the beginning and end of tokens before they\n * enter the index.\n *\n * This implementation may not work correctly for non latin\n * characters and should either be removed or adapted for use\n * with languages with non-latin characters.\n *\n * @static\n * @implements {lunr.PipelineFunction}\n * @param {lunr.Token} token The token to pass through the filter\n * @returns {lunr.Token}\n * @see lunr.Pipeline\n */\nlunr.trimmer = function (token) {\n  return token.update(function (s) {\n    return s.replace(/^\\W+/, '').replace(/\\W+$/, '')\n  })\n}\n\nlunr.Pipeline.registerFunction(lunr.trimmer, 'trimmer')\n/*!\n * lunr.TokenSet\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * A token set is used to store the unique list of all tokens\n * within an index. Token sets are also used to represent an\n * incoming query to the index, this query token set and index\n * token set are then intersected to find which tokens to look\n * up in the inverted index.\n *\n * A token set can hold multiple tokens, as in the case of the\n * index token set, or it can hold a single token as in the\n * case of a simple query token set.\n *\n * Additionally token sets are used to perform wildcard matching.\n * Leading, contained and trailing wildcards are supported, and\n * from this edit distance matching can also be provided.\n *\n * Token sets are implemented as a minimal finite state automata,\n * where both common prefixes and suffixes are shared between tokens.\n * This helps to reduce the space used for storing the token set.\n *\n * @constructor\n */\nlunr.TokenSet = function () {\n  this.final = false\n  this.edges = {}\n  this.id = lunr.TokenSet._nextId\n  lunr.TokenSet._nextId += 1\n}\n\n/**\n * Keeps track of the next, auto increment, identifier to assign\n * to a new tokenSet.\n *\n * TokenSets require a unique identifier to be correctly minimised.\n *\n * @private\n */\nlunr.TokenSet._nextId = 1\n\n/**\n * Creates a TokenSet instance from the given sorted array of words.\n *\n * @param {String[]} arr - A sorted array of strings to create the set from.\n * @returns {lunr.TokenSet}\n * @throws Will throw an error if the input array is not sorted.\n */\nlunr.TokenSet.fromArray = function (arr) {\n  var builder = new lunr.TokenSet.Builder\n\n  for (var i = 0, len = arr.length; i < len; i++) {\n    builder.insert(arr[i])\n  }\n\n  builder.finish()\n  return builder.root\n}\n\n/**\n * Creates a token set from a query clause.\n *\n * @private\n * @param {Object} clause - A single clause from lunr.Query.\n * @param {string} clause.term - The query clause term.\n * @param {number} [clause.editDistance] - The optional edit distance for the term.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.fromClause = function (clause) {\n  if ('editDistance' in clause) {\n    return lunr.TokenSet.fromFuzzyString(clause.term, clause.editDistance)\n  } else {\n    return lunr.TokenSet.fromString(clause.term)\n  }\n}\n\n/**\n * Creates a token set representing a single string with a specified\n * edit distance.\n *\n * Insertions, deletions, substitutions and transpositions are each\n * treated as an edit distance of 1.\n *\n * Increasing the allowed edit distance will have a dramatic impact\n * on the performance of both creating and intersecting these TokenSets.\n * It is advised to keep the edit distance less than 3.\n *\n * @param {string} str - The string to create the token set from.\n * @param {number} editDistance - The allowed edit distance to match.\n * @returns {lunr.Vector}\n */\nlunr.TokenSet.fromFuzzyString = function (str, editDistance) {\n  var root = new lunr.TokenSet\n\n  var stack = [{\n    node: root,\n    editsRemaining: editDistance,\n    str: str\n  }]\n\n  while (stack.length) {\n    var frame = stack.pop()\n\n    // no edit\n    if (frame.str.length > 0) {\n      var char = frame.str.charAt(0),\n          noEditNode\n\n      if (char in frame.node.edges) {\n        noEditNode = frame.node.edges[char]\n      } else {\n        noEditNode = new lunr.TokenSet\n        frame.node.edges[char] = noEditNode\n      }\n\n      if (frame.str.length == 1) {\n        noEditNode.final = true\n      }\n\n      stack.push({\n        node: noEditNode,\n        editsRemaining: frame.editsRemaining,\n        str: frame.str.slice(1)\n      })\n    }\n\n    if (frame.editsRemaining == 0) {\n      continue\n    }\n\n    // insertion\n    if (\"*\" in frame.node.edges) {\n      var insertionNode = frame.node.edges[\"*\"]\n    } else {\n      var insertionNode = new lunr.TokenSet\n      frame.node.edges[\"*\"] = insertionNode\n    }\n\n    if (frame.str.length == 0) {\n      insertionNode.final = true\n    }\n\n    stack.push({\n      node: insertionNode,\n      editsRemaining: frame.editsRemaining - 1,\n      str: frame.str\n    })\n\n    // deletion\n    // can only do a deletion if we have enough edits remaining\n    // and if there are characters left to delete in the string\n    if (frame.str.length > 1) {\n      stack.push({\n        node: frame.node,\n        editsRemaining: frame.editsRemaining - 1,\n        str: frame.str.slice(1)\n      })\n    }\n\n    // deletion\n    // just removing the last character from the str\n    if (frame.str.length == 1) {\n      frame.node.final = true\n    }\n\n    // substitution\n    // can only do a substitution if we have enough edits remaining\n    // and if there are characters left to substitute\n    if (frame.str.length >= 1) {\n      if (\"*\" in frame.node.edges) {\n        var substitutionNode = frame.node.edges[\"*\"]\n      } else {\n        var substitutionNode = new lunr.TokenSet\n        frame.node.edges[\"*\"] = substitutionNode\n      }\n\n      if (frame.str.length == 1) {\n        substitutionNode.final = true\n      }\n\n      stack.push({\n        node: substitutionNode,\n        editsRemaining: frame.editsRemaining - 1,\n        str: frame.str.slice(1)\n      })\n    }\n\n    // transposition\n    // can only do a transposition if there are edits remaining\n    // and there are enough characters to transpose\n    if (frame.str.length > 1) {\n      var charA = frame.str.charAt(0),\n          charB = frame.str.charAt(1),\n          transposeNode\n\n      if (charB in frame.node.edges) {\n        transposeNode = frame.node.edges[charB]\n      } else {\n        transposeNode = new lunr.TokenSet\n        frame.node.edges[charB] = transposeNode\n      }\n\n      if (frame.str.length == 1) {\n        transposeNode.final = true\n      }\n\n      stack.push({\n        node: transposeNode,\n        editsRemaining: frame.editsRemaining - 1,\n        str: charA + frame.str.slice(2)\n      })\n    }\n  }\n\n  return root\n}\n\n/**\n * Creates a TokenSet from a string.\n *\n * The string may contain one or more wildcard characters (*)\n * that will allow wildcard matching when intersecting with\n * another TokenSet.\n *\n * @param {string} str - The string to create a TokenSet from.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.fromString = function (str) {\n  var node = new lunr.TokenSet,\n      root = node\n\n  /*\n   * Iterates through all characters within the passed string\n   * appending a node for each character.\n   *\n   * When a wildcard character is found then a self\n   * referencing edge is introduced to continually match\n   * any number of any characters.\n   */\n  for (var i = 0, len = str.length; i < len; i++) {\n    var char = str[i],\n        final = (i == len - 1)\n\n    if (char == \"*\") {\n      node.edges[char] = node\n      node.final = final\n\n    } else {\n      var next = new lunr.TokenSet\n      next.final = final\n\n      node.edges[char] = next\n      node = next\n    }\n  }\n\n  return root\n}\n\n/**\n * Converts this TokenSet into an array of strings\n * contained within the TokenSet.\n *\n * This is not intended to be used on a TokenSet that\n * contains wildcards, in these cases the results are\n * undefined and are likely to cause an infinite loop.\n *\n * @returns {string[]}\n */\nlunr.TokenSet.prototype.toArray = function () {\n  var words = []\n\n  var stack = [{\n    prefix: \"\",\n    node: this\n  }]\n\n  while (stack.length) {\n    var frame = stack.pop(),\n        edges = Object.keys(frame.node.edges),\n        len = edges.length\n\n    if (frame.node.final) {\n      /* In Safari, at this point the prefix is sometimes corrupted, see:\n       * https://github.com/olivernn/lunr.js/issues/279 Calling any\n       * String.prototype method forces Safari to \"cast\" this string to what\n       * it's supposed to be, fixing the bug. */\n      frame.prefix.charAt(0)\n      words.push(frame.prefix)\n    }\n\n    for (var i = 0; i < len; i++) {\n      var edge = edges[i]\n\n      stack.push({\n        prefix: frame.prefix.concat(edge),\n        node: frame.node.edges[edge]\n      })\n    }\n  }\n\n  return words\n}\n\n/**\n * Generates a string representation of a TokenSet.\n *\n * This is intended to allow TokenSets to be used as keys\n * in objects, largely to aid the construction and minimisation\n * of a TokenSet. As such it is not designed to be a human\n * friendly representation of the TokenSet.\n *\n * @returns {string}\n */\nlunr.TokenSet.prototype.toString = function () {\n  // NOTE: Using Object.keys here as this.edges is very likely\n  // to enter 'hash-mode' with many keys being added\n  //\n  // avoiding a for-in loop here as it leads to the function\n  // being de-optimised (at least in V8). From some simple\n  // benchmarks the performance is comparable, but allowing\n  // V8 to optimize may mean easy performance wins in the future.\n\n  if (this._str) {\n    return this._str\n  }\n\n  var str = this.final ? '1' : '0',\n      labels = Object.keys(this.edges).sort(),\n      len = labels.length\n\n  for (var i = 0; i < len; i++) {\n    var label = labels[i],\n        node = this.edges[label]\n\n    str = str + label + node.id\n  }\n\n  return str\n}\n\n/**\n * Returns a new TokenSet that is the intersection of\n * this TokenSet and the passed TokenSet.\n *\n * This intersection will take into account any wildcards\n * contained within the TokenSet.\n *\n * @param {lunr.TokenSet} b - An other TokenSet to intersect with.\n * @returns {lunr.TokenSet}\n */\nlunr.TokenSet.prototype.intersect = function (b) {\n  var output = new lunr.TokenSet,\n      frame = undefined\n\n  var stack = [{\n    qNode: b,\n    output: output,\n    node: this\n  }]\n\n  while (stack.length) {\n    frame = stack.pop()\n\n    // NOTE: As with the #toString method, we are using\n    // Object.keys and a for loop instead of a for-in loop\n    // as both of these objects enter 'hash' mode, causing\n    // the function to be de-optimised in V8\n    var qEdges = Object.keys(frame.qNode.edges),\n        qLen = qEdges.length,\n        nEdges = Object.keys(frame.node.edges),\n        nLen = nEdges.length\n\n    for (var q = 0; q < qLen; q++) {\n      var qEdge = qEdges[q]\n\n      for (var n = 0; n < nLen; n++) {\n        var nEdge = nEdges[n]\n\n        if (nEdge == qEdge || qEdge == '*') {\n          var node = frame.node.edges[nEdge],\n              qNode = frame.qNode.edges[qEdge],\n              final = node.final && qNode.final,\n              next = undefined\n\n          if (nEdge in frame.output.edges) {\n            // an edge already exists for this character\n            // no need to create a new node, just set the finality\n            // bit unless this node is already final\n            next = frame.output.edges[nEdge]\n            next.final = next.final || final\n\n          } else {\n            // no edge exists yet, must create one\n            // set the finality bit and insert it\n            // into the output\n            next = new lunr.TokenSet\n            next.final = final\n            frame.output.edges[nEdge] = next\n          }\n\n          stack.push({\n            qNode: qNode,\n            output: next,\n            node: node\n          })\n        }\n      }\n    }\n  }\n\n  return output\n}\nlunr.TokenSet.Builder = function () {\n  this.previousWord = \"\"\n  this.root = new lunr.TokenSet\n  this.uncheckedNodes = []\n  this.minimizedNodes = {}\n}\n\nlunr.TokenSet.Builder.prototype.insert = function (word) {\n  var node,\n      commonPrefix = 0\n\n  if (word < this.previousWord) {\n    throw new Error (\"Out of order word insertion\")\n  }\n\n  for (var i = 0; i < word.length && i < this.previousWord.length; i++) {\n    if (word[i] != this.previousWord[i]) break\n    commonPrefix++\n  }\n\n  this.minimize(commonPrefix)\n\n  if (this.uncheckedNodes.length == 0) {\n    node = this.root\n  } else {\n    node = this.uncheckedNodes[this.uncheckedNodes.length - 1].child\n  }\n\n  for (var i = commonPrefix; i < word.length; i++) {\n    var nextNode = new lunr.TokenSet,\n        char = word[i]\n\n    node.edges[char] = nextNode\n\n    this.uncheckedNodes.push({\n      parent: node,\n      char: char,\n      child: nextNode\n    })\n\n    node = nextNode\n  }\n\n  node.final = true\n  this.previousWord = word\n}\n\nlunr.TokenSet.Builder.prototype.finish = function () {\n  this.minimize(0)\n}\n\nlunr.TokenSet.Builder.prototype.minimize = function (downTo) {\n  for (var i = this.uncheckedNodes.length - 1; i >= downTo; i--) {\n    var node = this.uncheckedNodes[i],\n        childKey = node.child.toString()\n\n    if (childKey in this.minimizedNodes) {\n      node.parent.edges[node.char] = this.minimizedNodes[childKey]\n    } else {\n      // Cache the key for this node since\n      // we know it can't change anymore\n      node.child._str = childKey\n\n      this.minimizedNodes[childKey] = node.child\n    }\n\n    this.uncheckedNodes.pop()\n  }\n}\n/*!\n * lunr.Index\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * An index contains the built index of all documents and provides a query interface\n * to the index.\n *\n * Usually instances of lunr.Index will not be created using this constructor, instead\n * lunr.Builder should be used to construct new indexes, or lunr.Index.load should be\n * used to load previously built and serialized indexes.\n *\n * @constructor\n * @param {Object} attrs - The attributes of the built search index.\n * @param {Object} attrs.invertedIndex - An index of term/field to document reference.\n * @param {Object<string, lunr.Vector>} attrs.fieldVectors - Field vectors\n * @param {lunr.TokenSet} attrs.tokenSet - An set of all corpus tokens.\n * @param {string[]} attrs.fields - The names of indexed document fields.\n * @param {lunr.Pipeline} attrs.pipeline - The pipeline to use for search terms.\n */\nlunr.Index = function (attrs) {\n  this.invertedIndex = attrs.invertedIndex\n  this.fieldVectors = attrs.fieldVectors\n  this.tokenSet = attrs.tokenSet\n  this.fields = attrs.fields\n  this.pipeline = attrs.pipeline\n}\n\n/**\n * A result contains details of a document matching a search query.\n * @typedef {Object} lunr.Index~Result\n * @property {string} ref - The reference of the document this result represents.\n * @property {number} score - A number between 0 and 1 representing how similar this document is to the query.\n * @property {lunr.MatchData} matchData - Contains metadata about this match including which term(s) caused the match.\n */\n\n/**\n * Although lunr provides the ability to create queries using lunr.Query, it also provides a simple\n * query language which itself is parsed into an instance of lunr.Query.\n *\n * For programmatically building queries it is advised to directly use lunr.Query, the query language\n * is best used for human entered text rather than program generated text.\n *\n * At its simplest queries can just be a single term, e.g. `hello`, multiple terms are also supported\n * and will be combined with OR, e.g `hello world` will match documents that contain either 'hello'\n * or 'world', though those that contain both will rank higher in the results.\n *\n * Wildcards can be included in terms to match one or more unspecified characters, these wildcards can\n * be inserted anywhere within the term, and more than one wildcard can exist in a single term. Adding\n * wildcards will increase the number of documents that will be found but can also have a negative\n * impact on query performance, especially with wildcards at the beginning of a term.\n *\n * Terms can be restricted to specific fields, e.g. `title:hello`, only documents with the term\n * hello in the title field will match this query. Using a field not present in the index will lead\n * to an error being thrown.\n *\n * Modifiers can also be added to terms, lunr supports edit distance and boost modifiers on terms. A term\n * boost will make documents matching that term score higher, e.g. `foo^5`. Edit distance is also supported\n * to provide fuzzy matching, e.g. 'hello~2' will match documents with hello with an edit distance of 2.\n * Avoid large values for edit distance to improve query performance.\n *\n * Each term also supports a presence modifier. By default a term's presence in document is optional, however\n * this can be changed to either required or prohibited. For a term's presence to be required in a document the\n * term should be prefixed with a '+', e.g. `+foo bar` is a search for documents that must contain 'foo' and\n * optionally contain 'bar'. Conversely a leading '-' sets the terms presence to prohibited, i.e. it must not\n * appear in a document, e.g. `-foo bar` is a search for documents that do not contain 'foo' but may contain 'bar'.\n *\n * To escape special characters the backslash character '\\' can be used, this allows searches to include\n * characters that would normally be considered modifiers, e.g. `foo\\~2` will search for a term \"foo~2\" instead\n * of attempting to apply a boost of 2 to the search term \"foo\".\n *\n * @typedef {string} lunr.Index~QueryString\n * @example <caption>Simple single term query</caption>\n * hello\n * @example <caption>Multiple term query</caption>\n * hello world\n * @example <caption>term scoped to a field</caption>\n * title:hello\n * @example <caption>term with a boost of 10</caption>\n * hello^10\n * @example <caption>term with an edit distance of 2</caption>\n * hello~2\n * @example <caption>terms with presence modifiers</caption>\n * -foo +bar baz\n */\n\n/**\n * Performs a search against the index using lunr query syntax.\n *\n * Results will be returned sorted by their score, the most relevant results\n * will be returned first.  For details on how the score is calculated, please see\n * the {@link https://lunrjs.com/guides/searching.html#scoring|guide}.\n *\n * For more programmatic querying use lunr.Index#query.\n *\n * @param {lunr.Index~QueryString} queryString - A string containing a lunr query.\n * @throws {lunr.QueryParseError} If the passed query string cannot be parsed.\n * @returns {lunr.Index~Result[]}\n */\nlunr.Index.prototype.search = function (queryString) {\n  return this.query(function (query) {\n    var parser = new lunr.QueryParser(queryString, query)\n    parser.parse()\n  })\n}\n\n/**\n * A query builder callback provides a query object to be used to express\n * the query to perform on the index.\n *\n * @callback lunr.Index~queryBuilder\n * @param {lunr.Query} query - The query object to build up.\n * @this lunr.Query\n */\n\n/**\n * Performs a query against the index using the yielded lunr.Query object.\n *\n * If performing programmatic queries against the index, this method is preferred\n * over lunr.Index#search so as to avoid the additional query parsing overhead.\n *\n * A query object is yielded to the supplied function which should be used to\n * express the query to be run against the index.\n *\n * Note that although this function takes a callback parameter it is _not_ an\n * asynchronous operation, the callback is just yielded a query object to be\n * customized.\n *\n * @param {lunr.Index~queryBuilder} fn - A function that is used to build the query.\n * @returns {lunr.Index~Result[]}\n */\nlunr.Index.prototype.query = function (fn) {\n  // for each query clause\n  // * process terms\n  // * expand terms from token set\n  // * find matching documents and metadata\n  // * get document vectors\n  // * score documents\n\n  var query = new lunr.Query(this.fields),\n      matchingFields = Object.create(null),\n      queryVectors = Object.create(null),\n      termFieldCache = Object.create(null),\n      requiredMatches = Object.create(null),\n      prohibitedMatches = Object.create(null)\n\n  /*\n   * To support field level boosts a query vector is created per\n   * field. An empty vector is eagerly created to support negated\n   * queries.\n   */\n  for (var i = 0; i < this.fields.length; i++) {\n    queryVectors[this.fields[i]] = new lunr.Vector\n  }\n\n  fn.call(query, query)\n\n  for (var i = 0; i < query.clauses.length; i++) {\n    /*\n     * Unless the pipeline has been disabled for this term, which is\n     * the case for terms with wildcards, we need to pass the clause\n     * term through the search pipeline. A pipeline returns an array\n     * of processed terms. Pipeline functions may expand the passed\n     * term, which means we may end up performing multiple index lookups\n     * for a single query term.\n     */\n    var clause = query.clauses[i],\n        terms = null,\n        clauseMatches = lunr.Set.complete\n\n    if (clause.usePipeline) {\n      terms = this.pipeline.runString(clause.term, {\n        fields: clause.fields\n      })\n    } else {\n      terms = [clause.term]\n    }\n\n    for (var m = 0; m < terms.length; m++) {\n      var term = terms[m]\n\n      /*\n       * Each term returned from the pipeline needs to use the same query\n       * clause object, e.g. the same boost and or edit distance. The\n       * simplest way to do this is to re-use the clause object but mutate\n       * its term property.\n       */\n      clause.term = term\n\n      /*\n       * From the term in the clause we create a token set which will then\n       * be used to intersect the indexes token set to get a list of terms\n       * to lookup in the inverted index\n       */\n      var termTokenSet = lunr.TokenSet.fromClause(clause),\n          expandedTerms = this.tokenSet.intersect(termTokenSet).toArray()\n\n      /*\n       * If a term marked as required does not exist in the tokenSet it is\n       * impossible for the search to return any matches. We set all the field\n       * scoped required matches set to empty and stop examining any further\n       * clauses.\n       */\n      if (expandedTerms.length === 0 && clause.presence === lunr.Query.presence.REQUIRED) {\n        for (var k = 0; k < clause.fields.length; k++) {\n          var field = clause.fields[k]\n          requiredMatches[field] = lunr.Set.empty\n        }\n\n        break\n      }\n\n      for (var j = 0; j < expandedTerms.length; j++) {\n        /*\n         * For each term get the posting and termIndex, this is required for\n         * building the query vector.\n         */\n        var expandedTerm = expandedTerms[j],\n            posting = this.invertedIndex[expandedTerm],\n            termIndex = posting._index\n\n        for (var k = 0; k < clause.fields.length; k++) {\n          /*\n           * For each field that this query term is scoped by (by default\n           * all fields are in scope) we need to get all the document refs\n           * that have this term in that field.\n           *\n           * The posting is the entry in the invertedIndex for the matching\n           * term from above.\n           */\n          var field = clause.fields[k],\n              fieldPosting = posting[field],\n              matchingDocumentRefs = Object.keys(fieldPosting),\n              termField = expandedTerm + \"/\" + field,\n              matchingDocumentsSet = new lunr.Set(matchingDocumentRefs)\n\n          /*\n           * if the presence of this term is required ensure that the matching\n           * documents are added to the set of required matches for this clause.\n           *\n           */\n          if (clause.presence == lunr.Query.presence.REQUIRED) {\n            clauseMatches = clauseMatches.union(matchingDocumentsSet)\n\n            if (requiredMatches[field] === undefined) {\n              requiredMatches[field] = lunr.Set.complete\n            }\n          }\n\n          /*\n           * if the presence of this term is prohibited ensure that the matching\n           * documents are added to the set of prohibited matches for this field,\n           * creating that set if it does not yet exist.\n           */\n          if (clause.presence == lunr.Query.presence.PROHIBITED) {\n            if (prohibitedMatches[field] === undefined) {\n              prohibitedMatches[field] = lunr.Set.empty\n            }\n\n            prohibitedMatches[field] = prohibitedMatches[field].union(matchingDocumentsSet)\n\n            /*\n             * Prohibited matches should not be part of the query vector used for\n             * similarity scoring and no metadata should be extracted so we continue\n             * to the next field\n             */\n            continue\n          }\n\n          /*\n           * The query field vector is populated using the termIndex found for\n           * the term and a unit value with the appropriate boost applied.\n           * Using upsert because there could already be an entry in the vector\n           * for the term we are working with. In that case we just add the scores\n           * together.\n           */\n          queryVectors[field].upsert(termIndex, clause.boost, function (a, b) { return a + b })\n\n          /**\n           * If we've already seen this term, field combo then we've already collected\n           * the matching documents and metadata, no need to go through all that again\n           */\n          if (termFieldCache[termField]) {\n            continue\n          }\n\n          for (var l = 0; l < matchingDocumentRefs.length; l++) {\n            /*\n             * All metadata for this term/field/document triple\n             * are then extracted and collected into an instance\n             * of lunr.MatchData ready to be returned in the query\n             * results\n             */\n            var matchingDocumentRef = matchingDocumentRefs[l],\n                matchingFieldRef = new lunr.FieldRef (matchingDocumentRef, field),\n                metadata = fieldPosting[matchingDocumentRef],\n                fieldMatch\n\n            if ((fieldMatch = matchingFields[matchingFieldRef]) === undefined) {\n              matchingFields[matchingFieldRef] = new lunr.MatchData (expandedTerm, field, metadata)\n            } else {\n              fieldMatch.add(expandedTerm, field, metadata)\n            }\n\n          }\n\n          termFieldCache[termField] = true\n        }\n      }\n    }\n\n    /**\n     * If the presence was required we need to update the requiredMatches field sets.\n     * We do this after all fields for the term have collected their matches because\n     * the clause terms presence is required in _any_ of the fields not _all_ of the\n     * fields.\n     */\n    if (clause.presence === lunr.Query.presence.REQUIRED) {\n      for (var k = 0; k < clause.fields.length; k++) {\n        var field = clause.fields[k]\n        requiredMatches[field] = requiredMatches[field].intersect(clauseMatches)\n      }\n    }\n  }\n\n  /**\n   * Need to combine the field scoped required and prohibited\n   * matching documents into a global set of required and prohibited\n   * matches\n   */\n  var allRequiredMatches = lunr.Set.complete,\n      allProhibitedMatches = lunr.Set.empty\n\n  for (var i = 0; i < this.fields.length; i++) {\n    var field = this.fields[i]\n\n    if (requiredMatches[field]) {\n      allRequiredMatches = allRequiredMatches.intersect(requiredMatches[field])\n    }\n\n    if (prohibitedMatches[field]) {\n      allProhibitedMatches = allProhibitedMatches.union(prohibitedMatches[field])\n    }\n  }\n\n  var matchingFieldRefs = Object.keys(matchingFields),\n      results = [],\n      matches = Object.create(null)\n\n  /*\n   * If the query is negated (contains only prohibited terms)\n   * we need to get _all_ fieldRefs currently existing in the\n   * index. This is only done when we know that the query is\n   * entirely prohibited terms to avoid any cost of getting all\n   * fieldRefs unnecessarily.\n   *\n   * Additionally, blank MatchData must be created to correctly\n   * populate the results.\n   */\n  if (query.isNegated()) {\n    matchingFieldRefs = Object.keys(this.fieldVectors)\n\n    for (var i = 0; i < matchingFieldRefs.length; i++) {\n      var matchingFieldRef = matchingFieldRefs[i]\n      var fieldRef = lunr.FieldRef.fromString(matchingFieldRef)\n      matchingFields[matchingFieldRef] = new lunr.MatchData\n    }\n  }\n\n  for (var i = 0; i < matchingFieldRefs.length; i++) {\n    /*\n     * Currently we have document fields that match the query, but we\n     * need to return documents. The matchData and scores are combined\n     * from multiple fields belonging to the same document.\n     *\n     * Scores are calculated by field, using the query vectors created\n     * above, and combined into a final document score using addition.\n     */\n    var fieldRef = lunr.FieldRef.fromString(matchingFieldRefs[i]),\n        docRef = fieldRef.docRef\n\n    if (!allRequiredMatches.contains(docRef)) {\n      continue\n    }\n\n    if (allProhibitedMatches.contains(docRef)) {\n      continue\n    }\n\n    var fieldVector = this.fieldVectors[fieldRef],\n        score = queryVectors[fieldRef.fieldName].similarity(fieldVector),\n        docMatch\n\n    if ((docMatch = matches[docRef]) !== undefined) {\n      docMatch.score += score\n      docMatch.matchData.combine(matchingFields[fieldRef])\n    } else {\n      var match = {\n        ref: docRef,\n        score: score,\n        matchData: matchingFields[fieldRef]\n      }\n      matches[docRef] = match\n      results.push(match)\n    }\n  }\n\n  /*\n   * Sort the results objects by score, highest first.\n   */\n  return results.sort(function (a, b) {\n    return b.score - a.score\n  })\n}\n\n/**\n * Prepares the index for JSON serialization.\n *\n * The schema for this JSON blob will be described in a\n * separate JSON schema file.\n *\n * @returns {Object}\n */\nlunr.Index.prototype.toJSON = function () {\n  var invertedIndex = Object.keys(this.invertedIndex)\n    .sort()\n    .map(function (term) {\n      return [term, this.invertedIndex[term]]\n    }, this)\n\n  var fieldVectors = Object.keys(this.fieldVectors)\n    .map(function (ref) {\n      return [ref, this.fieldVectors[ref].toJSON()]\n    }, this)\n\n  return {\n    version: lunr.version,\n    fields: this.fields,\n    fieldVectors: fieldVectors,\n    invertedIndex: invertedIndex,\n    pipeline: this.pipeline.toJSON()\n  }\n}\n\n/**\n * Loads a previously serialized lunr.Index\n *\n * @param {Object} serializedIndex - A previously serialized lunr.Index\n * @returns {lunr.Index}\n */\nlunr.Index.load = function (serializedIndex) {\n  var attrs = {},\n      fieldVectors = {},\n      serializedVectors = serializedIndex.fieldVectors,\n      invertedIndex = Object.create(null),\n      serializedInvertedIndex = serializedIndex.invertedIndex,\n      tokenSetBuilder = new lunr.TokenSet.Builder,\n      pipeline = lunr.Pipeline.load(serializedIndex.pipeline)\n\n  if (serializedIndex.version != lunr.version) {\n    lunr.utils.warn(\"Version mismatch when loading serialised index. Current version of lunr '\" + lunr.version + \"' does not match serialized index '\" + serializedIndex.version + \"'\")\n  }\n\n  for (var i = 0; i < serializedVectors.length; i++) {\n    var tuple = serializedVectors[i],\n        ref = tuple[0],\n        elements = tuple[1]\n\n    fieldVectors[ref] = new lunr.Vector(elements)\n  }\n\n  for (var i = 0; i < serializedInvertedIndex.length; i++) {\n    var tuple = serializedInvertedIndex[i],\n        term = tuple[0],\n        posting = tuple[1]\n\n    tokenSetBuilder.insert(term)\n    invertedIndex[term] = posting\n  }\n\n  tokenSetBuilder.finish()\n\n  attrs.fields = serializedIndex.fields\n\n  attrs.fieldVectors = fieldVectors\n  attrs.invertedIndex = invertedIndex\n  attrs.tokenSet = tokenSetBuilder.root\n  attrs.pipeline = pipeline\n\n  return new lunr.Index(attrs)\n}\n/*!\n * lunr.Builder\n * Copyright (C) 2019 Oliver Nightingale\n */\n\n/**\n * lunr.Builder performs indexing on a set of documents and\n * returns instances of lunr.Index ready for querying.\n *\n * All configuration of the index is done via the builder, the\n * fields to index, the document reference, the text processing\n * pipeline and document scoring parameters are all set on the\n * builder before indexing.\n *\n * @constructor\n * @property {string} _ref - Internal reference to the document reference field.\n * @property {string[]} _fields - Internal reference to the document fields to index.\n * @property {object} invertedIndex - The inverted index maps terms to document fields.\n * @property {object} documentTermFrequencies - Keeps track of document term frequencies.\n * @property {object} documentLengths - Keeps track of the length of documents added to the index.\n * @property {lunr.tokenizer} tokenizer - Function for splitting strings into tokens for indexing.\n * @property {lunr.Pipeline} pipeline - The pipeline performs text processing on tokens before indexing.\n * @property {lunr.Pipeline} searchPipeline - A pipeline for processing search terms before querying the index.\n * @property {number} documentCount - Keeps track of the total number of documents indexed.\n * @property {number} _b - A parameter to control field length normalization, setting this to 0 disabled normalization, 1 fully normalizes field lengths, the default value is 0.75.\n * @property {number} _k1 - A parameter to control how quickly an increase in term frequency results in term frequency saturation, the default value is 1.2.\n * @property {number} termIndex - A counter incremented for each unique term, used to identify a terms position in the vector space.\n * @property {array} metadataWhitelist - A list of metadata keys that have been whitelisted for entry in the index.\n */\nlunr.Builder = function () {\n  this._ref = \"id\"\n  this._fields = Object.create(null)\n  this._documents = Object.create(null)\n  this.invertedIndex = Object.create(null)\n  this.fieldTermFrequencies = {}\n  this.fieldLengths = {}\n  this.tokenizer = lunr.tokenizer\n  this.pipeline = new lunr.Pipeline\n  this.searchPipeline = new lunr.Pipeline\n  this.documentCount = 0\n  this._b = 0.75\n  this._k1 = 1.2\n  this.termIndex = 0\n  this.metadataWhitelist = []\n}\n\n/**\n * Sets the document field used as the document reference. Every document must have this field.\n * The type of this field in the document should be a string, if it is not a string it will be\n * coerced into a string by calling toString.\n *\n * The default ref is 'id'.\n *\n * The ref should _not_ be changed during indexing, it should be set before any documents are\n * added to the index. Changing it during indexing can lead to inconsistent results.\n *\n * @param {string} ref - The name of the reference field in the document.\n */\nlunr.Builder.prototype.ref = function (ref) {\n  this._ref = ref\n}\n\n/**\n * A function that is used to extract a field from a document.\n *\n * Lunr expects a field to be at the top level of a document, if however the field\n * is deeply nested within a document an extractor function can be used to extract\n * the right field for indexing.\n *\n * @callback fieldExtractor\n * @param {object} doc - The document being added to the index.\n * @returns {?(string|object|object[])} obj - The object that will be indexed for this field.\n * @example <caption>Extracting a nested field</caption>\n * function (doc) { return doc.nested.field }\n */\n\n/**\n * Adds a field to the list of document fields that will be indexed. Every document being\n * indexed should have this field. Null values for this field in indexed documents will\n * not cause errors but will limit the chance of that document being retrieved by searches.\n *\n * All fields should be added before adding documents to the index. Adding fields after\n * a document has been indexed will have no effect on already indexed documents.\n *\n * Fields can be boosted at build time. This allows terms within that field to have more\n * importance when ranking search results. Use a field boost to specify that matches within\n * one field are more important than other fields.\n *\n * @param {string} fieldName - The name of a field to index in all documents.\n * @param {object} attributes - Optional attributes associated with this field.\n * @param {number} [attributes.boost=1] - Boost applied to all terms within this field.\n * @param {fieldExtractor} [attributes.extractor] - Function to extract a field from a document.\n * @throws {RangeError} fieldName cannot contain unsupported characters '/'\n */\nlunr.Builder.prototype.field = function (fieldName, attributes) {\n  if (/\\//.test(fieldName)) {\n    throw new RangeError (\"Field '\" + fieldName + \"' contains illegal character '/'\")\n  }\n\n  this._fields[fieldName] = attributes || {}\n}\n\n/**\n * A parameter to tune the amount of field length normalisation that is applied when\n * calculating relevance scores. A value of 0 will completely disable any normalisation\n * and a value of 1 will fully normalise field lengths. The default is 0.75. Values of b\n * will be clamped to the range 0 - 1.\n *\n * @param {number} number - The value to set for this tuning parameter.\n */\nlunr.Builder.prototype.b = function (number) {\n  if (number < 0) {\n    this._b = 0\n  } else if (number > 1) {\n    this._b = 1\n  } else {\n    this._b = number\n  }\n}\n\n/**\n * A parameter that controls the speed at which a rise in term frequency results in term\n * frequency saturation. The default value is 1.2. Setting this to a higher value will give\n * slower saturation levels, a lower value will result in quicker saturation.\n *\n * @param {number} number - The value to set for this tuning parameter.\n */\nlunr.Builder.prototype.k1 = function (number) {\n  this._k1 = number\n}\n\n/**\n * Adds a document to the index.\n *\n * Before adding fields to the index the index should have been fully setup, with the document\n * ref and all fields to index already having been specified.\n *\n * The document must have a field name as specified by the ref (by default this is 'id') and\n * it should have all fields defined for indexing, though null or undefined values will not\n * cause errors.\n *\n * Entire documents can be boosted at build time. Applying a boost to a document indicates that\n * this document should rank higher in search results than other documents.\n *\n * @param {object} doc - The document to add to the index.\n * @param {object} attributes - Optional attributes associated with this document.\n * @param {number} [attributes.boost=1] - Boost applied to all terms within this document.\n */\nlunr.Builder.prototype.add = function (doc, attributes) {\n  var docRef = doc[this._ref],\n      fields = Object.keys(this._fields)\n\n  this._documents[docRef] = attributes || {}\n  this.documentCount += 1\n\n  for (var i = 0; i < fields.length; i++) {\n    var fieldName = fields[i],\n        extractor = this._fields[fieldName].extractor,\n        field = extractor ? extractor(doc) : doc[fieldName],\n        tokens = this.tokenizer(field, {\n          fields: [fieldName]\n        }),\n        terms = this.pipeline.run(tokens),\n        fieldRef = new lunr.FieldRef (docRef, fieldName),\n        fieldTerms = Object.create(null)\n\n    this.fieldTermFrequencies[fieldRef] = fieldTerms\n    this.fieldLengths[fieldRef] = 0\n\n    // store the length of this field for this document\n    this.fieldLengths[fieldRef] += terms.length\n\n    // calculate term frequencies for this field\n    for (var j = 0; j < terms.length; j++) {\n      var term = terms[j]\n\n      if (fieldTerms[term] == undefined) {\n        fieldTerms[term] = 0\n      }\n\n      fieldTerms[term] += 1\n\n      // add to inverted index\n      // create an initial posting if one doesn't exist\n      if (this.invertedIndex[term] == undefined) {\n        var posting = Object.create(null)\n        posting[\"_index\"] = this.termIndex\n        this.termIndex += 1\n\n        for (var k = 0; k < fields.length; k++) {\n          posting[fields[k]] = Object.create(null)\n        }\n\n        this.invertedIndex[term] = posting\n      }\n\n      // add an entry for this term/fieldName/docRef to the invertedIndex\n      if (this.invertedIndex[term][fieldName][docRef] == undefined) {\n        this.invertedIndex[term][fieldName][docRef] = Object.create(null)\n      }\n\n      // store all whitelisted metadata about this token in the\n      // inverted index\n      for (var l = 0; l < this.metadataWhitelist.length; l++) {\n        var metadataKey = this.metadataWhitelist[l],\n            metadata = term.metadata[metadataKey]\n\n        if (this.invertedIndex[term][fieldName][docRef][metadataKey] == undefined) {\n          this.invertedIndex[term][fieldName][docRef][metadataKey] = []\n        }\n\n        this.invertedIndex[term][fieldName][docRef][metadataKey].push(metadata)\n      }\n    }\n\n  }\n}\n\n/**\n * Calculates the average document length for this index\n *\n * @private\n */\nlunr.Builder.prototype.calculateAverageFieldLengths = function () {\n\n  var fieldRefs = Object.keys(this.fieldLengths),\n      numberOfFields = fieldRefs.length,\n      accumulator = {},\n      documentsWithField = {}\n\n  for (var i = 0; i < numberOfFields; i++) {\n    var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]),\n        field = fieldRef.fieldName\n\n    documentsWithField[field] || (documentsWithField[field] = 0)\n    documentsWithField[field] += 1\n\n    accumulator[field] || (accumulator[field] = 0)\n    accumulator[field] += this.fieldLengths[fieldRef]\n  }\n\n  var fields = Object.keys(this._fields)\n\n  for (var i = 0; i < fields.length; i++) {\n    var fieldName = fields[i]\n    accumulator[fieldName] = accumulator[fieldName] / documentsWithField[fieldName]\n  }\n\n  this.averageFieldLength = accumulator\n}\n\n/**\n * Builds a vector space model of every document using lunr.Vector\n *\n * @private\n */\nlunr.Builder.prototype.createFieldVectors = function () {\n  var fieldVectors = {},\n      fieldRefs = Object.keys(this.fieldTermFrequencies),\n      fieldRefsLength = fieldRefs.length,\n      termIdfCache = Object.create(null)\n\n  for (var i = 0; i < fieldRefsLength; i++) {\n    var fieldRef = lunr.FieldRef.fromString(fieldRefs[i]),\n        fieldName = fieldRef.fieldName,\n        fieldLength = this.fieldLengths[fieldRef],\n        fieldVector = new lunr.Vector,\n        termFrequencies = this.fieldTermFrequencies[fieldRef],\n        terms = Object.keys(termFrequencies),\n        termsLength = terms.length\n\n\n    var fieldBoost = this._fields[fieldName].boost || 1,\n        docBoost = this._documents[fieldRef.docRef].boost || 1\n\n    for (var j = 0; j < termsLength; j++) {\n      var term = terms[j],\n          tf = termFrequencies[term],\n          termIndex = this.invertedIndex[term]._index,\n          idf, score, scoreWithPrecision\n\n      if (termIdfCache[term] === undefined) {\n        idf = lunr.idf(this.invertedIndex[term], this.documentCount)\n        termIdfCache[term] = idf\n      } else {\n        idf = termIdfCache[term]\n      }\n\n      score = idf * ((this._k1 + 1) * tf) / (this._k1 * (1 - this._b + this._b * (fieldLength / this.averageFieldLength[fieldName])) + tf)\n      score *= fieldBoost\n      score *= docBoost\n      scoreWithPrecision = Math.round(score * 1000) / 1000\n      // Converts 1.23456789 to 1.234.\n      // Reducing the precision so that the vectors take up less\n      // space when serialised. Doing it now so that they behave\n      // the same before and after serialisation. Also, this is\n      // the fastest approach to reducing a number's precision in\n      // JavaScript.\n\n      fieldVector.insert(termIndex, scoreWithPrecision)\n    }\n\n    fieldVectors[fieldRef] = fieldVector\n  }\n\n  this.fieldVectors = fieldVectors\n}\n\n/**\n * Creates a token set of all tokens in the index using lunr.TokenSet\n *\n * @private\n */\nlunr.Builder.prototype.createTokenSet = function () {\n  this.tokenSet = lunr.TokenSet.fromArray(\n    Object.keys(this.invertedIndex).sort()\n  )\n}\n\n/**\n * Builds the index, creating an instance of lunr.Index.\n *\n * This completes the indexing process and should only be called\n * once all documents have been added to the index.\n *\n * @returns {lunr.Index}\n */\nlunr.Builder.prototype.build = function () {\n  this.calculateAverageFieldLengths()\n  this.createFieldVectors()\n  this.createTokenSet()\n\n  return new lunr.Index({\n    invertedIndex: this.invertedIndex,\n    fieldVectors: this.fieldVectors,\n    tokenSet: this.tokenSet,\n    fields: Object.keys(this._fields),\n    pipeline: this.searchPipeline\n  })\n}\n\n/**\n * Applies a plugin to the index builder.\n *\n * A plugin is a function that is called with the index builder as its context.\n * Plugins can be used to customise or extend the behaviour of the index\n * in some way. A plugin is just a function, that encapsulated the custom\n * behaviour that should be applied when building the index.\n *\n * The plugin function will be called with the index builder as its argument, additional\n * arguments can also be passed when calling use. The function will be called\n * with the index builder as its context.\n *\n * @param {Function} plugin The plugin to apply.\n */\nlunr.Builder.prototype.use = function (fn) {\n  var args = Array.prototype.slice.call(arguments, 1)\n  args.unshift(this)\n  fn.apply(this, args)\n}\n/**\n * Contains and collects metadata about a matching document.\n * A single instance of lunr.MatchData is returned as part of every\n * lunr.Index~Result.\n *\n * @constructor\n * @param {string} term - The term this match data is associated with\n * @param {string} field - The field in which the term was found\n * @param {object} metadata - The metadata recorded about this term in this field\n * @property {object} metadata - A cloned collection of metadata associated with this document.\n * @see {@link lunr.Index~Result}\n */\nlunr.MatchData = function (term, field, metadata) {\n  var clonedMetadata = Object.create(null),\n      metadataKeys = Object.keys(metadata || {})\n\n  // Cloning the metadata to prevent the original\n  // being mutated during match data combination.\n  // Metadata is kept in an array within the inverted\n  // index so cloning the data can be done with\n  // Array#slice\n  for (var i = 0; i < metadataKeys.length; i++) {\n    var key = metadataKeys[i]\n    clonedMetadata[key] = metadata[key].slice()\n  }\n\n  this.metadata = Object.create(null)\n\n  if (term !== undefined) {\n    this.metadata[term] = Object.create(null)\n    this.metadata[term][field] = clonedMetadata\n  }\n}\n\n/**\n * An instance of lunr.MatchData will be created for every term that matches a\n * document. However only one instance is required in a lunr.Index~Result. This\n * method combines metadata from another instance of lunr.MatchData with this\n * objects metadata.\n *\n * @param {lunr.MatchData} otherMatchData - Another instance of match data to merge with this one.\n * @see {@link lunr.Index~Result}\n */\nlunr.MatchData.prototype.combine = function (otherMatchData) {\n  var terms = Object.keys(otherMatchData.metadata)\n\n  for (var i = 0; i < terms.length; i++) {\n    var term = terms[i],\n        fields = Object.keys(otherMatchData.metadata[term])\n\n    if (this.metadata[term] == undefined) {\n      this.metadata[term] = Object.create(null)\n    }\n\n    for (var j = 0; j < fields.length; j++) {\n      var field = fields[j],\n          keys = Object.keys(otherMatchData.metadata[term][field])\n\n      if (this.metadata[term][field] == undefined) {\n        this.metadata[term][field] = Object.create(null)\n      }\n\n      for (var k = 0; k < keys.length; k++) {\n        var key = keys[k]\n\n        if (this.metadata[term][field][key] == undefined) {\n          this.metadata[term][field][key] = otherMatchData.metadata[term][field][key]\n        } else {\n          this.metadata[term][field][key] = this.metadata[term][field][key].concat(otherMatchData.metadata[term][field][key])\n        }\n\n      }\n    }\n  }\n}\n\n/**\n * Add metadata for a term/field pair to this instance of match data.\n *\n * @param {string} term - The term this match data is associated with\n * @param {string} field - The field in which the term was found\n * @param {object} metadata - The metadata recorded about this term in this field\n */\nlunr.MatchData.prototype.add = function (term, field, metadata) {\n  if (!(term in this.metadata)) {\n    this.metadata[term] = Object.create(null)\n    this.metadata[term][field] = metadata\n    return\n  }\n\n  if (!(field in this.metadata[term])) {\n    this.metadata[term][field] = metadata\n    return\n  }\n\n  var metadataKeys = Object.keys(metadata)\n\n  for (var i = 0; i < metadataKeys.length; i++) {\n    var key = metadataKeys[i]\n\n    if (key in this.metadata[term][field]) {\n      this.metadata[term][field][key] = this.metadata[term][field][key].concat(metadata[key])\n    } else {\n      this.metadata[term][field][key] = metadata[key]\n    }\n  }\n}\n/**\n * A lunr.Query provides a programmatic way of defining queries to be performed\n * against a {@link lunr.Index}.\n *\n * Prefer constructing a lunr.Query using the {@link lunr.Index#query} method\n * so the query object is pre-initialized with the right index fields.\n *\n * @constructor\n * @property {lunr.Query~Clause[]} clauses - An array of query clauses.\n * @property {string[]} allFields - An array of all available fields in a lunr.Index.\n */\nlunr.Query = function (allFields) {\n  this.clauses = []\n  this.allFields = allFields\n}\n\n/**\n * Constants for indicating what kind of automatic wildcard insertion will be used when constructing a query clause.\n *\n * This allows wildcards to be added to the beginning and end of a term without having to manually do any string\n * concatenation.\n *\n * The wildcard constants can be bitwise combined to select both leading and trailing wildcards.\n *\n * @constant\n * @default\n * @property {number} wildcard.NONE - The term will have no wildcards inserted, this is the default behaviour\n * @property {number} wildcard.LEADING - Prepend the term with a wildcard, unless a leading wildcard already exists\n * @property {number} wildcard.TRAILING - Append a wildcard to the term, unless a trailing wildcard already exists\n * @see lunr.Query~Clause\n * @see lunr.Query#clause\n * @see lunr.Query#term\n * @example <caption>query term with trailing wildcard</caption>\n * query.term('foo', { wildcard: lunr.Query.wildcard.TRAILING })\n * @example <caption>query term with leading and trailing wildcard</caption>\n * query.term('foo', {\n *   wildcard: lunr.Query.wildcard.LEADING | lunr.Query.wildcard.TRAILING\n * })\n */\n\nlunr.Query.wildcard = new String (\"*\")\nlunr.Query.wildcard.NONE = 0\nlunr.Query.wildcard.LEADING = 1\nlunr.Query.wildcard.TRAILING = 2\n\n/**\n * Constants for indicating what kind of presence a term must have in matching documents.\n *\n * @constant\n * @enum {number}\n * @see lunr.Query~Clause\n * @see lunr.Query#clause\n * @see lunr.Query#term\n * @example <caption>query term with required presence</caption>\n * query.term('foo', { presence: lunr.Query.presence.REQUIRED })\n */\nlunr.Query.presence = {\n  /**\n   * Term's presence in a document is optional, this is the default value.\n   */\n  OPTIONAL: 1,\n\n  /**\n   * Term's presence in a document is required, documents that do not contain\n   * this term will not be returned.\n   */\n  REQUIRED: 2,\n\n  /**\n   * Term's presence in a document is prohibited, documents that do contain\n   * this term will not be returned.\n   */\n  PROHIBITED: 3\n}\n\n/**\n * A single clause in a {@link lunr.Query} contains a term and details on how to\n * match that term against a {@link lunr.Index}.\n *\n * @typedef {Object} lunr.Query~Clause\n * @property {string[]} fields - The fields in an index this clause should be matched against.\n * @property {number} [boost=1] - Any boost that should be applied when matching this clause.\n * @property {number} [editDistance] - Whether the term should have fuzzy matching applied, and how fuzzy the match should be.\n * @property {boolean} [usePipeline] - Whether the term should be passed through the search pipeline.\n * @property {number} [wildcard=lunr.Query.wildcard.NONE] - Whether the term should have wildcards appended or prepended.\n * @property {number} [presence=lunr.Query.presence.OPTIONAL] - The terms presence in any matching documents.\n */\n\n/**\n * Adds a {@link lunr.Query~Clause} to this query.\n *\n * Unless the clause contains the fields to be matched all fields will be matched. In addition\n * a default boost of 1 is applied to the clause.\n *\n * @param {lunr.Query~Clause} clause - The clause to add to this query.\n * @see lunr.Query~Clause\n * @returns {lunr.Query}\n */\nlunr.Query.prototype.clause = function (clause) {\n  if (!('fields' in clause)) {\n    clause.fields = this.allFields\n  }\n\n  if (!('boost' in clause)) {\n    clause.boost = 1\n  }\n\n  if (!('usePipeline' in clause)) {\n    clause.usePipeline = true\n  }\n\n  if (!('wildcard' in clause)) {\n    clause.wildcard = lunr.Query.wildcard.NONE\n  }\n\n  if ((clause.wildcard & lunr.Query.wildcard.LEADING) && (clause.term.charAt(0) != lunr.Query.wildcard)) {\n    clause.term = \"*\" + clause.term\n  }\n\n  if ((clause.wildcard & lunr.Query.wildcard.TRAILING) && (clause.term.slice(-1) != lunr.Query.wildcard)) {\n    clause.term = \"\" + clause.term + \"*\"\n  }\n\n  if (!('presence' in clause)) {\n    clause.presence = lunr.Query.presence.OPTIONAL\n  }\n\n  this.clauses.push(clause)\n\n  return this\n}\n\n/**\n * A negated query is one in which every clause has a presence of\n * prohibited. These queries require some special processing to return\n * the expected results.\n *\n * @returns boolean\n */\nlunr.Query.prototype.isNegated = function () {\n  for (var i = 0; i < this.clauses.length; i++) {\n    if (this.clauses[i].presence != lunr.Query.presence.PROHIBITED) {\n      return false\n    }\n  }\n\n  return true\n}\n\n/**\n * Adds a term to the current query, under the covers this will create a {@link lunr.Query~Clause}\n * to the list of clauses that make up this query.\n *\n * The term is used as is, i.e. no tokenization will be performed by this method. Instead conversion\n * to a token or token-like string should be done before calling this method.\n *\n * The term will be converted to a string by calling `toString`. Multiple terms can be passed as an\n * array, each term in the array will share the same options.\n *\n * @param {object|object[]} term - The term(s) to add to the query.\n * @param {object} [options] - Any additional properties to add to the query clause.\n * @returns {lunr.Query}\n * @see lunr.Query#clause\n * @see lunr.Query~Clause\n * @example <caption>adding a single term to a query</caption>\n * query.term(\"foo\")\n * @example <caption>adding a single term to a query and specifying search fields, term boost and automatic trailing wildcard</caption>\n * query.term(\"foo\", {\n *   fields: [\"title\"],\n *   boost: 10,\n *   wildcard: lunr.Query.wildcard.TRAILING\n * })\n * @example <caption>using lunr.tokenizer to convert a string to tokens before using them as terms</caption>\n * query.term(lunr.tokenizer(\"foo bar\"))\n */\nlunr.Query.prototype.term = function (term, options) {\n  if (Array.isArray(term)) {\n    term.forEach(function (t) { this.term(t, lunr.utils.clone(options)) }, this)\n    return this\n  }\n\n  var clause = options || {}\n  clause.term = term.toString()\n\n  this.clause(clause)\n\n  return this\n}\nlunr.QueryParseError = function (message, start, end) {\n  this.name = \"QueryParseError\"\n  this.message = message\n  this.start = start\n  this.end = end\n}\n\nlunr.QueryParseError.prototype = new Error\nlunr.QueryLexer = function (str) {\n  this.lexemes = []\n  this.str = str\n  this.length = str.length\n  this.pos = 0\n  this.start = 0\n  this.escapeCharPositions = []\n}\n\nlunr.QueryLexer.prototype.run = function () {\n  var state = lunr.QueryLexer.lexText\n\n  while (state) {\n    state = state(this)\n  }\n}\n\nlunr.QueryLexer.prototype.sliceString = function () {\n  var subSlices = [],\n      sliceStart = this.start,\n      sliceEnd = this.pos\n\n  for (var i = 0; i < this.escapeCharPositions.length; i++) {\n    sliceEnd = this.escapeCharPositions[i]\n    subSlices.push(this.str.slice(sliceStart, sliceEnd))\n    sliceStart = sliceEnd + 1\n  }\n\n  subSlices.push(this.str.slice(sliceStart, this.pos))\n  this.escapeCharPositions.length = 0\n\n  return subSlices.join('')\n}\n\nlunr.QueryLexer.prototype.emit = function (type) {\n  this.lexemes.push({\n    type: type,\n    str: this.sliceString(),\n    start: this.start,\n    end: this.pos\n  })\n\n  this.start = this.pos\n}\n\nlunr.QueryLexer.prototype.escapeCharacter = function () {\n  this.escapeCharPositions.push(this.pos - 1)\n  this.pos += 1\n}\n\nlunr.QueryLexer.prototype.next = function () {\n  if (this.pos >= this.length) {\n    return lunr.QueryLexer.EOS\n  }\n\n  var char = this.str.charAt(this.pos)\n  this.pos += 1\n  return char\n}\n\nlunr.QueryLexer.prototype.width = function () {\n  return this.pos - this.start\n}\n\nlunr.QueryLexer.prototype.ignore = function () {\n  if (this.start == this.pos) {\n    this.pos += 1\n  }\n\n  this.start = this.pos\n}\n\nlunr.QueryLexer.prototype.backup = function () {\n  this.pos -= 1\n}\n\nlunr.QueryLexer.prototype.acceptDigitRun = function () {\n  var char, charCode\n\n  do {\n    char = this.next()\n    charCode = char.charCodeAt(0)\n  } while (charCode > 47 && charCode < 58)\n\n  if (char != lunr.QueryLexer.EOS) {\n    this.backup()\n  }\n}\n\nlunr.QueryLexer.prototype.more = function () {\n  return this.pos < this.length\n}\n\nlunr.QueryLexer.EOS = 'EOS'\nlunr.QueryLexer.FIELD = 'FIELD'\nlunr.QueryLexer.TERM = 'TERM'\nlunr.QueryLexer.EDIT_DISTANCE = 'EDIT_DISTANCE'\nlunr.QueryLexer.BOOST = 'BOOST'\nlunr.QueryLexer.PRESENCE = 'PRESENCE'\n\nlunr.QueryLexer.lexField = function (lexer) {\n  lexer.backup()\n  lexer.emit(lunr.QueryLexer.FIELD)\n  lexer.ignore()\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexTerm = function (lexer) {\n  if (lexer.width() > 1) {\n    lexer.backup()\n    lexer.emit(lunr.QueryLexer.TERM)\n  }\n\n  lexer.ignore()\n\n  if (lexer.more()) {\n    return lunr.QueryLexer.lexText\n  }\n}\n\nlunr.QueryLexer.lexEditDistance = function (lexer) {\n  lexer.ignore()\n  lexer.acceptDigitRun()\n  lexer.emit(lunr.QueryLexer.EDIT_DISTANCE)\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexBoost = function (lexer) {\n  lexer.ignore()\n  lexer.acceptDigitRun()\n  lexer.emit(lunr.QueryLexer.BOOST)\n  return lunr.QueryLexer.lexText\n}\n\nlunr.QueryLexer.lexEOS = function (lexer) {\n  if (lexer.width() > 0) {\n    lexer.emit(lunr.QueryLexer.TERM)\n  }\n}\n\n// This matches the separator used when tokenising fields\n// within a document. These should match otherwise it is\n// not possible to search for some tokens within a document.\n//\n// It is possible for the user to change the separator on the\n// tokenizer so it _might_ clash with any other of the special\n// characters already used within the search string, e.g. :.\n//\n// This means that it is possible to change the separator in\n// such a way that makes some words unsearchable using a search\n// string.\nlunr.QueryLexer.termSeparator = lunr.tokenizer.separator\n\nlunr.QueryLexer.lexText = function (lexer) {\n  while (true) {\n    var char = lexer.next()\n\n    if (char == lunr.QueryLexer.EOS) {\n      return lunr.QueryLexer.lexEOS\n    }\n\n    // Escape character is '\\'\n    if (char.charCodeAt(0) == 92) {\n      lexer.escapeCharacter()\n      continue\n    }\n\n    if (char == \":\") {\n      return lunr.QueryLexer.lexField\n    }\n\n    if (char == \"~\") {\n      lexer.backup()\n      if (lexer.width() > 0) {\n        lexer.emit(lunr.QueryLexer.TERM)\n      }\n      return lunr.QueryLexer.lexEditDistance\n    }\n\n    if (char == \"^\") {\n      lexer.backup()\n      if (lexer.width() > 0) {\n        lexer.emit(lunr.QueryLexer.TERM)\n      }\n      return lunr.QueryLexer.lexBoost\n    }\n\n    // \"+\" indicates term presence is required\n    // checking for length to ensure that only\n    // leading \"+\" are considered\n    if (char == \"+\" && lexer.width() === 1) {\n      lexer.emit(lunr.QueryLexer.PRESENCE)\n      return lunr.QueryLexer.lexText\n    }\n\n    // \"-\" indicates term presence is prohibited\n    // checking for length to ensure that only\n    // leading \"-\" are considered\n    if (char == \"-\" && lexer.width() === 1) {\n      lexer.emit(lunr.QueryLexer.PRESENCE)\n      return lunr.QueryLexer.lexText\n    }\n\n    if (char.match(lunr.QueryLexer.termSeparator)) {\n      return lunr.QueryLexer.lexTerm\n    }\n  }\n}\n\nlunr.QueryParser = function (str, query) {\n  this.lexer = new lunr.QueryLexer (str)\n  this.query = query\n  this.currentClause = {}\n  this.lexemeIdx = 0\n}\n\nlunr.QueryParser.prototype.parse = function () {\n  this.lexer.run()\n  this.lexemes = this.lexer.lexemes\n\n  var state = lunr.QueryParser.parseClause\n\n  while (state) {\n    state = state(this)\n  }\n\n  return this.query\n}\n\nlunr.QueryParser.prototype.peekLexeme = function () {\n  return this.lexemes[this.lexemeIdx]\n}\n\nlunr.QueryParser.prototype.consumeLexeme = function () {\n  var lexeme = this.peekLexeme()\n  this.lexemeIdx += 1\n  return lexeme\n}\n\nlunr.QueryParser.prototype.nextClause = function () {\n  var completedClause = this.currentClause\n  this.query.clause(completedClause)\n  this.currentClause = {}\n}\n\nlunr.QueryParser.parseClause = function (parser) {\n  var lexeme = parser.peekLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  switch (lexeme.type) {\n    case lunr.QueryLexer.PRESENCE:\n      return lunr.QueryParser.parsePresence\n    case lunr.QueryLexer.FIELD:\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expected either a field or a term, found \" + lexeme.type\n\n      if (lexeme.str.length >= 1) {\n        errorMessage += \" with value '\" + lexeme.str + \"'\"\n      }\n\n      throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n}\n\nlunr.QueryParser.parsePresence = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  switch (lexeme.str) {\n    case \"-\":\n      parser.currentClause.presence = lunr.Query.presence.PROHIBITED\n      break\n    case \"+\":\n      parser.currentClause.presence = lunr.Query.presence.REQUIRED\n      break\n    default:\n      var errorMessage = \"unrecognised presence operator'\" + lexeme.str + \"'\"\n      throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    var errorMessage = \"expecting term or field, found nothing\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.FIELD:\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expecting term or field, found '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseField = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  if (parser.query.allFields.indexOf(lexeme.str) == -1) {\n    var possibleFields = parser.query.allFields.map(function (f) { return \"'\" + f + \"'\" }).join(', '),\n        errorMessage = \"unrecognised field '\" + lexeme.str + \"', possible fields: \" + possibleFields\n\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.fields = [lexeme.str]\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    var errorMessage = \"expecting term, found nothing\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      return lunr.QueryParser.parseTerm\n    default:\n      var errorMessage = \"expecting term, found '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseTerm = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  parser.currentClause.term = lexeme.str.toLowerCase()\n\n  if (lexeme.str.indexOf(\"*\") != -1) {\n    parser.currentClause.usePipeline = false\n  }\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseEditDistance = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  var editDistance = parseInt(lexeme.str, 10)\n\n  if (isNaN(editDistance)) {\n    var errorMessage = \"edit distance must be numeric\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.editDistance = editDistance\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\nlunr.QueryParser.parseBoost = function (parser) {\n  var lexeme = parser.consumeLexeme()\n\n  if (lexeme == undefined) {\n    return\n  }\n\n  var boost = parseInt(lexeme.str, 10)\n\n  if (isNaN(boost)) {\n    var errorMessage = \"boost must be numeric\"\n    throw new lunr.QueryParseError (errorMessage, lexeme.start, lexeme.end)\n  }\n\n  parser.currentClause.boost = boost\n\n  var nextLexeme = parser.peekLexeme()\n\n  if (nextLexeme == undefined) {\n    parser.nextClause()\n    return\n  }\n\n  switch (nextLexeme.type) {\n    case lunr.QueryLexer.TERM:\n      parser.nextClause()\n      return lunr.QueryParser.parseTerm\n    case lunr.QueryLexer.FIELD:\n      parser.nextClause()\n      return lunr.QueryParser.parseField\n    case lunr.QueryLexer.EDIT_DISTANCE:\n      return lunr.QueryParser.parseEditDistance\n    case lunr.QueryLexer.BOOST:\n      return lunr.QueryParser.parseBoost\n    case lunr.QueryLexer.PRESENCE:\n      parser.nextClause()\n      return lunr.QueryParser.parsePresence\n    default:\n      var errorMessage = \"Unexpected lexeme type '\" + nextLexeme.type + \"'\"\n      throw new lunr.QueryParseError (errorMessage, nextLexeme.start, nextLexeme.end)\n  }\n}\n\n  /**\n   * export the module via AMD, CommonJS or as a browser global\n   * Export code from https://github.com/umdjs/umd/blob/master/returnExports.js\n   */\n  ;(function (root, factory) {\n    if (typeof define === 'function' && define.amd) {\n      // AMD. Register as an anonymous module.\n      define(factory)\n    } else if (typeof exports === 'object') {\n      /**\n       * Node. Does not work with strict CommonJS, but\n       * only CommonJS-like enviroments that support module.exports,\n       * like Node.\n       */\n      module.exports = factory()\n    } else {\n      // Browser globals (root is window)\n      root.lunr = factory()\n    }\n  }(this, function () {\n    /**\n     * Just return a value to define the module export.\n     * This example returns an object, but the module\n     * can return a function as the exported value.\n     */\n    return lunr\n  }))\n})();\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndexOptions, SearchResult } from \"modules\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search message type\n */\nexport const enum SearchMessageType {\n  SETUP,                               /* Search index setup */\n  DUMP,                                /* Search index dump */\n  QUERY,                               /* Search query */\n  RESULT                               /* Search results */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message containing the data necessary to setup the search index\n */\nexport interface SearchSetupMessage {\n  type: SearchMessageType.SETUP        /* Message type */\n  data: SearchIndexOptions             /* Message data */\n}\n\n/**\n * A message containing the a dump of the search index\n */\nexport interface SearchDumpMessage {\n  type: SearchMessageType.DUMP        /* Message type */\n  data: string                        /* Message data */\n}\n\n/**\n * A message containing a search query\n */\nexport interface SearchQueryMessage {\n  type: SearchMessageType.QUERY        /* Message type */\n  data: string                         /* Message data */\n}\n\n/**\n * A message containing results for a search query\n */\nexport interface SearchResultMessage {\n  type: SearchMessageType.RESULT       /* Message type */\n  data: SearchResult[]                 /* Message data */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * A message exchanged with the search worker\n */\nexport type SearchMessage =\n  | SearchSetupMessage\n  | SearchDumpMessage\n  | SearchQueryMessage\n  | SearchResultMessage\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Type guard for search setup messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchSetupMessage(\n  message: SearchMessage\n): message is SearchSetupMessage {\n  return message.type === SearchMessageType.SETUP\n}\n\n/**\n * Type guard for search dump messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchDumpMessage(\n  message: SearchMessage\n): message is SearchDumpMessage {\n  return message.type === SearchMessageType.DUMP\n}\n\n/**\n * Type guard for search query messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchQueryMessage(\n  message: SearchMessage\n): message is SearchQueryMessage {\n  return message.type === SearchMessageType.QUERY\n}\n\n/**\n * Type guard for search result messages\n *\n * @param message - Search worker message\n *\n * @return Test result\n */\nexport function isSearchResultMessage(\n  message: SearchMessage\n): message is SearchResultMessage {\n  return message.type === SearchMessageType.RESULT\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as lunr from \"expose-loader?lunr!lunr\"\n\nimport {\n  ArticleDocument,\n  SearchDocumentMap,\n  SectionDocument,\n  setupSearchDocumentMap\n} from \"../document\"\nimport {\n  SearchHighlightFactoryFn,\n  setupSearchHighlighter\n} from \"../highlight\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search index configuration\n */\nexport interface SearchIndexConfig {\n  lang: string[]                       /* Search languages */\n  separator: string                    /* Search separator */\n}\n\n/**\n * Search index document\n */\nexport interface SearchIndexDocument {\n  location: string                     /* Document location */\n  title: string                        /* Document title */\n  text: string                         /* Document text */\n}\n\n/**\n * Search index pipeline\n */\nexport interface SearchIndexPipeline {\n  trimmer: boolean                     /* Add trimmer to pipeline */\n  stopwords: boolean                   /* Add stopword filter to pipeline */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search index options\n *\n * This interfaces describes the format of the `search_index.json` file which\n * is automatically built by the MkDocs search plugin.\n */\nexport interface SearchIndexOptions {\n  config: SearchIndexConfig            /* Search index configuration */\n  docs: SearchIndexDocument[]          /* Search index documents */\n  pipeline?: SearchIndexPipeline       /* Search index pipeline */\n  index?: object | string              /* Prebuilt or serialized index */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search result\n */\nexport interface SearchResult {\n  article: ArticleDocument             /* Article document */\n  sections: SectionDocument[]          /* Section documents */\n}\n\n/* ----------------------------------------------------------------------------\n * Class\n * ------------------------------------------------------------------------- */\n\nexport class SearchIndex {\n\n  /**\n   * Search document mapping\n   *\n   * A mapping of URLs (including hash fragments) to the actual articles and\n   * sections of the documentation. The search document mapping must be created\n   * regardless of whether the index was prebuilt or not, as lunr itself will\n   * only store the actual index.\n   */\n  protected documents: SearchDocumentMap\n\n  /**\n   * Search highlight factory function\n   */\n  protected highlight: SearchHighlightFactoryFn\n\n  /**\n   * The lunr search index\n   */\n  protected index: lunr.Index\n\n  /**\n   * Create a search index\n   *\n   * @param options - Options\n   */\n  public constructor({ config, docs, pipeline, index }: SearchIndexOptions) {\n    this.documents = setupSearchDocumentMap(docs)\n    this.highlight = setupSearchHighlighter(config)\n\n    /* If no index was given, create it */\n    if (typeof index === \"undefined\") {\n      this.index = lunr(function() {\n        pipeline = pipeline || {\n          trimmer: true,\n          stopwords: true\n        }\n\n        /* Remove stemmer, as it cripples search experience */\n        this.pipeline.reset()\n        if (pipeline.trimmer)\n          this.pipeline.add(lunr.trimmer)\n        if (pipeline.stopwords)\n          this.pipeline.add(lunr.stopWordFilter)\n\n        /* Set up alternate search languages */\n        if (config.lang.length === 1 && config.lang[0] !== \"en\") {\n          this.use((lunr as any)[config.lang[0]])\n        } else if (config.lang.length > 1) {\n          this.use((lunr as any).multiLanguage(...config.lang))\n        }\n\n        /* Setup fields and reference */\n        this.field(\"title\", { boost: 10 })\n        this.field(\"text\")\n        this.ref(\"location\")\n\n        /* Index documents */\n        for (const doc of docs)\n          this.add(doc)\n      })\n\n    /* Prebuilt or serialized index */\n    } else {\n      this.index = lunr.Index.load(\n        typeof index === \"string\"\n          ? JSON.parse(index)\n          : index\n      )\n    }\n  }\n\n  /**\n   * Search for matching documents\n   *\n   * The search index which MkDocs provides is divided up into articles, which\n   * contain the whole content of the individual pages, and sections, which only\n   * contain the contents of the subsections obtained by breaking the individual\n   * pages up at `h1` ... `h6`. As there may be many sections on different pages\n   * with indentical titles (for example within this very project, e.g. \"Usage\"\n   * or \"Installation\"), they need to be put into the context of the containing\n   * page. For this reason, section results are grouped within their respective\n   * articles which are the top-level results that are returned.\n   *\n   * @param query - Query string\n   *\n   * @return Search results\n   */\n  public search(query: string): SearchResult[] {\n    if (query) {\n      try {\n\n        /* Group sections by containing article */\n        const groups = this.index.search(query)\n          .reduce((results, result) => {\n            const document = this.documents.get(result.ref)\n            if (typeof document !== \"undefined\") {\n              if (\"parent\" in document) {\n                const ref = document.parent.location\n                results.set(ref, [...results.get(ref) || [], result])\n              } else {\n                const ref = document.location\n                results.set(ref, results.get(ref) || [])\n              }\n            }\n            return results\n          }, new Map<string, lunr.Index.Result[]>())\n\n        /* Create highlighter for query */\n        const fn = this.highlight(query)\n\n        /* Map groups to search documents */\n        return [...groups].map(([ref, sections]) => ({\n          article: fn(this.documents.get(ref) as ArticleDocument),\n          sections: sections.map(section => {\n            return fn(this.documents.get(section.ref) as SectionDocument)\n          })\n        }))\n\n      /* Log errors to console (for now) */\n      } catch (err) {\n        // tslint:disable-next-line no-console\n        console.warn(`Invalid query: ${query} – see https://bit.ly/2s3ChXG`)\n      }\n    }\n\n    /* Return nothing in case of error or empty query */\n    return []\n  }\n\n  /**\n   * Serialize search index\n   *\n   * @return String representation\n   */\n  public toString(): string {\n    return JSON.stringify(this.index)\n  }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as escapeHTML from \"escape-html\"\n\nimport { SearchIndexDocument } from \"../_\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * A top-level article\n */\nexport interface ArticleDocument extends SearchIndexDocument {\n  linked: boolean                      /* Whether the section was linked */\n}\n\n/**\n * A section of an article\n */\nexport interface SectionDocument extends SearchIndexDocument {\n  parent: ArticleDocument              /* Parent article */\n}\n\n/* ------------------------------------------------------------------------- */\n\n/**\n * Search document\n */\nexport type SearchDocument =\n  | ArticleDocument\n  | SectionDocument\n\n/**\n * Search document mapping\n */\nexport type SearchDocumentMap = Map<string, SearchDocument>\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Create a search document mapping\n *\n * @param docs - Search index documents\n *\n * @return Search document map\n */\nexport function setupSearchDocumentMap(\n  docs: SearchIndexDocument[]\n): SearchDocumentMap {\n  const documents = new Map<string, SearchDocument>()\n  for (const doc of docs) {\n    const [path, hash] = doc.location.split(\"#\")\n\n    /* Extract location and title */\n    const location = doc.location\n    const title    = doc.title\n\n    /* Escape and cleanup text */\n    const text = escapeHTML(doc.text)\n      .replace(/\\s+(?=[,.:;!?])/g, \"\")\n      .replace(/\\s+/g, \" \")\n\n    /* Handle section */\n    if (hash) {\n      const parent = documents.get(path) as ArticleDocument\n\n      /* Ignore first section, override article */\n      if (!parent.linked) {\n        parent.title  = doc.title\n        parent.text   = text\n        parent.linked = true\n\n      /* Add subsequent section */\n      } else {\n        documents.set(location, {\n          location,\n          title,\n          text,\n          parent\n        })\n      }\n\n    /* Add article */\n    } else {\n      documents.set(location, {\n        location,\n        title,\n        text,\n        linked: false\n      })\n    }\n  }\n  return documents\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport * as escapeRegExp from \"escape-string-regexp\"\n\nimport { SearchIndexConfig } from \"../_\"\nimport { SearchDocument } from \"../document\"\n\n/* ----------------------------------------------------------------------------\n * Types\n * ------------------------------------------------------------------------- */\n\n/**\n * Search highlight function\n *\n * @template T - Search document type\n *\n * @param document - Search document\n *\n * @return Highlighted document\n */\nexport type SearchHighlightFn =\n  <T extends SearchDocument>(document: Readonly<T>) => T\n\n/**\n * Search highlight factory function\n *\n * @param query - Query string\n *\n * @return Search highlight function\n */\nexport type SearchHighlightFactoryFn =\n  (query: string) => SearchHighlightFn\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Create a search highlighter\n *\n * @param config - Search index configuration\n *\n * @return Search highlight factory function\n */\nexport function setupSearchHighlighter(\n  config: SearchIndexConfig\n): SearchHighlightFactoryFn {\n  const separator = new RegExp(config.separator, \"img\")\n  const highlight = (_: unknown, data: string, term: string) => {\n    return `${data}<em>${term}</em>`\n  }\n\n  /* Return factory function */\n  return (query: string) => {\n    query = query\n      .replace(/[\\s*+-:~^]+/g, \" \")\n      .trim()\n\n    /* Create search term match expression */\n    const match = new RegExp(`(^|${config.separator})(${\n      escapeRegExp(query).replace(separator, \"|\")\n    })`, \"img\")\n\n    /* Highlight document */\n    return document => ({\n      ...document,\n      title: document.title.replace(match, highlight),\n      text:  document.text.replace(match, highlight)\n    })\n  }\n}\n","/*\n * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to\n * deal in the Software without restriction, including without limitation the\n * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n * sell copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n * IN THE SOFTWARE.\n */\n\nimport { SearchIndex, SearchIndexConfig } from \"modules\"\n\nimport { SearchMessage, SearchMessageType } from \"../message\"\n\n/* ----------------------------------------------------------------------------\n * Data\n * ------------------------------------------------------------------------- */\n\n/**\n * Search index\n */\nlet index: SearchIndex\n\n/* ----------------------------------------------------------------------------\n * Helper functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Setup multi-language support through `lunr-languages`\n *\n * @param config - Search index configuration\n */\nfunction setupLunrLanguages(config: SearchIndexConfig): void {\n  const base = \"../lunr\"\n\n  /* Add scripts for languages */\n  const scripts = []\n  for (const lang of config.lang) {\n    if (lang === \"ja\") scripts.push(`${base}/tinyseg.js`)\n    if (lang !== \"en\") scripts.push(`${base}/min/lunr.${lang}.min.js`)\n  }\n\n  /* Add multi-language support */\n  if (scripts.length > 1)\n    scripts.push(`${base}/min/lunr.multi.min.js`)\n\n  /* Load scripts synchronously */\n  if (scripts.length)\n    importScripts(\n      `${base}/min/lunr.stemmer.support.min.js`,\n      ...scripts\n    )\n}\n\n/* ----------------------------------------------------------------------------\n * Functions\n * ------------------------------------------------------------------------- */\n\n/**\n * Message handler\n *\n * @param message - Source message\n *\n * @return Target message\n */\nexport function handler(message: SearchMessage): SearchMessage {\n  switch (message.type) {\n\n    /* Setup search index */\n    case SearchMessageType.SETUP:\n      setupLunrLanguages(message.data.config)\n      index = new SearchIndex(message.data)\n      return {\n        type: SearchMessageType.DUMP,\n        data: index.toString()\n      }\n\n    /* Query search index */\n    case SearchMessageType.QUERY:\n      return {\n        type: SearchMessageType.RESULT,\n        data: index ? index.search(message.data) : []\n      }\n\n    /* All other messages */\n    default:\n      throw new TypeError(\"Invalid message type\")\n  }\n}\n\n/* ----------------------------------------------------------------------------\n * Worker\n * ------------------------------------------------------------------------- */\n\nself.addEventListener(\"message\", ev => {\n  self.postMessage(handler(ev.data))\n})\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/material/assets/manifest.json b/material/assets/manifest.json
index 773af94e4..a43fa9262 100644
--- a/material/assets/manifest.json
+++ b/material/assets/manifest.json
@@ -1,10 +1,10 @@
 {
-  "assets/javascripts/bundle.js": "assets/javascripts/bundle.96943303.min.js",
-  "assets/javascripts/bundle.js.map": "assets/javascripts/bundle.96943303.min.js.map",
-  "assets/javascripts/worker/packer.js": "assets/javascripts/worker/packer.819c2a16.min.js",
-  "assets/javascripts/worker/packer.js.map": "assets/javascripts/worker/packer.819c2a16.min.js.map",
-  "assets/javascripts/worker/search.js": "assets/javascripts/worker/search.03c9bfda.min.js",
-  "assets/javascripts/worker/search.js.map": "assets/javascripts/worker/search.03c9bfda.min.js.map",
+  "assets/javascripts/bundle.js": "assets/javascripts/bundle.65b5374b.min.js",
+  "assets/javascripts/bundle.js.map": "assets/javascripts/bundle.65b5374b.min.js.map",
+  "assets/javascripts/worker/packer.js": "assets/javascripts/worker/packer.c14659e8.min.js",
+  "assets/javascripts/worker/packer.js.map": "assets/javascripts/worker/packer.c14659e8.min.js.map",
+  "assets/javascripts/worker/search.js": "assets/javascripts/worker/search.ce66ce8d.min.js",
+  "assets/javascripts/worker/search.js.map": "assets/javascripts/worker/search.ce66ce8d.min.js.map",
   "assets/stylesheets/app-palette.scss": "assets/stylesheets/app-palette.8c25017f.min.css",
-  "assets/stylesheets/app.scss": "assets/stylesheets/app.0d3546bb.min.css"
+  "assets/stylesheets/app.scss": "assets/stylesheets/app.a6040c1b.min.css"
 }
\ No newline at end of file
diff --git a/material/assets/stylesheets/app.0d3546bb.min.css b/material/assets/stylesheets/app.0d3546bb.min.css
deleted file mode 100644
index e2f20e7ad..000000000
--- a/material/assets/stylesheets/app.0d3546bb.min.css
+++ /dev/null
@@ -1 +0,0 @@
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.25s;opacity:1}.md-search__inner{position:relative;width:11.7rem;padding:.1rem 0;float:right;-webkit-transition:width .25s cubic-bezier(0.1, 0.7, 0.1, 1);transition:width .25s cubic-bezier(0.1, 0.7, 0.1, 1)}[dir=rtl] .md-search__inner{float:left}.md-search__form{border-radius:.1rem}.md-search__input{width:100%;height:1.8rem;padding-left:2.2rem;-webkit-transition:background-color .25s cubic-bezier(0.1, 0.7, 0.1, 1),color .25s cubic-bezier(0.1, 0.7, 0.1, 1);transition:background-color .25s cubic-bezier(0.1, 0.7, 0.1, 1),color .25s cubic-bezier(0.1, 0.7, 0.1, 1);border-radius:.1rem;background-color:rgba(0,0,0,.26);color:inherit;font-size:.8rem}[dir=rtl] .md-search__input{padding-right:2.2rem}.md-search__input+.md-search__icon{color:inherit}.md-search__input::-webkit-input-placeholder{color:rgba(255,255,255,.7)}.md-search__input::-moz-placeholder{color:rgba(255,255,255,.7)}.md-search__input:-ms-input-placeholder{color:rgba(255,255,255,.7)}.md-search__input::-ms-input-placeholder{color:rgba(255,255,255,.7)}.md-search__input::placeholder{color:rgba(255,255,255,.7)}.md-search__input:hover{background-color:rgba(255,255,255,.12)}[data-md-toggle=search]:checked~.md-header .md-search__input{border-radius:.1rem .1rem 0 0;background-color:#fff;color:rgba(0,0,0,.87);text-overflow:clip}[data-md-toggle=search]:checked~.md-header .md-search__input::-webkit-input-placeholder{color:rgba(0,0,0,.54)}[data-md-toggle=search]:checked~.md-header .md-search__input::-moz-placeholder{color:rgba(0,0,0,.54)}[data-md-toggle=search]:checked~.md-header .md-search__input:-ms-input-placeholder{color:rgba(0,0,0,.54)}[data-md-toggle=search]:checked~.md-header .md-search__input::-ms-input-placeholder{color:rgba(0,0,0,.54)}[data-md-toggle=search]:checked~.md-header .md-search__input+.md-search__icon,[data-md-toggle=search]:checked~.md-header .md-search__input::placeholder{color:rgba(0,0,0,.54)}.md-search__output{top:1.9rem;-webkit-transition:opacity .4s;transition:opacity .4s;opacity:0}[data-md-toggle=search]:checked~.md-header .md-search__output{box-shadow:0 6px 10px 0 rgba(0,0,0,.14),0 1px 18px 0 rgba(0,0,0,.12),0 3px 5px -1px rgba(0,0,0,.4);opacity:1}.md-search__scrollwrap{max-height:0}[data-md-toggle=search]:checked~.md-header .md-search__scrollwrap{max-height:75vh}.md-search__scrollwrap::-webkit-scrollbar{width:.2rem;height:.2rem}.md-search__scrollwrap::-webkit-scrollbar-thumb{background-color:rgba(0,0,0,.26)}.md-search__scrollwrap::-webkit-scrollbar-thumb:hover{background-color:#536dfe}.md-search-result__meta{padding-left:2.2rem}[dir=rtl] .md-search-result__meta{padding-right:2.2rem;padding-left:initial}.md-search-result__article{padding-left:2.2rem}[dir=rtl] .md-search-result__article{padding-right:2.2rem;padding-left:.8rem}.md-sidebar--secondary{display:block;margin-left:calc(100% - 12.1rem)}[dir=rtl] .md-sidebar--secondary{margin-right:calc(100% - 12.1rem);margin-left:initial}.md-sidebar--secondary .md-sidebar__scrollwrap{-webkit-overflow-scrolling:touch}}@media only screen and (min-width: 76.25em){.md-content{margin-left:12.1rem}[dir=rtl] .md-content{margin-right:12.1rem}.md-content__inner{margin-right:1.2rem;margin-left:1.2rem}.md-header-nav__button.md-icon--menu{display:none}.md-header-nav__source{margin-left:1.4rem}[dir=rtl] .md-header-nav__source{margin-right:1.4rem}.md-nav{-webkit-transition:max-height .25s cubic-bezier(0.86, 0, 0.07, 1);transition:max-height .25s cubic-bezier(0.86, 0, 0.07, 1)}.md-nav__toggle~.md-nav{max-height:0;overflow:hidden}.no-js .md-nav__toggle~.md-nav{display:none}.md-nav__toggle:checked~.md-nav{max-height:100%}.md-nav__item--nested>.md-nav>.md-nav__title{display:none}.md-nav__item--nested>.md-nav__link::after{display:inline-block;-webkit-transform-origin:.45em .45em;transform-origin:.45em .45em;-webkit-transform-style:preserve-3d;transform-style:preserve-3d;vertical-align:-0.125em}.js .md-nav__item--nested>.md-nav__link::after{-webkit-transition:-webkit-transform .4s;transition:-webkit-transform .4s;transition:transform .4s;transition:transform .4s, -webkit-transform .4s}.md-nav__item--nested .md-nav__toggle:checked~.md-nav__link::after{-webkit-transform:rotateX(180deg);transform:rotateX(180deg)}[data-md-toggle=search]:checked~.md-header .md-search__inner{width:34.4rem}.md-search__scrollwrap{width:34.4rem}.md-sidebar--secondary{margin-left:48.9rem}[dir=rtl] .md-sidebar--secondary{margin-right:48.9rem;margin-left:initial}.md-tabs~.md-main .md-nav--primary>.md-nav__list>.md-nav__item--nested{max-height:0;font-size:0;visibility:hidden}.md-tabs--active~.md-main .md-nav--primary .md-nav__title{display:block;padding:0}.md-tabs--active~.md-main .md-nav--primary .md-nav__title--site{display:none}.no-js .md-tabs--active~.md-main .md-nav--primary .md-nav{display:block}.md-tabs--active~.md-main .md-nav--primary>.md-nav__list>.md-nav__item{font-size:0;visibility:hidden}.md-tabs--active~.md-main .md-nav--primary>.md-nav__list>.md-nav__item--nested{display:none;max-height:none;font-size:.7rem;overflow:auto;visibility:visible}.md-tabs--active~.md-main .md-nav--primary>.md-nav__list>.md-nav__item--nested>.md-nav__link{display:none}.md-tabs--active~.md-main .md-nav--primary>.md-nav__list>.md-nav__item--active{display:block}.md-tabs--active~.md-main .md-nav[data-md-level="1"]{max-height:initial;overflow:visible}.md-tabs--active~.md-main .md-nav[data-md-level="1"]>.md-nav__list>.md-nav__item{padding-left:0}.md-tabs--active~.md-main .md-nav[data-md-level="1"] .md-nav .md-nav__title{display:none}}@media only screen and (min-width: 45em){.md-footer-nav__link{width:50%}.md-footer-copyright{max-width:75%;float:left}[dir=rtl] .md-footer-copyright{float:right}.md-footer-social{padding:.6rem 0;float:right}[dir=rtl] .md-footer-social{float:left}}@media only screen and (max-width: 29.9375em){[data-md-toggle=search]:checked~.md-header .md-search__overlay{-webkit-transform:scale(45);transform:scale(45)}}@media only screen and (min-width: 30em)and (max-width: 44.9375em){[data-md-toggle=search]:checked~.md-header .md-search__overlay{-webkit-transform:scale(60);transform:scale(60)}}@media only screen and (min-width: 45em)and (max-width: 59.9375em){[data-md-toggle=search]:checked~.md-header .md-search__overlay{-webkit-transform:scale(75);transform:scale(75)}}@media only screen and (min-width: 60em)and (max-width: 76.1875em){[data-md-toggle=search]:checked~.md-header .md-search__inner{width:23.4rem}.md-search__scrollwrap{width:23.4rem}.md-search-result__teaser{max-height:2.5rem;-webkit-line-clamp:3}}@media(-webkit-max-device-pixel-ratio: 1), (max-resolution: 1dppx){.md-search__scrollwrap{-webkit-transform:translateZ(0);transform:translateZ(0)}}
\ No newline at end of file
diff --git a/material/base.html b/material/base.html
index 4d040f292..d5a5b2f3d 100644
--- a/material/base.html
+++ b/material/base.html
@@ -43,7 +43,7 @@
       {% endif %}
     {% endblock %}
     {% block styles %}
-      <link rel="stylesheet" href="{{ 'assets/stylesheets/app.0d3546bb.min.css' | url }}">
+      <link rel="stylesheet" href="{{ 'assets/stylesheets/app.a6040c1b.min.css' | url }}">
       {% if palette.primary or palette.accent %}
         <link rel="stylesheet" href="{{ 'assets/stylesheets/app-palette.8c25017f.min.css' | url }}">
       {% endif %}
@@ -188,7 +188,7 @@
       {% endblock %}
     </div>
     {% block scripts %}
-      <script src="{{ 'assets/javascripts/bundle.96943303.min.js' | url }}"></script>
+      <script src="{{ 'assets/javascripts/bundle.65b5374b.min.js' | url }}"></script>
       <script id="__lang" type="application/json">
         {%- set translations = {} -%}
         {%- for key in [
@@ -207,7 +207,7 @@
         {%- endfor -%}
         {{ translations | tojson }}
       </script>
-      <script>app=initialize({base:"{{ base_url }}",worker:{search:"{{ 'assets/javascripts/worker/search.03c9bfda.min.js' | url }}",packer:"{{ 'assets/javascripts/worker/packer.819c2a16.min.js' | url }}"}})</script>
+      <script>app=initialize({base:"{{ base_url }}",worker:{search:"{{ 'assets/javascripts/worker/search.ce66ce8d.min.js' | url }}",packer:"{{ 'assets/javascripts/worker/packer.c14659e8.min.js' | url }}"}})</script>
       {% for path in config["extra_javascript"] %}
         <script src="{{ path | url }}"></script>
       {% endfor %}
diff --git a/package-lock.json b/package-lock.json
index 9486c03db..78644289c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -321,15 +321,6 @@
       "integrity": "sha512-yWj3OnlKlwNpq9+Jh/nJkVAD3ta8Abk2kIRpjWpVkDlAD43tn6Q6xk5hurp84ndcq54jBDBGCD/WcIR0pspG0A==",
       "dev": true
     },
-    "@types/mini-css-extract-plugin": {
-      "version": "0.9.0",
-      "resolved": "https://registry.npmjs.org/@types/mini-css-extract-plugin/-/mini-css-extract-plugin-0.9.0.tgz",
-      "integrity": "sha512-y+/Z/FtQ0h0Ps9PYbYeBd9fVl1z4215gpvGcYfl20+jMWBngEKDNzQ2an2kz+cLL47SS6Y2f6Z4axdSoyNgNAw==",
-      "dev": true,
-      "requires": {
-        "@types/webpack": "*"
-      }
-    },
     "@types/minimatch": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -639,51 +630,6 @@
       "integrity": "sha512-gac8OEcQ2Li1dxIEWGZzsp2BitJxwkwcOm0zHAJLcPJaVvm58FRnk6RkuLRpU1EujipU2ZFODv2P9DLMfnV8mw==",
       "dev": true
     },
-    "adjust-sourcemap-loader": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/adjust-sourcemap-loader/-/adjust-sourcemap-loader-2.0.0.tgz",
-      "integrity": "sha512-4hFsTsn58+YjrU9qKzML2JSSDqKvN8mUGQ0nNIrfPi8hmIONT4L3uUaT6MKdMsZ9AjsU6D2xDkZxCkbQPxChrA==",
-      "dev": true,
-      "requires": {
-        "assert": "1.4.1",
-        "camelcase": "5.0.0",
-        "loader-utils": "1.2.3",
-        "object-path": "0.11.4",
-        "regex-parser": "2.2.10"
-      },
-      "dependencies": {
-        "assert": {
-          "version": "1.4.1",
-          "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
-          "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
-          "dev": true,
-          "requires": {
-            "util": "0.10.3"
-          }
-        },
-        "camelcase": {
-          "version": "5.0.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.0.0.tgz",
-          "integrity": "sha512-faqwZqnWxbxn+F1d399ygeamQNy3lPp/H9H6rNrqYh4FSVCtcY+3cub1MxA8o9mDd55mM8Aghuu/kuyYA6VTsA==",
-          "dev": true
-        },
-        "inherits": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
-          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
-          "dev": true
-        },
-        "util": {
-          "version": "0.10.3",
-          "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
-          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
-          "dev": true,
-          "requires": {
-            "inherits": "2.0.1"
-          }
-        }
-      }
-    },
     "ajv": {
       "version": "6.10.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
@@ -757,12 +703,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "arity-n": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/arity-n/-/arity-n-1.0.4.tgz",
-      "integrity": "sha1-2edrEXM+CFacCEeuezmyhgswt0U=",
-      "dev": true
-    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -1571,6 +1511,16 @@
         "source-map": "~0.6.0"
       }
     },
+    "clean-webpack-plugin": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/clean-webpack-plugin/-/clean-webpack-plugin-3.0.0.tgz",
+      "integrity": "sha512-MciirUH5r+cYLGCOL5JX/ZLzOZbVr1ot3Fw+KcvbhUb6PM+yycqd9ZhIlcigQ5gl+XhppNmw3bEFuaaMNyLj3A==",
+      "dev": true,
+      "requires": {
+        "@types/webpack": "^4.4.31",
+        "del": "^4.1.1"
+      }
+    },
     "cli-boxes": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/cli-boxes/-/cli-boxes-1.0.0.tgz",
@@ -1664,15 +1614,6 @@
       "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
       "dev": true
     },
-    "compose-function": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/compose-function/-/compose-function-3.0.3.tgz",
-      "integrity": "sha1-ntZ18TzFRQHTCVCkhv9qe6OrGF8=",
-      "dev": true,
-      "requires": {
-        "arity-n": "^1.0.4"
-      }
-    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -1926,18 +1867,6 @@
       "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
       "dev": true
     },
-    "css": {
-      "version": "2.2.4",
-      "resolved": "https://registry.npmjs.org/css/-/css-2.2.4.tgz",
-      "integrity": "sha512-oUnjmWpy0niI3x/mPL8dVEI1l7MnG3+HHyRPHf+YFSbK+svOhXpmSOcDURUh2aOCgl2grzrOPt1nHLuCVFULLw==",
-      "dev": true,
-      "requires": {
-        "inherits": "^2.0.3",
-        "source-map": "^0.6.1",
-        "source-map-resolve": "^0.5.2",
-        "urix": "^0.1.0"
-      }
-    },
     "css-loader": {
       "version": "3.4.2",
       "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-3.4.2.tgz",
@@ -2029,16 +1958,6 @@
       "integrity": "sha1-WW6WmP0MgOEgOMK4LW6xs1tiJNk=",
       "dev": true
     },
-    "d": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
-      "integrity": "sha512-m62ShEObQ39CfralilEQRjH6oAMtNCV1xJyEx5LpRYUVN+EviphDgUc/F3hnYbADmkiNs67Y+3ylmlG7Lnu+FA==",
-      "dev": true,
-      "requires": {
-        "es5-ext": "^0.10.50",
-        "type": "^1.0.1"
-      }
-    },
     "debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -2129,6 +2048,50 @@
         }
       }
     },
+    "del": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/del/-/del-4.1.1.tgz",
+      "integrity": "sha512-QwGuEUouP2kVwQenAsOof5Fv8K9t3D8Ca8NxcXKrIpEHjTXK5J2nXLdP+ALI1cgv8wj7KuwBhTwBkOZSJKM5XQ==",
+      "dev": true,
+      "requires": {
+        "@types/glob": "^7.1.1",
+        "globby": "^6.1.0",
+        "is-path-cwd": "^2.0.0",
+        "is-path-in-cwd": "^2.0.0",
+        "p-map": "^2.0.0",
+        "pify": "^4.0.1",
+        "rimraf": "^2.6.3"
+      },
+      "dependencies": {
+        "globby": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/globby/-/globby-6.1.0.tgz",
+          "integrity": "sha1-9abXDoOV4hyFj7BInWTfAkJNUGw=",
+          "dev": true,
+          "requires": {
+            "array-union": "^1.0.1",
+            "glob": "^7.0.3",
+            "object-assign": "^4.0.1",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0"
+          },
+          "dependencies": {
+            "pify": {
+              "version": "2.3.0",
+              "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+              "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
+              "dev": true
+            }
+          }
+        },
+        "pify": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+          "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+          "dev": true
+        }
+      }
+    },
     "delegate": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/delegate/-/delegate-3.2.0.tgz",
@@ -2335,38 +2298,6 @@
         "is-arrayish": "^0.2.1"
       }
     },
-    "es5-ext": {
-      "version": "0.10.53",
-      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
-      "integrity": "sha512-Xs2Stw6NiNHWypzRTY1MtaG/uJlwCk8kH81920ma8mvN8Xq1gsfhZvpkImLQArw8AHnv8MT2I45J3c0R8slE+Q==",
-      "dev": true,
-      "requires": {
-        "es6-iterator": "~2.0.3",
-        "es6-symbol": "~3.1.3",
-        "next-tick": "~1.0.0"
-      }
-    },
-    "es6-iterator": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
-      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
-      "dev": true,
-      "requires": {
-        "d": "1",
-        "es5-ext": "^0.10.35",
-        "es6-symbol": "^3.1.1"
-      }
-    },
-    "es6-symbol": {
-      "version": "3.1.3",
-      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.3.tgz",
-      "integrity": "sha512-NJ6Yn3FuDinBaBRWl/q5X/s4koRHBrgKAu+yGI6JCBeiu3qrcbJhwT2GeR/EXVfylRk8dpQVJoLEFhK+Mu31NA==",
-      "dev": true,
-      "requires": {
-        "d": "^1.0.1",
-        "ext": "^1.1.2"
-      }
-    },
     "escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -2510,23 +2441,6 @@
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       "dev": true
     },
-    "ext": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/ext/-/ext-1.4.0.tgz",
-      "integrity": "sha512-Key5NIsUxdqKg3vIsdw9dSuXpPCQ297y6wBjL30edxwPgt2E44WcWBZey/ZvUc6sERLTxKdyCu4gZFmUbk1Q7A==",
-      "dev": true,
-      "requires": {
-        "type": "^2.0.0"
-      },
-      "dependencies": {
-        "type": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/type/-/type-2.0.0.tgz",
-          "integrity": "sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow==",
-          "dev": true
-        }
-      }
-    },
     "extend": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
@@ -4163,6 +4077,32 @@
       "integrity": "sha1-PkcprB9f3gJc19g6iW2rn09n2w8=",
       "dev": true
     },
+    "is-path-cwd": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.2.0.tgz",
+      "integrity": "sha512-w942bTcih8fdJPJmQHFzkS76NEP8Kzzvmw92cXsazb8intwLqPibPPdXf4ANdKV3rYMuuQYGIWtvz9JilB3NFQ==",
+      "dev": true
+    },
+    "is-path-in-cwd": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-2.1.0.tgz",
+      "integrity": "sha512-rNocXHgipO+rvnP6dk3zI20RpOtrAM/kzbB258Uw5BWr3TpXi861yzjo16Dn4hUox07iw5AyeMLHWsujkjzvRQ==",
+      "dev": true,
+      "requires": {
+        "is-path-inside": "^2.1.0"
+      },
+      "dependencies": {
+        "is-path-inside": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/is-path-inside/-/is-path-inside-2.1.0.tgz",
+          "integrity": "sha512-wiyhTzfDWsvwAW53OBWF5zuvaOGlZ6PwYxAbPVDhpm+gM09xKQGjBq/8uYN12aDvMxnAnq3dxTyoSoRNmg5YFg==",
+          "dev": true,
+          "requires": {
+            "path-is-inside": "^1.0.2"
+          }
+        }
+      }
+    },
     "is-path-inside": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/is-path-inside/-/is-path-inside-1.0.1.tgz",
@@ -4643,30 +4583,12 @@
         "brorand": "^1.0.1"
       }
     },
-    "mime": {
-      "version": "2.4.4",
-      "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
-      "integrity": "sha512-LRxmNwziLPT828z+4YkNzloCFC2YM4wrB99k+AV5ZbEyfGNWfG8SO1FUXLmLDBSo89NrJZ4DIWeLjy1CHGhMGA==",
-      "dev": true
-    },
     "mimic-fn": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
       "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==",
       "dev": true
     },
-    "mini-css-extract-plugin": {
-      "version": "0.9.0",
-      "resolved": "https://registry.npmjs.org/mini-css-extract-plugin/-/mini-css-extract-plugin-0.9.0.tgz",
-      "integrity": "sha512-lp3GeY7ygcgAmVIcRPBVhIkf8Us7FZjA+ILpal44qLdSu11wmjKQ3d9k15lfD7pO4esu9eUIAW7qiYIBppv40A==",
-      "dev": true,
-      "requires": {
-        "loader-utils": "^1.1.0",
-        "normalize-url": "1.9.1",
-        "schema-utils": "^1.0.0",
-        "webpack-sources": "^1.1.0"
-      }
-    },
     "minimalistic-assert": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
@@ -4830,12 +4752,6 @@
       "integrity": "sha512-iyam8fBuCUpWeKPGpaNMetEocMt364qkCsfL9JuhjXX6dRnguRVOfk2GZaDpPjcOKiiXCPINZC1GczQ7iTq3Zw==",
       "dev": true
     },
-    "next-tick": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz",
-      "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw=",
-      "dev": true
-    },
     "nice-try": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-1.0.5.tgz",
@@ -5019,18 +4935,6 @@
       "integrity": "sha1-0LFF62kRicY6eNIB3E/bEpPvDAM=",
       "dev": true
     },
-    "normalize-url": {
-      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/normalize-url/-/normalize-url-1.9.1.tgz",
-      "integrity": "sha1-LMDWazHqIwNkWENuNiDYWVTGbDw=",
-      "dev": true,
-      "requires": {
-        "object-assign": "^4.0.1",
-        "prepend-http": "^1.0.0",
-        "query-string": "^4.1.0",
-        "sort-keys": "^1.0.0"
-      }
-    },
     "npm-run-path": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-2.0.2.tgz",
@@ -5084,12 +4988,6 @@
         }
       }
     },
-    "object-path": {
-      "version": "0.11.4",
-      "resolved": "https://registry.npmjs.org/object-path/-/object-path-0.11.4.tgz",
-      "integrity": "sha1-NwrnUvvzfePqcKhhwju6iRVpGUk=",
-      "dev": true
-    },
     "object-visit": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/object-visit/-/object-visit-1.0.1.tgz",
@@ -5186,6 +5084,12 @@
         "p-limit": "^1.1.0"
       }
     },
+    "p-map": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/p-map/-/p-map-2.1.0.tgz",
+      "integrity": "sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==",
+      "dev": true
+    },
     "p-try": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
@@ -5356,6 +5260,21 @@
       "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
       "dev": true
     },
+    "pinkie": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
+      "integrity": "sha1-clVrgM+g1IqXToDnckjoDtT3+HA=",
+      "dev": true
+    },
+    "pinkie-promise": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
+      "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
+      "dev": true,
+      "requires": {
+        "pinkie": "^2.0.0"
+      }
+    },
     "pkg-dir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-3.0.0.tgz",
@@ -5898,16 +5817,6 @@
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
       "dev": true
     },
-    "query-string": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/query-string/-/query-string-4.3.4.tgz",
-      "integrity": "sha1-u7aTucqRXCMlFbIosaArYJBD2+s=",
-      "dev": true,
-      "requires": {
-        "object-assign": "^4.1.0",
-        "strict-uri-encode": "^1.0.0"
-      }
-    },
     "querystring": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/querystring/-/querystring-0.2.0.tgz",
@@ -6012,12 +5921,6 @@
         "safe-regex": "^1.1.0"
       }
     },
-    "regex-parser": {
-      "version": "2.2.10",
-      "resolved": "https://registry.npmjs.org/regex-parser/-/regex-parser-2.2.10.tgz",
-      "integrity": "sha512-8t6074A68gHfU8Neftl0Le6KTDwfGAj7IyjPIMSfikI2wJUTHDMaIq42bUsfVnj8mhx0R+45rdUXHGpN164avA==",
-      "dev": true
-    },
     "registry-auth-token": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/registry-auth-token/-/registry-auth-token-3.4.0.tgz",
@@ -6195,76 +6098,12 @@
       "integrity": "sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=",
       "dev": true
     },
-    "resolve-url-loader": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/resolve-url-loader/-/resolve-url-loader-3.1.1.tgz",
-      "integrity": "sha512-K1N5xUjj7v0l2j/3Sgs5b8CjrrgtC70SmdCuZiJ8tSyb5J+uk3FoeZ4b7yTnH6j7ngI+Bc5bldHJIa8hYdu2gQ==",
-      "dev": true,
-      "requires": {
-        "adjust-sourcemap-loader": "2.0.0",
-        "camelcase": "5.3.1",
-        "compose-function": "3.0.3",
-        "convert-source-map": "1.7.0",
-        "es6-iterator": "2.0.3",
-        "loader-utils": "1.2.3",
-        "postcss": "7.0.21",
-        "rework": "1.0.1",
-        "rework-visit": "1.0.0",
-        "source-map": "0.6.1"
-      },
-      "dependencies": {
-        "postcss": {
-          "version": "7.0.21",
-          "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.21.tgz",
-          "integrity": "sha512-uIFtJElxJo29QC753JzhidoAhvp/e/Exezkdhfmt8AymWT6/5B7W1WmponYWkHk2eg6sONyTch0A3nkMPun3SQ==",
-          "dev": true,
-          "requires": {
-            "chalk": "^2.4.2",
-            "source-map": "^0.6.1",
-            "supports-color": "^6.1.0"
-          }
-        },
-        "supports-color": {
-          "version": "6.1.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
-          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^3.0.0"
-          }
-        }
-      }
-    },
     "ret": {
       "version": "0.1.15",
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
       "integrity": "sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==",
       "dev": true
     },
-    "rework": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/rework/-/rework-1.0.1.tgz",
-      "integrity": "sha1-MIBqhBNCtUUQqkEQhQzUhTQUSqc=",
-      "dev": true,
-      "requires": {
-        "convert-source-map": "^0.3.3",
-        "css": "^2.0.0"
-      },
-      "dependencies": {
-        "convert-source-map": {
-          "version": "0.3.5",
-          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-0.3.5.tgz",
-          "integrity": "sha1-8dgClQr33SYxof6+BZZVDIarMZA=",
-          "dev": true
-        }
-      }
-    },
-    "rework-visit": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/rework-visit/-/rework-visit-1.0.0.tgz",
-      "integrity": "sha1-mUWygD8hni96ygCtuLyfZA+ELJo=",
-      "dev": true
-    },
     "rimraf": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
@@ -6607,15 +6446,6 @@
         "kind-of": "^3.2.0"
       }
     },
-    "sort-keys": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/sort-keys/-/sort-keys-1.1.2.tgz",
-      "integrity": "sha1-RBttTTRnmPG05J6JIK37oOVD+a0=",
-      "dev": true,
-      "requires": {
-        "is-plain-obj": "^1.0.0"
-      }
-    },
     "source-list-map": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/source-list-map/-/source-list-map-2.0.1.tgz",
@@ -6785,12 +6615,6 @@
       "integrity": "sha512-AiisoFqQ0vbGcZgQPY1cdP2I76glaVA/RauYR4G4thNFgkTqr90yXTo4LYX60Jl+sIlPNHHdGSwo01AvbKUSVQ==",
       "dev": true
     },
-    "strict-uri-encode": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
-      "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=",
-      "dev": true
-    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -7747,12 +7571,6 @@
       "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
       "dev": true
     },
-    "type": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
-      "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg==",
-      "dev": true
-    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -8029,29 +7847,6 @@
         }
       }
     },
-    "url-loader": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/url-loader/-/url-loader-3.0.0.tgz",
-      "integrity": "sha512-a84JJbIA5xTFTWyjjcPdnsu+41o/SNE8SpXMdUvXs6Q+LuhCD9E2+0VCiuDWqgo3GGXVlFHzArDmBpj9PgWn4A==",
-      "dev": true,
-      "requires": {
-        "loader-utils": "^1.2.3",
-        "mime": "^2.4.4",
-        "schema-utils": "^2.5.0"
-      },
-      "dependencies": {
-        "schema-utils": {
-          "version": "2.6.4",
-          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-2.6.4.tgz",
-          "integrity": "sha512-VNjcaUxVnEeun6B2fiiUDjXXBtD4ZSH7pdbfIu1pOFwgptDPLMo/z9jr4sUfsjFVPqDCEin/F7IYlq7/E6yDbQ==",
-          "dev": true,
-          "requires": {
-            "ajv": "^6.10.2",
-            "ajv-keywords": "^3.4.1"
-          }
-        }
-      }
-    },
     "url-parse-lax": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
diff --git a/package.json b/package.json
index 386281f03..3e82348e3 100644
--- a/package.json
+++ b/package.json
@@ -24,12 +24,12 @@
     "url": "https://github.com/squidfunk/mkdocs-material.git"
   },
   "scripts": {
-    "build": "npx webpack --mode production",
+    "build": "npm run clean && npx webpack --mode production",
     "clean": "rm -rf material",
     "lint": "npm run lint:ts && npm run lint:scss",
     "lint:scss": "npx stylelint `find src/assets -name *.scss`",
     "lint:ts": "npx tslint -p tsconfig.json 'src/**/*.ts'",
-    "start": "npx webpack --mode development --watch"
+    "start": "npm run clean && npx webpack --mode development --watch"
   },
   "dependencies": {
     "clipboard": "^2.0.0",
diff --git a/src/assets/javascripts/actions/toc/anchor/index.ts b/src/assets/javascripts/actions/anchor/index.ts
similarity index 100%
rename from src/assets/javascripts/actions/toc/anchor/index.ts
rename to src/assets/javascripts/actions/anchor/index.ts
diff --git a/src/assets/javascripts/actions/index.ts b/src/assets/javascripts/actions/index.ts
index cff5b5085..196a57cf9 100644
--- a/src/assets/javascripts/actions/index.ts
+++ b/src/assets/javascripts/actions/index.ts
@@ -20,7 +20,7 @@
  * IN THE SOFTWARE.
  */
 
+export * from "./anchor"
 export * from "./header"
 export * from "./main"
 export * from "./search"
-export * from "./toc"
diff --git a/src/assets/javascripts/components/_/index.ts b/src/assets/javascripts/components/_/index.ts
index 06962242a..7b0a1a0ed 100644
--- a/src/assets/javascripts/components/_/index.ts
+++ b/src/assets/javascripts/components/_/index.ts
@@ -24,7 +24,7 @@ import { keys } from "ramda"
 import { NEVER, Observable, OperatorFunction, of, pipe } from "rxjs"
 import { map, scan, shareReplay, switchMap } from "rxjs/operators"
 
-import { getElement } from "utilities"
+import { getElement } from "observables"
 
 /* ----------------------------------------------------------------------------
  * Types
diff --git a/src/assets/javascripts/components/header/index.ts b/src/assets/javascripts/components/header/index.ts
index 2b8c2839a..f9b51db6a 100644
--- a/src/assets/javascripts/components/header/index.ts
+++ b/src/assets/javascripts/components/header/index.ts
@@ -20,6 +20,4 @@
  * IN THE SOFTWARE.
  */
 
-export * from "./_"
-export * from "./offset"
 export * from "./shadow"
diff --git a/src/assets/javascripts/components/header/offset/index.ts b/src/assets/javascripts/components/header/offset/index.ts
deleted file mode 100644
index cbc43ff74..000000000
--- a/src/assets/javascripts/components/header/offset/index.ts
+++ /dev/null
@@ -1,112 +0,0 @@
-/*
- * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-import { Observable, combineLatest } from "rxjs"
-import {
-  distinctUntilChanged,
-  map,
-  shareReplay,
-  switchMapTo
-} from "rxjs/operators"
-
-import { Agent, ViewportOffset } from "utilities"
-
-import { HeaderState } from "../_"
-
-/* ----------------------------------------------------------------------------
- * Helper types
- * ------------------------------------------------------------------------- */
-
-/**
- * Options
- */
-interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
-}
-
-/* ----------------------------------------------------------------------------
- * Functions
- * ------------------------------------------------------------------------- */
-
-/**
- * Watch viewport offset relative to an element's top
- *
- * This function returns an observable that computes the relative offset to the
- * top of the given element based on the current viewport offset.
- *
- * @param el - HTML element
- * @param agent - Agent
- * @param options - Options
- *
- * @return Viewport offset observable
- */
-export function watchViewportOffsetFromTopOf(
-  el: HTMLElement, { viewport }: Agent, { header$ }: Options
-): Observable<ViewportOffset> {
-
-  /* Compute necessary adjustment for offset */
-  const adjust$ = viewport.size$
-    .pipe(
-      switchMapTo(header$),
-      map(({ height }) => el.offsetTop - height),
-      distinctUntilChanged()
-    )
-
-  /* Compute relative offset and return as hot observable */
-  return combineLatest([viewport.offset$, adjust$])
-    .pipe(
-      map(([{ x, y }, adjust]) => ({ x, y: y - adjust })),
-      shareReplay(1)
-    )
-}
-
-/**
- * Watch viewport offset relative to an element's bottom
- *
- * This function returns an observable that computes the relative offset to the
- * bottom of the given element based on the current viewport offset.
- *
- * @param el - HTML element
- * @param agent - Agent
- * @param options - Options
- *
- * @return Viewport offset observable
- */
-export function watchViewportOffsetFromBottomOf(
-  el: HTMLElement, { viewport }: Agent, { header$ }: Options
-): Observable<ViewportOffset> {
-
-  /* Compute necessary adjustment for offset */
-  const adjust$ = viewport.size$
-    .pipe(
-      switchMapTo(header$),
-      map(({ height }) => el.offsetTop + el.offsetHeight - height),
-      distinctUntilChanged()
-    )
-
-  /* Compute relative offset and return as hot observable */
-  return combineLatest([viewport.offset$, adjust$])
-    .pipe(
-      map(([{ x, y }, adjust]) => ({ x, y: y - adjust })),
-      shareReplay(1)
-    )
-}
diff --git a/src/assets/javascripts/components/hero/index.ts b/src/assets/javascripts/components/hero/index.ts
index 4cdae3caf..99f065d70 100644
--- a/src/assets/javascripts/components/hero/index.ts
+++ b/src/assets/javascripts/components/hero/index.ts
@@ -21,12 +21,14 @@
  */
 
 import { Observable, OperatorFunction, pipe } from "rxjs"
-import { map, shareReplay } from "rxjs/operators"
+import { map, shareReplay, switchMap } from "rxjs/operators"
 
-import { switchMapIf } from "extensions"
-import { Agent, paintHidden } from "utilities"
-
-import { HeaderState, watchViewportOffsetFromTopOf } from "../header"
+import {
+  Header,
+  Viewport,
+  paintHideable,
+  watchViewportFrom
+} from "observables"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -47,7 +49,9 @@ export interface HeroState {
  * Options
  */
 interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
+  header$: Observable<Header>     /* Header observable */
+  viewport$: Observable<Viewport>
+  screen$: Observable<boolean>         /* Media screen observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -64,13 +68,13 @@ interface Options {
  * @return Hero state
  */
 export function watchHero(
-  el: HTMLElement, agent: Agent, { header$ }: Options
+  el: HTMLElement, options: Options
 ): Observable<HeroState> {
 
   /* Watch and paint visibility */
-  const hidden$ = watchViewportOffsetFromTopOf(el, agent, { header$ })
+  const hidden$ = watchViewportFrom(el, options)
     .pipe(
-      paintHidden(el, 20)
+      paintHideable(el, 20)
     )
 
   /* Combine into a single hot observable */
@@ -91,11 +95,10 @@ export function watchHero(
  * @return Operator function
  */
 export function mountHero(
-  agent: Agent, options: Options
+  options: Options
 ): OperatorFunction<HTMLElement, HeroState> {
-  const { media } = agent
   return pipe(
-    switchMapIf(media.screen$, el => watchHero(el, agent, options)),
+    switchMap(el => watchHero(el, options)),
     shareReplay(1)
   )
 }
diff --git a/src/assets/javascripts/components/index.ts b/src/assets/javascripts/components/index.ts
index 881ae9c61..8f4e6825b 100644
--- a/src/assets/javascripts/components/index.ts
+++ b/src/assets/javascripts/components/index.ts
@@ -23,8 +23,5 @@
 export * from "./_"
 export * from "./header"
 export * from "./hero"
-export * from "./navigation"
-export * from "./main"
-export * from "./search"
 export * from "./tabs"
 export * from "./toc"
diff --git a/src/assets/javascripts/components/tabs/index.ts b/src/assets/javascripts/components/tabs/index.ts
index b31bb382c..0e201e109 100644
--- a/src/assets/javascripts/components/tabs/index.ts
+++ b/src/assets/javascripts/components/tabs/index.ts
@@ -23,10 +23,13 @@
 import { Observable, OperatorFunction, pipe } from "rxjs"
 import { map, shareReplay } from "rxjs/operators"
 
-import { switchMapIf } from "extensions"
-import { Agent, paintHidden } from "utilities"
-
-import { HeaderState, watchViewportOffsetFromTopOf } from "../header"
+import {
+  Header,
+  Viewport,
+  paintHideable,
+  watchViewportFrom
+} from "observables"
+import { switchMapIf } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -47,7 +50,9 @@ export interface TabsState {
  * Options
  */
 interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
+  header$: Observable<Header>     /* Header state observable */
+  viewport$: Observable<Viewport>
+  screen$: Observable<boolean>         /* Media screen observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -61,19 +66,18 @@ interface Options {
  * the tabs, currently only denoting whether the tabs are hidden or not.
  *
  * @param el - Tabs element
- * @param agent - Agent
  * @param options - Options
  *
  * @return Tabs state
  */
 export function watchTabs(
-  el: HTMLElement, agent: Agent, { header$ }: Options
+  el: HTMLElement, options: Options
 ): Observable<TabsState> {
 
   /* Watch and paint visibility */
-  const hidden$ = watchViewportOffsetFromTopOf(el, agent, { header$ })
+  const hidden$ = watchViewportFrom(el, options)
     .pipe(
-      paintHidden(el, 8)
+      paintHideable(el, 8)
     )
 
   /* Combine into a single hot observable */
@@ -82,6 +86,7 @@ export function watchTabs(
       map(hidden => ({ hidden }))
     )
 }
+// TODO: generalize into watchHideable !!! or mountHideable...
 
 /* ------------------------------------------------------------------------- */
 
@@ -94,11 +99,10 @@ export function watchTabs(
  * @return Operator function
  */
 export function mountTabs(
-  agent: Agent, options: Options
+  options: Options
 ): OperatorFunction<HTMLElement, TabsState> {
-  const { media } = agent
   return pipe(
-    switchMapIf(media.screen$, el => watchTabs(el, agent, options)),
+    switchMapIf(options.screen$, el => watchTabs(el, options)),
     shareReplay(1)
   )
 }
diff --git a/src/assets/javascripts/components/toc/_/index.ts b/src/assets/javascripts/components/toc/_/index.ts
index c124d374e..476cc4a6b 100644
--- a/src/assets/javascripts/components/toc/_/index.ts
+++ b/src/assets/javascripts/components/toc/_/index.ts
@@ -23,21 +23,19 @@
 import { Observable, OperatorFunction, combineLatest, pipe } from "rxjs"
 import { map, shareReplay } from "rxjs/operators"
 
-import { switchMapIf } from "extensions"
-import { Agent, getElements } from "utilities"
-
-import { HeaderState } from "../../header"
-import {
-  MainState,
-  SidebarState,
-  paintSidebar,
-  watchSidebar
-} from "../../main"
 import {
   AnchorList,
+  Header,
+  Main,
+  Sidebar,
+  Viewport,
+  getElements,
   paintAnchorList,
-  watchAnchorList
-} from "../anchor"
+  paintSidebar,
+  watchAnchorList,
+  watchSidebar
+} from "observables"
+import { switchMapIf } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -47,7 +45,7 @@ import {
  * Table of contents state
  */
 export interface TableOfContentsState {
-  sidebar: SidebarState                /* Sidebar state */
+  sidebar: Sidebar                     /* Sidebar state */
   anchors: AnchorList                  /* Anchor list */
 }
 
@@ -59,8 +57,10 @@ export interface TableOfContentsState {
  * Options
  */
 interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
-  main$: Observable<MainState>         /* Main area state observable */
+  header$: Observable<Header>          /* Header observable */
+  main$: Observable<Main>              /* Main area observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
+  tablet$: Observable<boolean>         /* Media tablet observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -77,18 +77,18 @@ interface Options {
  * @return Table of contents state observable
  */
 export function watchTableOfContents(
-  el: HTMLElement, agent: Agent, { header$, main$ }: Options
+  el: HTMLElement, { header$, main$, viewport$ }: Options
 ): Observable<TableOfContentsState> {
 
   /* Watch and paint sidebar */
-  const sidebar$ = watchSidebar(el, agent, { main$ })
+  const sidebar$ = watchSidebar(el, { main$, viewport$ })
     .pipe(
       paintSidebar(el)
     )
 
   /* Watch and paint anchor list (scroll spy) */
   const els = getElements<HTMLAnchorElement>(".md-nav__link", el)
-  const anchors$ = watchAnchorList(els, agent, { header$ })
+  const anchors$ = watchAnchorList(els, { header$, viewport$ })
     .pipe(
       paintAnchorList(els)
     )
@@ -111,11 +111,10 @@ export function watchTableOfContents(
  * @return Operator function
  */
 export function mountTableOfContents(
-  agent: Agent, options: Options
+  options: Options
 ): OperatorFunction<HTMLElement, TableOfContentsState> {
-  const { media } = agent
   return pipe(
-    switchMapIf(media.tablet$, el => watchTableOfContents(el, agent, options)),
+    switchMapIf(options.tablet$, el => watchTableOfContents(el, options)),
     shareReplay(1)
   )
 }
diff --git a/src/assets/javascripts/components2/_/index.ts b/src/assets/javascripts/components2/_/index.ts
new file mode 100644
index 000000000..258f8c0ab
--- /dev/null
+++ b/src/assets/javascripts/components2/_/index.ts
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Component types
+ */
+export type ComponentType =
+  | "container"                        /* Container */
+  | "header"                           /* Header */
+  | "header-title"                     /* Header title */
+  | "hero"                             /* Hero */
+  | "main"                             /* Main area */
+  | "navigation"                       /* Navigation */
+  | "search"                           /* Search */
+  | "search-query"                     /* Search input */
+  | "search-reset"                     /* Search reset */
+  | "search-result"                    /* Search results */
+  | "tabs"                             /* Tabs */
+  | "toc"                              /* Table of contents */
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Component
+ *
+ * @template T - Data type
+ */
+export interface Component<T extends {}> {
+  type: ComponentType                  /* Component type */
+  data?: T                             /* Component data */
+}
diff --git a/src/assets/javascripts/components2/hideable/index.ts b/src/assets/javascripts/components2/hideable/index.ts
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/assets/javascripts/components2/navigation/index.ts b/src/assets/javascripts/components2/navigation/index.ts
new file mode 100644
index 000000000..efef2bd88
--- /dev/null
+++ b/src/assets/javascripts/components2/navigation/index.ts
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { Observable, OperatorFunction, of, pipe } from "rxjs"
+import { map, shareReplay, switchMap } from "rxjs/operators"
+
+import {
+  Main,
+  NavigationLayer,
+  Sidebar,
+  Viewport,
+  getElements,
+  paintNavigationLayer,
+  paintSidebar,
+  watchNavigationLayer,
+  watchSidebar
+} from "observables"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Navigation for breakpoint below screen
+ */
+export interface NavigationBelowScreen {
+  layer: NavigationLayer               /* Navigation layer */
+}
+
+/**
+ * Navigation for breakpoint above screen
+ */
+export interface NavigationAboveScreen {
+  sidebar: Sidebar                     /* Navigation sidebar */
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Navigation
+ */
+export type Navigation =
+  | NavigationBelowScreen
+  | NavigationAboveScreen
+
+/* ----------------------------------------------------------------------------
+ * Helper types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Options
+ */
+interface Options {
+  main$: Observable<Main>              /* Main area observable */
+  viewport$: Observable<Viewport>      /* Viewport offset observable */
+  screen$: Observable<boolean>         /* Screen media observable */
+}
+
+/* ----------------------------------------------------------------------------
+ * Helper functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount navigation below screen from source observable
+ *
+ * @param options - Options
+ *
+ * @return Operator function
+ */
+function mountNavigationBelowScreen(
+  _options: Options
+): OperatorFunction<HTMLElement, NavigationBelowScreen> {
+  return pipe(
+    map(el => getElements("nav", el)),
+    switchMap(els => watchNavigationLayer(els)
+      .pipe(
+        paintNavigationLayer(els),
+        map(layer => ({ layer }))
+      )
+    )
+  )
+}
+
+/**
+ * Mount navigation above screen from source observable
+ *
+ * @param options - Options
+ *
+ * @return Operator function
+ */
+function mountNavigationAboveScreen(
+  options: Options
+): OperatorFunction<HTMLElement, NavigationAboveScreen> {
+  return pipe(
+    switchMap(el => watchSidebar(el, options)
+      .pipe(
+        paintSidebar(el),
+        map(sidebar => ({ sidebar }))
+      )
+    )
+  )
+}
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount navigation from source observable
+ *
+ * @param options - Options
+ *
+ * @return Operator function
+ */
+export function mountNavigation(
+  options: Options
+): OperatorFunction<HTMLElement, Navigation> {
+  return pipe(
+    switchMap(el => options.screen$
+      .pipe(
+        switchMap(screen => screen
+          ? of(el).pipe(mountNavigationAboveScreen(options))
+          : of(el).pipe(mountNavigationBelowScreen(options))
+        )
+      )
+    ),
+    shareReplay(1)
+  )
+}
diff --git a/src/assets/javascripts/components/search/result/_/index.ts b/src/assets/javascripts/components2/search/index.ts
similarity index 64%
rename from src/assets/javascripts/components/search/result/_/index.ts
rename to src/assets/javascripts/components2/search/index.ts
index d568b0050..e4159bc0d 100644
--- a/src/assets/javascripts/components/search/result/_/index.ts
+++ b/src/assets/javascripts/components2/search/index.ts
@@ -31,10 +31,12 @@ import {
 } from "rxjs/operators"
 
 import { SearchResult } from "modules"
-import { Agent, watchElementOffset } from "utilities"
-
-import { paintSearchResultList } from "../list"
-import { paintSearchResultMeta } from "../meta"
+import {
+  SearchQuery,
+  Viewport,
+  paintSearchResult,
+  watchElementOffset
+} from "observables"
 
 /* ----------------------------------------------------------------------------
  * Helper types
@@ -44,59 +46,45 @@ import { paintSearchResultMeta } from "../meta"
  * Options
  */
 interface Options {
+  query$: Observable<SearchQuery>      /* Search query observable */
   result$: Observable<SearchResult[]>  /* Search result observable */
-  query$: Observable<string>           /* Search query observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
 
-/**
- * Watch search result
- *
- * @param el - Search result element
- * @param agent - Agent
- * @param options - Options
- *
- * @return Search result state observable
- */
-export function watchSearchResult(
-  el: HTMLElement, agent: Agent, { result$, query$ }: Options
-): Observable<SearchResult[]> {
-  const container = el.parentElement!
-
-  /* Compute whether there are more search results elements */
-  const render$ = watchElementOffset(container, agent)
-    .pipe(
-      map(({ y }) => y >= container.scrollHeight - container.offsetHeight - 16),
-      distinctUntilChanged(),
-      filter(identity)
-    )
-
-  /* Paint search results */
-  return result$
-    .pipe(
-      paintSearchResultMeta(el, { query$ }),
-      paintSearchResultList(el, { render$ })
-    )
-}
-
-/* ------------------------------------------------------------------------- */
-
 /**
  * Mount search result from source observable
  *
- * @param agent - Agent
  * @param options - Options
  *
  * @return Operator function
  */
 export function mountSearchResult(
-  agent: Agent, options: Options
+  { query$, result$, viewport$ }: Options
 ): OperatorFunction<HTMLElement, SearchResult[]> {
   return pipe(
-    switchMap(el => watchSearchResult(el, agent, options)),
+    switchMap(el => {
+      const container = el.parentElement!
+
+      /* Compute whether there are more search results to fetch */
+      const fetch$ = watchElementOffset(container, { viewport$ })
+        .pipe(
+          map(({ y }) => {
+            return y >= container.scrollHeight - container.offsetHeight - 16
+          }),
+          distinctUntilChanged(),
+          filter(identity)
+        )
+
+      /* Paint search results */
+      return result$
+        .pipe(
+          paintSearchResult(el, { query$, fetch$ })
+        )
+    }),
     shareReplay(1)
   )
 }
diff --git a/src/assets/javascripts/components2/toc/index.ts b/src/assets/javascripts/components2/toc/index.ts
new file mode 100644
index 000000000..9aba86980
--- /dev/null
+++ b/src/assets/javascripts/components2/toc/index.ts
@@ -0,0 +1,128 @@
+// /*
+//  * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+//  *
+//  * Permission is hereby granted, free of charge, to any person obtaining a copy
+//  * of this software and associated documentation files (the "Software"), to
+//  * deal in the Software without restriction, including without limitation the
+//  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+//  * sell copies of the Software, and to permit persons to whom the Software is
+//  * furnished to do so, subject to the following conditions:
+//  *
+//  * The above copyright notice and this permission notice shall be included in
+//  * all copies or substantial portions of the Software.
+//  *
+//  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+//  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+//  * IN THE SOFTWARE.
+//  */
+
+// import { Observable, OperatorFunction, combineLatest, pipe } from "rxjs"
+// import { map, shareReplay, switchMap } from "rxjs/operators"
+
+// import { switchMapIf } from "extensions"
+// import { Agent, getElements } from "utilities"
+
+// import { HeaderState } from "../../header"
+// import {
+//   MainState,
+//   SidebarState,
+//   paintSidebar,
+//   watchSidebar
+// } from "../../main"
+// import {
+//   AnchorList,
+//   paintAnchorList,
+//   watchAnchorList
+// } from "../anchor"
+
+// /* ----------------------------------------------------------------------------
+//  * Types
+//  * ------------------------------------------------------------------------- */
+
+// /**
+//  * Table of contents
+//  */
+// export interface TableOfContents {
+//   sidebar: SidebarState                /* Sidebar state */
+//   anchors: AnchorList                  /* Anchor list */
+// }
+
+// /* ----------------------------------------------------------------------------
+//  * Helper types
+//  * ------------------------------------------------------------------------- */
+
+// /**
+//  * Options
+//  */
+// interface Options {
+//   header$: Observable<Header>          /* Header observable */
+//   main$: Observable<Main>              /* Main area observable */
+// }
+
+// /* ----------------------------------------------------------------------------
+//  * Functions
+//  * ------------------------------------------------------------------------- */
+
+// /**
+//  * Watch table of contents
+//  *
+//  * @param el - Table of contents element
+//  * @param agent - Agent
+//  * @param options - Options
+//  *
+//  * @return Table of contents observable
+//  */
+// export function watchTableOfContents(
+//   el: HTMLElement, agent: Agent, { header$, main$ }: Options
+// ): Observable<TableOfContents> {
+
+//   /* Watch and paint sidebar */
+//   const sidebar$ = watchSidebar(el, agent, { main$ })
+//     .pipe(
+//       paintSidebar(el)
+//     )
+
+//   /* Watch and paint anchor list (scroll spy) */
+//   const els = getElements<HTMLAnchorElement>(".md-nav__link", el)
+//   const anchors$ = watchAnchorList(els, agent, { header$ })
+//     .pipe(
+//       paintAnchorList(els)
+//     )
+
+//   /* Combine into a single hot observable */
+//   return combineLatest([sidebar$, anchors$])
+//     .pipe(
+//       map(([sidebar, anchors]) => ({ sidebar, anchors }))
+//     )
+// }
+
+// /* ------------------------------------------------------------------------- */
+
+// /**
+//  * Mount table of contents from source observable
+//  *
+//  * @param agent - Agent
+//  * @param options - Options
+//  *
+//  * @return Operator function
+//  */
+// export function mountTableOfContents(
+//   agent: Agent, options: Options
+// ): OperatorFunction<HTMLElement, TableOfContents> {
+//   const { media } = agent
+//   return pipe(
+//     switchMap(el => media.tablet$
+//       .pipe(
+//         switchMap(tablet => {
+//           return watchTableOfContents(el, agent, options)
+//         })
+//       )
+//     ),
+//     switchMapIf(media.tablet$, el => watchTableOfContents(el, agent, options)),
+//     shareReplay(1)
+//   )
+// }
diff --git a/src/assets/javascripts/extensions/index.ts b/src/assets/javascripts/extensions/index.ts
deleted file mode 100644
index 5542f9ff5..000000000
--- a/src/assets/javascripts/extensions/index.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-export * from "./jsx"
-export * from "./rxjs"
diff --git a/src/assets/javascripts/index.ts b/src/assets/javascripts/index.ts
index 9a9976474..0099f2837 100644
--- a/src/assets/javascripts/index.ts
+++ b/src/assets/javascripts/index.ts
@@ -31,15 +31,12 @@ import { identity, values } from "ramda"
 import {
   EMPTY,
   Observable,
-  Subject,
-  forkJoin,
   merge,
   of,
   fromEvent,
-  interval,
-  NEVER
+  OperatorFunction,
+  pipe
 } from "rxjs"
-import { ajax } from "rxjs/ajax"
 import {
   delay,
   filter,
@@ -47,53 +44,46 @@ import {
   pluck,
   switchMap,
   switchMapTo,
-  take,
   tap,
-  withLatestFrom,
-  distinctUntilChanged,
   distinctUntilKeyChanged,
+  shareReplay
 } from "rxjs/operators"
 
 import {
   Component,
   paintHeaderShadow,
   mountHero,
-  mountMain,
-  mountNavigation,
-  mountSearchResult,
   mountTableOfContents,
   mountTabs,
   switchComponent,
   watchComponentMap,
+} from "./components"
+import {
   watchHeader,
   watchSearchQuery,
-  watchSearchReset
-} from "./components"
-import { SearchIndexOptions } from "./modules"
-import {
+  watchSearchReset,
   getElement,
-  setupAgent,
   watchToggle,
-  watchWorker,
   setToggle,
   getElements,
   watchMedia,
-  translate,
-  watchElementFocus
-} from "./utilities"
+  watchDocument,
+  watchLocationHash,
+  watchMain,
+  watchViewport,
+  watchKeyboard
+} from "./observables"
 import {
-  PackerMessage,
-  PackerMessageType,
-  SearchMessage,
-  SearchMessageType,
-  SearchSetupMessage,
-  isSearchDumpMessage,
-  isSearchResultMessage
+  isSearchResultMessage,
+  setupSearchWorker
 } from "./workers"
 import { renderSource } from "templates"
-import { switchMapIf, not, takeIf } from "extensions"
+import { not, takeIf } from "utilities"
 import { renderClipboard } from "templates/clipboard"
-import { watchActiveLayer, paintActiveLayer } from "components/navigation/layer"
+import { fetchGitHubStats } from "modules/source/github"
+import { mountNavigation } from "components2/navigation"
+import { mountSearchResult } from "components2/search"
+import { renderTable } from "templates/table"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -117,6 +107,10 @@ export interface Config {
 document.documentElement.classList.remove("no-js")
 document.documentElement.classList.add("js")
 
+/* Test for iOS */
+if (navigator.userAgent.match(/(iPad|iPhone|iPod)/g))
+  document.documentElement.classList.add("ios")
+
 const names: Component[] = [
   "container",                       /* Container */
   "header",                          /* Header */
@@ -154,106 +148,6 @@ function isConfig(config: any): config is Config {
       && typeof config.worker.packer === "string"
 }
 
-/**
-  *
-  * Rogue control characters must be filtered before handing the query to the
-  * search index, as lunr will throw otherwise.
- */
-function prepare(value: string): string {
-  const newvalue = value
-    .replace(/(?:^|\s+)[*+-:^~]+(?=\s+|$)/g, "")
-    .trim()
-
-  return newvalue ? newvalue.replace(/\s+|$/g, "* ") : ""
-}
-
-function setupWorkers(config: Config) {
-  // Remove trailing URL, or search might not work on the 404 page.
-  config.base = config.base.replace(/\/$/, "")
-
-  const worker = new Worker(config.worker.search)
-  const packer = new Worker(config.worker.packer)
-
-  const packerMessage$ = new Subject<PackerMessage>()
-  const packer$ = watchWorker(packer, { send$: packerMessage$ })
-
-  // send a message, then switchMapTo worker!
-
-  packer$.subscribe(message => {
-    // console.log("PACKER.MSG", message.data.length)
-    // is always packed!
-    if (message.type === PackerMessageType.BINARY && message.data[0] !== "{")
-      localStorage.setItem("index", message.data)
-  })
-
-  // storing = experimental feature
-
-  const searchMessage$ = new Subject<SearchMessage>()
-
-  const search$ = watchWorker(worker, { send$: searchMessage$ })
-
-  /* Link search to packer */
-  search$
-    .pipe(
-      filter(isSearchDumpMessage),
-      map(message => ({
-        type: PackerMessageType.STRING,
-        data: message.data
-      })),
-      tap(message => packerMessage$.next(message))  // send message and wait!
-      // switchMapTo(packer$)
-    )
-      .subscribe()
-
-  const data$ = ajax({
-    url: `${config.base}/search/search_index.json`,
-    responseType: "json",
-    withCredentials: true
-  })
-    .pipe<SearchIndexOptions>(
-      pluck("response"),
-      // map(res => {
-      //   // search language... default for theme language...
-      //   const override = translate("search.tokenizer")
-      //   // TODO: ???
-      //   if (override.length)
-      //     res.config.separator = override
-
-      //   return res
-      // })
-      // take(1)
-    )
-
-  const fromLocal = localStorage.getItem("index")
-
-  ;
-  (fromLocal ? of({
-    type: PackerMessageType.BINARY,
-    data: localStorage.getItem("index")!
-  }) : EMPTY)
-    .subscribe(x => {
-      // console.log("send message to packer")
-      packerMessage$.next(x)
-    })
-
-  const index$ = fromLocal ? packer$.pipe(pluck("data"), take(1)) : of(undefined) // of(localStorage.getItem("index"))
-
-  // index$.subscribe(xx => console.log("INDEX", xx))
-
-  forkJoin([data$, index$])
-    .pipe<SearchSetupMessage>(
-      map(([data, index]) => ({
-        type: SearchMessageType.SETUP,
-        data: { ...data, index }
-      }))
-    )
-      .subscribe(message => {
-        searchMessage$.next(message) // TODO: this shall not complete
-      })
-
-  return [search$, searchMessage$] as const
-}
-
 /**
  * Yes, this is a super hacky implementation. Needs clean up.
  */
@@ -279,42 +173,29 @@ function repository() {
   // github repository...
   const [, user, repo] = el.href.match(/^.+github\.com\/([^\/]+)\/?([^\/]+)?.*$/i)
 
+  // storage memoization!?
+  // get, if not available, exec and persist
+
+  // getOrRetrieve... storage$.
+
   // Show repo stats
   if (user && repo) {
-    return ajax({
-      url: `https://api.github.com/repos/${user}/${repo}`,
-      responseType: "json"
-    })
+    return fetchGitHubStats(user, repo)
       .pipe(
-        map(({ status, response }) => {
-          if (status === 200) {
-            const { stargazers_count, forks_count } = response
-            return [
-              `${format(stargazers_count)} Stars`,
-              `${format(forks_count)} Forks`
-            ]
-          }
-          return []
-        }),
+        map(({ stargazers_count, forks_count }) => ([
+          `${format(stargazers_count || 0)} Stars`,
+          `${format(forks_count || 0)} Forks`
+        ])),
         tap(data => sessionStorage.setItem("repository", JSON.stringify(data)))
       )
 
   // Show user or organization stats
   } else if (user) {
-    return ajax({
-      url: `https://api.github.com/users/${user}`,
-      responseType: "json"
-    })
+    return fetchGitHubStats(user)
       .pipe(
-        map(({ status, response }) => {
-          if (status === 200) {
-            const { public_repos } = response
-            return [
-              `${format(public_repos)} Repositories`
-            ]
-          }
-          return []
-        }),
+        map(({ public_repos }) => ([
+          `${format(public_repos || 0)} Repositories`
+        ])),
         tap(data => sessionStorage.setItem("repository", JSON.stringify(data)))
       )
   }
@@ -334,14 +215,6 @@ export function initialize(config: unknown) {
   if (!isConfig(config))
     throw new SyntaxError(`Invalid configuration: ${JSON.stringify(config)}`)
 
-  // pass config here!?
-  const agent = setupAgent() // TODO: add a config parameter here to configure media queries
-
-  const [
-    searchWorkerRecv$,
-    searchMessage$
-  ] = setupWorkers(config)
-
   // TODO: WIP repo rendering
   repository().subscribe(facts => {
     if (facts.length) {
@@ -355,10 +228,17 @@ export function initialize(config: unknown) {
     }
   })
 
+  // pass config here!?
+  const document$ = watchDocument()
+  const hash$ = watchLocationHash()
+  const viewport$ = watchViewport()
+  const screen$ = watchMedia("(min-width: 960px)")
+  const tablet$ = watchMedia("(min-width: 1220px)")
+
   /* ----------------------------------------------------------------------- */
 
   /* Create component map observable */
-  const components$ = watchComponentMap(names, { document$: agent.document.load$ })
+  const components$ = watchComponentMap(names, { document$ })
   const component = <T extends HTMLElement>(name: Component): Observable<T> => {
     return components$
       .pipe(
@@ -383,120 +263,104 @@ export function initialize(config: unknown) {
     )
       .subscribe()
 
-  // ----------------------------------------------------------------------------
-
-  // watchSearchResult // emit, if at bottom...
-  // receive results as a second observable!? filter stuff, paint
-
-  const result$ = searchWorkerRecv$ // move worker initialization into mountSearch ?
-    .pipe(
-      // tap(m => console.log("message from worker", m)),
-      filter(isSearchResultMessage),
-      pluck("data"),
-      // Prefix URLs with base URL
-      tap(result => result.forEach(item => {
-        item.article.location = `${config.base}/${item.article.location}`
-        item.sections.forEach(section => {
-          section.location = `${config.base}/${section.location}`
-        })
-      }))
-    )
-
-  // handleSearchResult <-- operator
-
-  const query$ = component<HTMLInputElement>("search-query")
-    .pipe(
-      switchMap(el => watchSearchQuery(el, { prepare }))
-    )
-
-  query$
-    .pipe<SearchMessage>(
-      map(query => ({ // put this into some function...
-        type: SearchMessageType.QUERY,
-        data: query.value
-      })), // TODO. ugly...
-      distinctUntilKeyChanged("data")
-      // distinctUntilKeyChanged("data")
-    )
-      .subscribe(searchMessage$)
-
-  // create the message subject internally... and link it to the worker...?
-  // watchSearchWorker(worker, agent, { query$ }) // message internally...
-
-  query$
-    .pipe(
-      tap(query => {
-        if (query.focus)
-          setToggle(search, true)
-      })
-    )
-      .subscribe()
-
-  /* ----------------------------------------------------------------------- */
-
+  // DONE
   const main$ = component("main")
     .pipe(
-      mountMain(agent, { header$ })
-    )
-
-  const navigation$ = component("navigation")
-    .pipe(
-      mountNavigation(agent, { main$ })
-    )
-
-  const toc$ = component("toc")
-    .pipe(
-      mountTableOfContents(agent, { header$, main$ })
-    )
-
-  // TODO: naming?
-  const resultComponent$ = component("search-result")
-    .pipe(
-      mountSearchResult(agent, { result$, query$: query$.pipe(
-        distinctUntilKeyChanged("value"),
-        pluck("value")
-      ) })
-    ) // temporary fix
-
-  const tabs$ = component("tabs")
-    .pipe(
-      mountTabs(agent, { header$ })
-    )
-
-  const hero$ = component("hero")
-    .pipe(
-      mountHero(agent, { header$ })
+      switchMap(el => watchMain(el, { header$, viewport$ })),
+      shareReplay(1) // TODO: mount!?
     )
 
+  // ---------------------------------------------------------------------------
 
   /* ----------------------------------------------------------------------- */
 
   const drawer = getElement<HTMLInputElement>("[data-md-toggle=drawer]")!
-  const search = getElement<HTMLInputElement>("[data-md-toggle=search]")!
 
+  /* ----------------------------------------------------------------------- */
+
+  // build a single search observable???
+
+  const query$ = component<HTMLInputElement>("search-query")
+    .pipe(
+      switchMap(el => watchSearchQuery(el))
+    )
+
+  const sw = setupSearchWorker(config.worker.search, {
+    base: config.base,
+    query$
+  })
+
+  const result$ = sw.rx$ // move worker initialization into mountSearch ?
+    .pipe(
+      filter(isSearchResultMessage),
+      pluck("data")
+    )
+
+  const search = getElement<HTMLInputElement>("[data-md-toggle=search]")!
   const searchActive$ = watchToggle(search)
     .pipe(
       delay(400)
     )
 
+  query$
+    .pipe(
+      distinctUntilKeyChanged("focus"),
+      tap(query => {
+        if (query.focus)
+          setToggle(search, query.focus) // paintSearchQuery?
+        // console.log(query)
+      })
+    )
+      .subscribe()
+
+  // implement toggle function that returns the toggles as observable...
   const reset$ = component("search-reset")
     .pipe(
       switchMap(watchSearchReset)
     )
 
-  const key$ = fromEvent<KeyboardEvent>(window, "keydown").pipe(
-    filter(ev => !(ev.metaKey || ev.ctrlKey))
-  )
+  /* ----------------------------------------------------------------------- */
 
-  // filter arrow keys if search is active!
-  searchActive$.subscribe(console.log)
+  // DONE (partly)
+  const navigation$ = component("navigation")
+    .pipe(
+      mountNavigation({ main$, viewport$, screen$ })
+    )
+
+  const toc$ = component("toc")
+    .pipe(
+      mountTableOfContents({ header$, main$, viewport$, tablet$ })
+    )
+
+  // TODO: naming?
+  const resultComponent$ = component("search-result")
+    .pipe(
+      mountSearchResult({ viewport$, result$, query$: query$.pipe(
+        distinctUntilKeyChanged("value"),
+      ) })
+    ) // temporary fix
+
+  // mount hideable...
+
+  const tabs$ = component("tabs")
+    .pipe(
+      mountTabs({ header$, viewport$, screen$ })
+    )
+
+  const hero$ = component("hero")
+    .pipe(
+      mountHero({ header$, viewport$, screen$ })
+    )
+
+  // function watchKeyboard
+  const key$ = watchKeyboard()
 
   // shortcodes
   key$
     .pipe(
       takeIf(not(searchActive$))
     )
-      .subscribe(ev => {
+      .subscribe(key => {
         if (
           document.activeElement && (
             ["TEXTAREA", "SELECT", "INPUT"].includes(
@@ -508,7 +372,7 @@ export function initialize(config: unknown) {
         ) {
           // do nothing...
         } else {
-          if (ev.keyCode === 70 || ev.keyCode === 83) {
+          if (key.type === "KeyS" || key.type === "KeyF") {
             setToggle(search, true)
           }
         }
@@ -520,27 +384,27 @@ export function initialize(config: unknown) {
       takeIf(searchActive$),
 
       /* Abort if meta key (macOS) or ctrl key (Windows) is pressed */
-      tap(ev => {
-        if (ev.key === "Enter") {
+      tap(key => {
+        console.log("jo", key)
+        if (key.type === "Enter") {
           if (document.activeElement === getElement("[data-md-component=search-query]")) {
-            ev.preventDefault()
+            key.claim()
             // intercept hash change after search closed
           } else {
             setToggle(search, false)
           }
         }
 
-        if (ev.key === "ArrowUp" || ev.key === "ArrowDown") {
+        if (key.type === "ArrowUp" || key.type === "ArrowDown") {
           const active = getElements("[data-md-component=search-query], [data-md-component=search-result] [href]")
           const i = Math.max(0, active.findIndex(el => el === document.activeElement))
-          const x = Math.max(0, (i + active.length + (ev.keyCode === 38 ? -1 : +1)) % active.length)
+          const x = Math.max(0, (i + active.length + (key.type === "ArrowUp" ? -1 : +1)) % active.length)
           active[x].focus()
 
           /* Prevent scrolling of page */
-          ev.preventDefault()
-          ev.stopPropagation()
+          key.claim()
 
-        } else if (ev.key === "Escape" || ev.key === "Tab") {
+        } else if (key.type === "Escape" || key.type === "Tab") {
           setToggle(search, false)
           getElement("[data-md-component=search-query]")!.blur()
 
@@ -564,6 +428,8 @@ export function initialize(config: unknown) {
     )
       .subscribe()
 
+      // focusable -> setFocus(true, false)
+
   /* ----------------------------------------------------------------------- */
 
   /* Open details before printing */
@@ -579,50 +445,109 @@ export function initialize(config: unknown) {
     })
 
   // Close drawer and search on hash change
-  agent.location.hash$.subscribe(() => {
+  hash$.subscribe(() => {
     setToggle(drawer, false)
     setToggle(search, false) // we probably need to delay the anchor jump for search
   })
 
   /* ----------------------------------------------------------------------- */
 
-  /* Clipboard integration */
+  /* Clipboard.js integration */
   if (Clipboard.isSupported()) {
-    const blocks = getElements(".codehilite > pre, .highlight> pre, pre > code")
-    Array.prototype.forEach.call(blocks, (block, index) => {
-      const id = `__code_${index}`
-
-      /* Create button with message container */
-      const button = renderClipboard(id)
-
-      /* Link to block and insert button */
-      const parent = block.parentNode
-      parent.id = id
-      parent.insertBefore(button, block)
-    })
+    const blocks = getElements("pre > code")
+    for (const [index, block] of blocks.entries()) {
+      const parent = block.parentElement!
+      parent.id = `__code_${index}`
+      parent.insertBefore(renderClipboard(parent.id), block)
+    }
 
     /* Initialize Clipboard listener */
-    const copy = new Clipboard(".md-clipboard")
+    const copy = new Clipboard(".md-clipboard") // create observable...
 
     /* Success handler */
-    copy.on("success", action => {
-      alert("Copied to clipboard") // TODO: integrate snackbar
-      // TODO: add a snackbar/notification
+    // copy.on("success", action => {
+    //   alert("Copied to clipboard") // TODO: integrate snackbar
+    //   // TODO: add a snackbar/notification
 
-    })
+    // })
   }
 
+  /* Wrap all data tables for better overflow scrolling */
+  const tables = getElements<HTMLTableElement>("table:not([class])")
+  const placeholder = document.createElement("table")
+  tables.forEach(table => {
+    table.replaceWith(placeholder)
+    placeholder.replaceWith(renderTable(table))
+  })
+
+  // search lock
+  let lastOffset = 0
+  tablet$.pipe(
+    switchMap(active => {
+      return !active ? watchToggle(search) : EMPTY
+    }),
+    switchMap(toggle => {
+      if (toggle) {
+        console.log("ACTIVE")
+        return of(document.body)
+          .pipe(
+            tap(() => lastOffset = window.pageYOffset),
+            delay(400),
+            tap(() => {
+              window.scrollTo(0, 0),
+              console.log("scrolled... to top, locked body")
+              document.body.dataset.mdState = "lock"
+            })
+          )
+      } else {
+        console.log("INACTIVE")
+        return of(document.body)
+          .pipe(
+            tap(() => document.body.dataset.mdState = ""),
+            delay(100),
+            tap(() => {
+              window.scrollTo(0, lastOffset)
+            })
+          )
+      }
+      return EMPTY
+    })
+  )
+    .subscribe(x => console.log("SEARCHLOCK", x))
+
   /* ----------------------------------------------------------------------- */
 
-  const navigationlayer$ = component("navigation")
-    .pipe(
-      switchMapIf(not(agent.media.tablet$), el => watchActiveLayer(el)
-        .pipe(
-          paintActiveLayer()
-        )
-      )
-    )
-      .subscribe(console.log)
+  // get headerHEIGHT! only if header is sticky!
+
+  // // lockHeader at...
+  // const direction$ = agent.viewport.offset$.pipe(
+  //   bufferCount(2, 1), // determine scroll direction
+  //   map(([{ y: y0 }, { y: y1 }]) => y1 > y0),
+  //   distinctUntilChanged(),
+  // )
+
+  // document.body.style.minHeight = "100vh"
+
+  // // if true => then + HEADER. otherwise not
+  // let last = 0
+  // combineLatest([direction$, header$]).pipe(
+  //   tap(([direction, { height }]) => { // TODO: only if sticky!
+  //     const offset = 48
+  //     console.log(window.pageYOffset, height, last)
+  //     if (Math.abs(window.pageYOffset - last) < height + offset) { // TODO: add sensitivity offset!
+  //       return
+  //     }
+  //     if (direction) {
+  //       document.body.style.height = `${window.pageYOffset + offset + height}px`
+  //     } else {
+  //       document.body.style.height = `${window.pageYOffset - offset}px` // offset
+  //     }
+  //     last = window.pageYOffset
+  //   })
+  // )
+  //   .subscribe()
+
+  // // toiggle
 
   /* ----------------------------------------------------------------------- */
 
@@ -644,7 +569,15 @@ export function initialize(config: unknown) {
     .subscribe() // potential memleak <-- use takeUntil
 
   return {
-    agent,
+    // agent,
     state
   }
 }
+
+// function mountSearchQuery(
+
+// ): OperatorFunction<HTMLInputElement, SearchQuery> {
+//   return pipe(
+//     switchMap(el => watchSearchQuery(el))
+//   )
+// }
diff --git a/src/assets/javascripts/modules/search/document/index.ts b/src/assets/javascripts/modules/search/document/index.ts
index c56173225..b9c40fabb 100644
--- a/src/assets/javascripts/modules/search/document/index.ts
+++ b/src/assets/javascripts/modules/search/document/index.ts
@@ -95,12 +95,22 @@ export function setupSearchDocumentMap(
 
       /* Add subsequent section */
       } else {
-        documents.set(location, { location, title, text, parent })
+        documents.set(location, {
+          location,
+          title,
+          text,
+          parent
+        })
       }
 
     /* Add article */
     } else {
-      documents.set(location, { location, title, text, linked: false })
+      documents.set(location, {
+        location,
+        title,
+        text,
+        linked: false
+      })
     }
   }
   return documents
diff --git a/src/assets/javascripts/modules/source/github/index.ts b/src/assets/javascripts/modules/source/github/index.ts
new file mode 100644
index 000000000..5965e2866
--- /dev/null
+++ b/src/assets/javascripts/modules/source/github/index.ts
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { Repo, User } from "github-types"
+import { NEVER, Observable } from "rxjs"
+import { ajax } from "rxjs/ajax"
+import { filter, map, pluck, shareReplay } from "rxjs/operators"
+
+/* ----------------------------------------------------------------------------
+ * Helper functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Round a number
+ *
+ * TODO: document
+ */
+function round(value: number) {
+  return value > 999
+    ? `${(value / 1000).toFixed(1)}k`
+    : `${(value)}`
+}
+
+/**
+ * TODO: document
+ */
+export function fetchGitHubStats(
+  user: string
+): Observable<User>
+export function fetchGitHubStats(
+  user: string, repo: string
+): Observable<Repo>
+export function fetchGitHubStats(
+  user: string, repo?: string
+): Observable<User | Repo> {
+  const endpoint = typeof repo !== "undefined"
+    ? `repos/${user}/${repo}`
+    : `users/${user}`
+  return ajax({
+    url: `https://api.github.com/${endpoint}`,
+    responseType: "json"
+  })
+    .pipe(
+      filter(({ status }) => status === 200),
+      pluck("response"),
+      shareReplay(1)
+    )
+}
+
+// TODO: GitLab API:
+// https://docs.gitlab.com/ee/api/projects.html#get-single-project
+// curl "https://gitlab.com/api/v4/projects/johannes-z%2Fmkdocs-material"
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Get repository information
+ *
+ * TODO: document
+ */
+export function getRepository(user: string, repo: string): Observable<string[]> {
+  return fetchGitHubStats(user, repo)
+    .pipe(
+      map(({ stargazers_count, forks_count }) => ([
+        `${round(stargazers_count || 0)} Stars`,
+        `${round(forks_count || 0)} Forks`
+      ]))
+    )
+}
+
+/**
+ * Get user/organization information
+ *
+ * TODO: document
+ */
+export function getUser(user: string): Observable<string[]> {
+  return fetchGitHubStats(user)
+    .pipe(
+      map(({ public_repos }) => ([
+        `${round(public_repos || 0)} Repositories`
+      ]))
+    )
+}
diff --git a/src/assets/javascripts/utilities/agent/document/index.ts b/src/assets/javascripts/observables/agent/document/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/document/index.ts
rename to src/assets/javascripts/observables/agent/document/index.ts
diff --git a/src/assets/javascripts/utilities/agent/element/_/index.ts b/src/assets/javascripts/observables/agent/element/_/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/element/_/index.ts
rename to src/assets/javascripts/observables/agent/element/_/index.ts
diff --git a/src/assets/javascripts/utilities/agent/element/focus/index.ts b/src/assets/javascripts/observables/agent/element/focus/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/element/focus/index.ts
rename to src/assets/javascripts/observables/agent/element/focus/index.ts
diff --git a/src/assets/javascripts/utilities/agent/element/index.ts b/src/assets/javascripts/observables/agent/element/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/element/index.ts
rename to src/assets/javascripts/observables/agent/element/index.ts
diff --git a/src/assets/javascripts/utilities/agent/element/offset/index.ts b/src/assets/javascripts/observables/agent/element/offset/index.ts
similarity index 85%
rename from src/assets/javascripts/utilities/agent/element/offset/index.ts
rename to src/assets/javascripts/observables/agent/element/offset/index.ts
index 4e908dfe5..338475046 100644
--- a/src/assets/javascripts/utilities/agent/element/offset/index.ts
+++ b/src/assets/javascripts/observables/agent/element/offset/index.ts
@@ -21,10 +21,14 @@
  */
 
 import { Observable, fromEvent, merge } from "rxjs"
-import { map, shareReplay, startWith } from "rxjs/operators"
+import {
+  distinctUntilKeyChanged,
+  map,
+  shareReplay,
+  startWith
+} from "rxjs/operators"
 
-import { Agent } from "../../_"
-import { ViewportSize } from "../../viewport"
+import { Viewport } from "../../viewport"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -46,7 +50,7 @@ export interface ElementOffset {
  * Options
  */
 interface Options {
-  size$: Observable<ViewportSize>      /* Viewport size observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -56,7 +60,7 @@ interface Options {
 /**
  * Retrieve element offset
  *
- * @param el - HTML element
+ * @param el - Element
  *
  * @return Element offset
  */
@@ -73,15 +77,21 @@ export function getElementOffset(el: HTMLElement): ElementOffset {
  * Watch element offset
  *
  * @param el - Element
- * @param agent - Agent
+ * @param options - Options
  *
  * @return Element offset observable
  */
 export function watchElementOffset(
-  el: HTMLElement, { viewport }: Agent
+  el: HTMLElement, { viewport$ }: Options
 ): Observable<ElementOffset> {
   const scroll$ = fromEvent(el, "scroll")
-  return merge(scroll$, viewport.size$)
+  const size$ = viewport$
+    .pipe(
+      distinctUntilKeyChanged("size")
+    )
+
+  /* Merge into a single hot observable */
+  return merge(scroll$, size$)
     .pipe(
       map(() => getElementOffset(el)),
       startWith(getElementOffset(el)),
diff --git a/src/assets/javascripts/utilities/agent/index.ts b/src/assets/javascripts/observables/agent/index.ts
similarity index 97%
rename from src/assets/javascripts/utilities/agent/index.ts
rename to src/assets/javascripts/observables/agent/index.ts
index 5637ca2a0..380cf2aff 100644
--- a/src/assets/javascripts/utilities/agent/index.ts
+++ b/src/assets/javascripts/observables/agent/index.ts
@@ -20,9 +20,9 @@
  * IN THE SOFTWARE.
  */
 
-export * from "./_"
 export * from "./document"
 export * from "./element"
+export * from "./keyboard"
 export * from "./location"
 export * from "./media"
 export * from "./viewport"
diff --git a/src/assets/javascripts/observables/agent/keyboard/index.ts b/src/assets/javascripts/observables/agent/keyboard/index.ts
new file mode 100644
index 000000000..f185ccee9
--- /dev/null
+++ b/src/assets/javascripts/observables/agent/keyboard/index.ts
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { Observable, fromEvent } from "rxjs"
+import { filter, map, share } from "rxjs/operators"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Key
+ */
+export interface Key {
+  type: string                         /* Key type */
+  claim(): void                        /* Key claim */
+}
+
+/* ----------------------------------------------------------------------------
+ * Data
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Observable for window keyboard events
+ */
+const keydown$ = fromEvent<KeyboardEvent>(window, "keydown")
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Watch keyboard
+ *
+ * @return Keyboard observable
+ */
+export function watchKeyboard(): Observable<Key> {
+  return keydown$
+    .pipe(
+      filter(ev => !(ev.shiftKey || ev.metaKey || ev.ctrlKey)),
+      map(ev => ({
+        type: ev.code,
+        claim() {
+          ev.preventDefault()
+          ev.stopPropagation()
+        }
+      })),
+      share()
+    )
+}
diff --git a/src/assets/javascripts/utilities/agent/location/index.ts b/src/assets/javascripts/observables/agent/location/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/location/index.ts
rename to src/assets/javascripts/observables/agent/location/index.ts
diff --git a/src/assets/javascripts/utilities/agent/media/index.ts b/src/assets/javascripts/observables/agent/media/index.ts
similarity index 100%
rename from src/assets/javascripts/utilities/agent/media/index.ts
rename to src/assets/javascripts/observables/agent/media/index.ts
diff --git a/src/assets/javascripts/utilities/agent/viewport/index.ts b/src/assets/javascripts/observables/agent/viewport/_/index.ts
similarity index 84%
rename from src/assets/javascripts/utilities/agent/viewport/index.ts
rename to src/assets/javascripts/observables/agent/viewport/_/index.ts
index 06ace293a..8279131e3 100644
--- a/src/assets/javascripts/utilities/agent/viewport/index.ts
+++ b/src/assets/javascripts/observables/agent/viewport/_/index.ts
@@ -20,23 +20,9 @@
  * IN THE SOFTWARE.
  */
 
-import { Observable, fromEvent, merge } from "rxjs"
+import { Observable, combineLatest, fromEvent, merge } from "rxjs"
 import { map, shareReplay, startWith } from "rxjs/operators"
 
-/* ----------------------------------------------------------------------------
- * Data
- * ------------------------------------------------------------------------- */
-
-/**
- * Observable for window scroll events
- */
-const scroll$ = fromEvent<UIEvent>(window, "scroll")
-
-/**
- * Observable for window resize events
- */
-const resize$ = fromEvent<UIEvent>(window, "resize")
-
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
@@ -57,6 +43,28 @@ export interface ViewportSize {
   height: number                       /* Viewport height */
 }
 
+/**
+ * Viewport
+ */
+export interface Viewport {
+  offset: ViewportOffset               /* Viewport offset */
+  size: ViewportSize                   /* Viewport size */
+}
+
+/* ----------------------------------------------------------------------------
+ * Data
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Observable for window scroll events
+ */
+const scroll$ = fromEvent<UIEvent>(window, "scroll")
+
+/**
+ * Observable for window resize events
+ */
+const resize$ = fromEvent<UIEvent>(window, "resize")
+
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
@@ -96,8 +104,7 @@ export function watchViewportOffset(): Observable<ViewportOffset> {
   return merge(scroll$, resize$)
     .pipe(
       map(getViewportOffset),
-      startWith(getViewportOffset()),
-      shareReplay(1)
+      startWith(getViewportOffset())
     )
 }
 
@@ -110,7 +117,22 @@ export function watchViewportSize(): Observable<ViewportSize> {
   return resize$
     .pipe(
       map(getViewportSize),
-      startWith(getViewportSize()),
+      startWith(getViewportSize())
+    )
+}
+
+/**
+ * Watch viewport
+ *
+ * @return Viewport observable
+ */
+export function watchViewport(): Observable<Viewport> {
+  return combineLatest([
+    watchViewportOffset(),
+    watchViewportSize()
+  ])
+    .pipe(
+      map(([offset, size]) => ({ offset, size })),
       shareReplay(1)
     )
 }
diff --git a/src/assets/javascripts/components/search/result/index.ts b/src/assets/javascripts/observables/agent/viewport/index.ts
similarity index 96%
rename from src/assets/javascripts/components/search/result/index.ts
rename to src/assets/javascripts/observables/agent/viewport/index.ts
index 36d255be5..0aed2e77e 100644
--- a/src/assets/javascripts/components/search/result/index.ts
+++ b/src/assets/javascripts/observables/agent/viewport/index.ts
@@ -21,5 +21,4 @@
  */
 
 export * from "./_"
-export * from "./list"
-export * from "./meta"
+export * from "./relative"
diff --git a/src/assets/javascripts/components/search/result/meta/index.ts b/src/assets/javascripts/observables/agent/viewport/relative/index.ts
similarity index 64%
rename from src/assets/javascripts/components/search/result/meta/index.ts
rename to src/assets/javascripts/observables/agent/viewport/relative/index.ts
index f760f2caf..5763b91d9 100644
--- a/src/assets/javascripts/components/search/result/meta/index.ts
+++ b/src/assets/javascripts/observables/agent/viewport/relative/index.ts
@@ -20,15 +20,11 @@
  * IN THE SOFTWARE.
  */
 
-import { MonoTypeOperatorFunction, Observable, pipe } from "rxjs"
-import { map, withLatestFrom } from "rxjs/operators"
+import { Observable, combineLatest } from "rxjs"
+import { map, shareReplay } from "rxjs/operators"
 
-import {
-  resetSearchResultMeta,
-  setSearchResultMeta
-} from "actions"
-import { SearchResult } from "modules"
-import { getElement } from "utilities"
+import { Header } from "../../../header"
+import { Viewport } from "../_"
 
 /* ----------------------------------------------------------------------------
  * Helper types
@@ -38,7 +34,8 @@ import { getElement } from "utilities"
  * Options
  */
 interface Options {
-  query$: Observable<string>           /* Search query observable */
+  header$: Observable<Header>          /* Header observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -46,26 +43,25 @@ interface Options {
  * ------------------------------------------------------------------------- */
 
 /**
- * Paint search result metadata from source observable
+ * Watch viewport relative to element
  *
- * @param el - Search result metadata element
+ * @param el - Element
  * @param options - Options
  *
- * @return Operator function
+ * @return Viewport observable
  */
-export function paintSearchResultMeta(
-  el: HTMLElement, { query$ }: Options
-): MonoTypeOperatorFunction<SearchResult[]> {
-  const meta = getElement(".md-search-result__meta", el)!
-  return pipe(
-    withLatestFrom(query$),
-    map(([result, query]) => {
-      if (query) {
-        setSearchResultMeta(meta, result.length)
-      } else {
-        resetSearchResultMeta(meta)
-      }
-      return result
-    })
-  )
+export function watchViewportFrom(
+  el: HTMLElement, { header$, viewport$ }: Options
+): Observable<Viewport> {
+  return combineLatest([viewport$, header$])
+    .pipe(
+      map(([{ offset, size }, { height }]) => ({
+        offset: {
+          x: offset.x - el.offsetLeft,
+          y: offset.y - el.offsetTop + height
+        },
+        size
+      })),
+      shareReplay(1)
+    )
 }
diff --git a/src/assets/javascripts/utilities/agent/worker/index.ts b/src/assets/javascripts/observables/agent/worker/index.ts
similarity index 81%
rename from src/assets/javascripts/utilities/agent/worker/index.ts
rename to src/assets/javascripts/observables/agent/worker/index.ts
index 6b8ccc3cd..d3cd942bd 100644
--- a/src/assets/javascripts/utilities/agent/worker/index.ts
+++ b/src/assets/javascripts/observables/agent/worker/index.ts
@@ -20,7 +20,7 @@
  * IN THE SOFTWARE.
  */
 
-import { Observable, fromEvent } from "rxjs"
+import { Observable, Subject, fromEvent } from "rxjs"
 import { pluck, share, switchMapTo, tap, throttle } from "rxjs/operators"
 
 /* ----------------------------------------------------------------------------
@@ -35,6 +35,18 @@ export interface WorkerMessage {
   data: unknown                        /* Message data */
 }
 
+/**
+ * Worker handler
+ *
+ * @template T - Message type
+ */
+export interface WorkerHandler<
+  T extends WorkerMessage
+> {
+  tx$: Subject<T>                      /* Message transmission subject */
+  rx$: Observable<T>                   /* Message receive observable */
+}
+
 /* ----------------------------------------------------------------------------
  * Helper types
  * ------------------------------------------------------------------------- */
@@ -45,7 +57,7 @@ export interface WorkerMessage {
  * @template T - Worker message type
  */
 interface Options<T extends WorkerMessage> {
-  send$: Observable<T>                 /* Message observable */
+  tx$: Observable<T>                   /* Message transmission observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -61,26 +73,26 @@ interface Options<T extends WorkerMessage> {
  * emitted during a pending request are throttled, the last one is emitted.
  *
  * @param worker - Web worker
+ * @param options - Options
  *
  * @return Worker message observable
  */
 export function watchWorker<T extends WorkerMessage>(
-  worker: Worker, { send$ }: Options<T>
+  worker: Worker, { tx$ }: Options<T>
 ): Observable<T> {
 
   /* Intercept messages from web worker */
-  const recv$ = fromEvent(worker, "message")
+  const rx$ = fromEvent(worker, "message")
     .pipe(
-      pluck<Event, T>("data"),
-      share()
+      pluck<Event, T>("data")
     )
 
   /* Send and receive messages, return hot observable */
-  return send$
+  return tx$
     .pipe(
-      throttle(() => recv$, { leading: true, trailing: true }),
+      throttle(() => rx$, { leading: true, trailing: true }),
       tap(message => worker.postMessage(message)),
-      switchMapTo(recv$),
+      switchMapTo(rx$),
       share()
     )
 }
diff --git a/src/assets/javascripts/components/toc/anchor/index.ts b/src/assets/javascripts/observables/anchor/index.ts
similarity index 93%
rename from src/assets/javascripts/components/toc/anchor/index.ts
rename to src/assets/javascripts/observables/anchor/index.ts
index 554b0fd8c..3cd8e555e 100644
--- a/src/assets/javascripts/components/toc/anchor/index.ts
+++ b/src/assets/javascripts/observables/anchor/index.ts
@@ -30,6 +30,7 @@ import {
 } from "rxjs"
 import {
   distinctUntilChanged,
+  distinctUntilKeyChanged,
   finalize,
   map,
   observeOn,
@@ -45,9 +46,9 @@ import {
   setAnchorActive,
   setAnchorBlur
 } from "actions"
-import { Agent, getElement } from "utilities"
 
-import { HeaderState } from "../../header"
+import { Viewport, getElement } from "../agent"
+import { Header } from "../header"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -69,7 +70,8 @@ export interface AnchorList {
  * Options
  */
 interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
+  header$: Observable<Header>          /* Header observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -92,13 +94,12 @@ interface Options {
  * Note that the current anchor is the last item of the `prev` anchor list.
  *
  * @param els - Anchor elements
- * @param agent - Agent
  * @param options - Options
  *
  * @return Anchor list observable
  */
 export function watchAnchorList(
-  els: HTMLAnchorElement[], { viewport }: Agent, { header$ }: Options
+  els: HTMLAnchorElement[], { header$, viewport$ }: Options
 ): Observable<AnchorList> {
   const table = new Map<HTMLAnchorElement, HTMLElement>()
   for (const el of els) {
@@ -115,8 +116,9 @@ export function watchAnchorList(
     )
 
   /* Compute partition of previous and next anchors */
-  const partition$ = viewport.size$
+  const partition$ = viewport$
     .pipe(
+      distinctUntilKeyChanged("size"),
 
       /* Build index to map anchor paths to vertical offsets */
       map(() => {
@@ -138,9 +140,9 @@ export function watchAnchorList(
       }),
 
       /* Re-compute partition when viewport offset changes */
-      switchMap(index => combineLatest(viewport.offset$, adjust$)
+      switchMap(index => combineLatest(viewport$, adjust$)
         .pipe(
-          scan(([prev, next], [{ y }, adjust]) => {
+          scan(([prev, next], [{ offset: { y } }, adjust]) => {
 
             /* Look forward */
             while (next.length) {
diff --git a/src/assets/javascripts/components/header/_/index.ts b/src/assets/javascripts/observables/header/index.ts
similarity index 82%
rename from src/assets/javascripts/components/header/_/index.ts
rename to src/assets/javascripts/observables/header/index.ts
index 1447daa8b..1ff275bce 100644
--- a/src/assets/javascripts/components/header/_/index.ts
+++ b/src/assets/javascripts/observables/header/index.ts
@@ -20,16 +20,16 @@
  * IN THE SOFTWARE.
  */
 
-import { Observable, defer, of } from "rxjs"
+import { Observable, of } from "rxjs"
 
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Header state
+ * Header
  */
-export interface HeaderState {
+export interface Header {
   sticky: boolean                      /* Header stickyness */
   height: number                       /* Header visible height */
 }
@@ -46,19 +46,15 @@ export interface HeaderState {
  *
  * @param el - Header element
  *
- * @return Header state observable
+ * @return Header observable
  */
 export function watchHeader(
   el: HTMLElement
-): Observable<HeaderState> {
-  return defer(() => {
-    const sticky = getComputedStyle(el)
-      .getPropertyValue("position") === "sticky"
-
-    /* Return header as hot observable */
-    return of({
-      sticky,
-      height: sticky ? el.offsetHeight : 0
-    })
+): Observable<Header> {
+  const styles = getComputedStyle(el)
+  const sticky = styles.position === "sticky"
+  return of({
+    sticky,
+    height: sticky ? el.offsetHeight : 0
   })
 }
diff --git a/src/assets/javascripts/actions/toc/index.ts b/src/assets/javascripts/observables/index.ts
similarity index 88%
rename from src/assets/javascripts/actions/toc/index.ts
rename to src/assets/javascripts/observables/index.ts
index 0189fd3ad..7755669c8 100644
--- a/src/assets/javascripts/actions/toc/index.ts
+++ b/src/assets/javascripts/observables/index.ts
@@ -20,4 +20,10 @@
  * IN THE SOFTWARE.
  */
 
+export * from "./agent"
 export * from "./anchor"
+export * from "./header"
+export * from "./main"
+export * from "./navigation"
+export * from "./search"
+export * from "./toggle"
diff --git a/src/assets/javascripts/components/main/_/index.ts b/src/assets/javascripts/observables/main/_/index.ts
similarity index 71%
rename from src/assets/javascripts/components/main/_/index.ts
rename to src/assets/javascripts/observables/main/_/index.ts
index 8aff0516a..1158c6eff 100644
--- a/src/assets/javascripts/components/main/_/index.ts
+++ b/src/assets/javascripts/observables/main/_/index.ts
@@ -20,27 +20,25 @@
  * IN THE SOFTWARE.
  */
 
-import { Observable, OperatorFunction, combineLatest, pipe } from "rxjs"
+import { Observable, combineLatest } from "rxjs"
 import {
   distinctUntilChanged,
   map,
   pluck,
-  shareReplay,
-  switchMap
+  shareReplay
 } from "rxjs/operators"
 
-import { Agent } from "utilities"
-
-import { HeaderState } from "../../header"
+import { Viewport } from "../../agent"
+import { Header } from "../../header"
 
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Main area state
+ * Main area
  */
-export interface MainState {
+export interface Main {
   offset: number                       /* Main area top offset */
   height: number                       /* Main area visible height */
   active: boolean                      /* Scrolled past top offset */
@@ -54,7 +52,8 @@ export interface MainState {
  * Options
  */
 interface Options {
-  header$: Observable<HeaderState>     /* Header state observable */
+  header$: Observable<Header>          /* Header observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -65,18 +64,17 @@ interface Options {
  * Watch main area
  *
  * This function returns an observable that computes the visual parameters of
- * the main area which depends on the viewport height and vertical offset, as
+ * the main area which depends on the viewport vertical offset and height, as
  * well as the height of the header element, if the header is fixed.
  *
  * @param el - Main area element
- * @param agent - Agent
  * @param options - Options
  *
- * @return Main area state observable
+ * @return Main area observable
  */
 export function watchMain(
-  el: HTMLElement, { viewport }: Agent, { header$ }: Options
-): Observable<MainState> {
+  el: HTMLElement, { header$, viewport$ }: Options
+): Observable<Main> {
 
   /* Compute necessary adjustment for header */
   const adjust$ = header$
@@ -85,13 +83,9 @@ export function watchMain(
     )
 
   /* Compute the main area's visible height */
-  const height$ = combineLatest([
-    viewport.offset$,
-    viewport.size$,
-    adjust$
-  ])
+  const height$ = combineLatest([viewport$, adjust$])
     .pipe(
-      map(([{ y }, { height }, adjust]) => {
+      map(([{ offset: { y }, size: { height } }, adjust]) => {
         const top    = el.offsetTop
         const bottom = el.offsetHeight + top
         return height
@@ -102,9 +96,9 @@ export function watchMain(
     )
 
   /* Compute whether the viewport offset is past the main area's top */
-  const active$ = combineLatest([viewport.offset$, adjust$])
+  const active$ = combineLatest([viewport$, adjust$])
     .pipe(
-      map(([{ y }, adjust]) => y >= el.offsetTop - adjust),
+      map(([{ offset: { y } }, adjust]) => y >= el.offsetTop - adjust),
       distinctUntilChanged()
     )
 
@@ -115,25 +109,7 @@ export function watchMain(
         offset: el.offsetTop - adjust,
         height,
         active
-      }))
+      })),
+      shareReplay(1)
     )
 }
-
-/* ------------------------------------------------------------------------- */
-
-/**
- * Mount main area from source observable
- *
- * @param agent - Agent
- * @param options - Options
- *
- * @return Operator function
- */
-export function mountMain(
-  agent: Agent, options: Options
-): OperatorFunction<HTMLElement, MainState> {
-  return pipe(
-    switchMap(el => watchMain(el, agent, options)),
-    shareReplay(1)
-  )
-}
diff --git a/src/assets/javascripts/utilities/hidden/index.ts b/src/assets/javascripts/observables/main/hideable/index.ts
similarity index 92%
rename from src/assets/javascripts/utilities/hidden/index.ts
rename to src/assets/javascripts/observables/main/hideable/index.ts
index 7ca7e9c0f..6869ac617 100644
--- a/src/assets/javascripts/utilities/hidden/index.ts
+++ b/src/assets/javascripts/observables/main/hideable/index.ts
@@ -31,7 +31,7 @@ import {
 
 import { resetHidden, setHidden } from "actions"
 
-import { ViewportOffset } from "../agent"
+import { Viewport } from "../../agent"
 
 /* ----------------------------------------------------------------------------
  * Functions
@@ -45,11 +45,11 @@ import { ViewportOffset } from "../agent"
  *
  * @return Operator function
  */
-export function paintHidden(
+export function paintHideable(
   el: HTMLElement, offset: number = 0
-): OperatorFunction<ViewportOffset, boolean> {
+): OperatorFunction<Viewport, boolean> {
   return pipe(
-    map(({ y }) => y >= offset),
+    map(({ offset: { y } }) => y >= offset),
     distinctUntilChanged(),
 
     /* Defer repaint to next animation frame */
diff --git a/src/assets/javascripts/components/main/index.ts b/src/assets/javascripts/observables/main/index.ts
similarity index 97%
rename from src/assets/javascripts/components/main/index.ts
rename to src/assets/javascripts/observables/main/index.ts
index 935b1dc46..dcd2617d0 100644
--- a/src/assets/javascripts/components/main/index.ts
+++ b/src/assets/javascripts/observables/main/index.ts
@@ -21,4 +21,5 @@
  */
 
 export * from "./_"
+export * from "./hideable"
 export * from "./sidebar"
diff --git a/src/assets/javascripts/components/main/sidebar/index.ts b/src/assets/javascripts/observables/main/sidebar/index.ts
similarity index 85%
rename from src/assets/javascripts/components/main/sidebar/index.ts
rename to src/assets/javascripts/observables/main/sidebar/index.ts
index 61af9c835..bbd0419bb 100644
--- a/src/assets/javascripts/components/main/sidebar/index.ts
+++ b/src/assets/javascripts/observables/main/sidebar/index.ts
@@ -43,18 +43,18 @@ import {
   setSidebarHeight,
   setSidebarLock
 } from "actions"
-import { Agent } from "utilities"
 
-import { MainState } from "../_"
+import { Viewport } from "../../agent"
+import { Main } from "../_"
 
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Sidebar state
+ * Sidebar
  */
-export interface SidebarState {
+export interface Sidebar {
   height: number                       /* Sidebar height */
   lock: boolean                        /* Sidebar lock */
 }
@@ -67,7 +67,8 @@ export interface SidebarState {
  * Options
  */
 interface Options {
-  main$: Observable<MainState>         /* Main area state observable */
+  main$: Observable<Main>              /* Main area observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -83,14 +84,13 @@ interface Options {
  * sidebar is locked and fills the remaining space.
  *
  * @param el - Sidebar element
- * @param agent - Agent
  * @param options - Options
  *
- * @return Sidebar state observable
+ * @return Sidebar observable
  */
 export function watchSidebar(
-  el: HTMLElement, { viewport }: Agent, { main$ }: Options
-): Observable<SidebarState> {
+  el: HTMLElement, { main$, viewport$ }: Options
+): Observable<Sidebar> {
 
   /* Adjust for internal main area offset */
   const adjust = parseFloat(
@@ -99,24 +99,24 @@ export function watchSidebar(
   )
 
   /* Compute the sidebar's available height */
-  const height$ = combineLatest([viewport.offset$, main$])
+  const height$ = combineLatest([viewport$, main$])
     .pipe(
-      map(([{ y }, { offset, height }]) => {
+      map(([{ offset: { y } }, { offset, height }]) => {
         return height - adjust + Math.min(adjust, Math.max(0, y - offset))
       })
     )
 
   /* Compute whether the sidebar should be locked */
-  const lock$ = combineLatest([viewport.offset$, main$])
+  const lock$ = combineLatest([viewport$, main$])
     .pipe(
-      map(([{ y }, { offset }]) => y >= offset + adjust)
+      map(([{ offset: { y } }, { offset }]) => y >= offset + adjust)
     )
 
   /* Combine into single hot observable */
   return combineLatest([height$, lock$])
     .pipe(
       map(([height, lock]) => ({ height, lock })),
-      distinctUntilChanged<SidebarState>(equals),
+      distinctUntilChanged<Sidebar>(equals),
       shareReplay(1)
     )
 }
@@ -132,7 +132,7 @@ export function watchSidebar(
  */
 export function paintSidebar(
   el: HTMLElement
-): MonoTypeOperatorFunction<SidebarState> {
+): MonoTypeOperatorFunction<Sidebar> {
   return pipe(
 
     /* Defer repaint to next animation frame */
diff --git a/src/assets/javascripts/components/navigation/index.ts b/src/assets/javascripts/observables/navigation/index.ts
similarity index 97%
rename from src/assets/javascripts/components/navigation/index.ts
rename to src/assets/javascripts/observables/navigation/index.ts
index 8bf56dec7..d3f12c1e9 100644
--- a/src/assets/javascripts/components/navigation/index.ts
+++ b/src/assets/javascripts/observables/navigation/index.ts
@@ -20,4 +20,4 @@
  * IN THE SOFTWARE.
  */
 
-export * from "./_"
+export * from "./layer"
diff --git a/src/assets/javascripts/components/navigation/layer/index.ts b/src/assets/javascripts/observables/navigation/layer/index.ts
similarity index 86%
rename from src/assets/javascripts/components/navigation/layer/index.ts
rename to src/assets/javascripts/observables/navigation/layer/index.ts
index 36590b0d0..b5b49fd74 100644
--- a/src/assets/javascripts/components/navigation/layer/index.ts
+++ b/src/assets/javascripts/observables/navigation/layer/index.ts
@@ -43,16 +43,17 @@ import {
   resetOverflowScrolling,
   setOverflowScrolling
 } from "actions"
-import { getElement } from "utilities"
+
+import { getElement } from "../../agent"
 
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Active layer
+ * Navigation layer
  */
-export interface ActiveLayer {
+export interface NavigationLayer {
   prev?: HTMLElement                   /* Layer (previous) */
   next: HTMLElement                    /* Layer (next) */
 }
@@ -62,20 +63,20 @@ export interface ActiveLayer {
  * ------------------------------------------------------------------------- */
 
 /**
- * Watch active layer
+ * Watch navigation layer
  *
  * On iOS we want to add `-webkit-overflow-scrolling: touch` for the menus
  * contained in the drawer, but as the navigational layers are nested, we can
- * only add it to the active layer because otherwise weird cropping will occur.
- * This implementation keeps track of the previous and currently active layer.
+ * only add it to the navigation layer or extremely weird cropping will occur.
+ * This implementation keeps track of the previous and current layer.
  *
  * @param els - Navigation elements
  *
- * @return Active layer observable
+ * @return Navigation layer observable
  */
-export function watchActiveLayer(
+export function watchNavigationLayer(
   els: HTMLElement[]
-): Observable<ActiveLayer> {
+): Observable<NavigationLayer> {
   const table = new Map<HTMLInputElement, HTMLElement>()
   for (const el of els) {
     const label = getElement<HTMLLabelElement>("label", el)
@@ -86,7 +87,7 @@ export function watchActiveLayer(
   }
 
   /* Determine active layer */
-  const active$ = merge(
+  const layer$ = merge(
     ...[...table.keys()].map(input => fromEvent(input, "change"))
   )
     .pipe(
@@ -96,7 +97,7 @@ export function watchActiveLayer(
     )
 
   /* Return previous and next layer */
-  return active$
+  return layer$
     .pipe(
       map(next => ({ next })),
       scan(({ next: prev }, { next }) => ({ prev, next })),
@@ -107,15 +108,15 @@ export function watchActiveLayer(
 /* ------------------------------------------------------------------------- */
 
 /**
- * Paint active layer from source observable
+ * Paint navigation layer from source observable
  *
  * @param els - Navigation elements
  *
  * @return Operator function
  */
-export function paintActiveLayer(
+export function paintNavigationLayer(
   els: HTMLElement[]
-): MonoTypeOperatorFunction<ActiveLayer> {
+): MonoTypeOperatorFunction<NavigationLayer> {
   return pipe(
 
     /* Defer repaint to next animation frame */
@@ -125,14 +126,6 @@ export function paintActiveLayer(
         resetOverflowScrolling(prev)
     }),
 
-    /* Reset on complete or error */
-    finalize(() => {
-      for (const el of els)
-        resetOverflowScrolling(
-          getElement(".md-nav__list", el)!
-        )
-    }),
-
     /* Wait until transition has finished */
     delay(250),
 
@@ -140,6 +133,14 @@ export function paintActiveLayer(
     observeOn(animationFrameScheduler),
     tap(({ next }) => {
       setOverflowScrolling(next)
+    }),
+
+    /* Reset on complete or error */
+    finalize(() => {
+      for (const el of els)
+        resetOverflowScrolling(
+          getElement(".md-nav__list", el)!
+        )
     })
   )
 }
diff --git a/src/assets/javascripts/components/search/index.ts b/src/assets/javascripts/observables/search/index.ts
similarity index 100%
rename from src/assets/javascripts/components/search/index.ts
rename to src/assets/javascripts/observables/search/index.ts
diff --git a/src/assets/javascripts/components/search/query/index.ts b/src/assets/javascripts/observables/search/query/index.ts
similarity index 70%
rename from src/assets/javascripts/components/search/query/index.ts
rename to src/assets/javascripts/observables/search/query/index.ts
index c37d5c17c..8828d991a 100644
--- a/src/assets/javascripts/components/search/query/index.ts
+++ b/src/assets/javascripts/observables/search/query/index.ts
@@ -28,18 +28,18 @@ import {
   startWith
 } from "rxjs/operators"
 
-import { watchElementFocus } from "utilities"
+import { watchElementFocus } from "../../agent"
 
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Search query state
+ * Search query
  */
-export interface SearchQueryState {
+export interface SearchQuery {
   value: string                        /* Query value */
-  focus: boolean                       /* Query focus state */
+  focus: boolean                       /* Query focus */
 }
 
 /* ----------------------------------------------------------------------------
@@ -50,7 +50,28 @@ export interface SearchQueryState {
  * Options
  */
 interface Options {
-  prepare(value: string): string       /* Preparation function */
+  transform?(value: string): string    /* Transformation function */
+}
+
+/* ----------------------------------------------------------------------------
+ * Helper functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Default transformation function
+ *
+ * Rogue control characters are filtered before handing the query to the
+ * search index, as lunr will throw otherwise.
+ *
+ * @param value - Query value
+ *
+ * @return Transformed query value
+ */
+function defaultTransform(value: string): string {
+  return value
+    .replace(/(?:^|\s+)[*+-:^~]+(?=\s+|$)/g, "")
+    .trim()
+    .replace(/\s+|\b$/g, "* ")
 }
 
 /* ----------------------------------------------------------------------------
@@ -63,17 +84,17 @@ interface Options {
  * @param el - Search query element
  * @param options - Options
  *
- * @return Search query state observable
+ * @return Search query observable
  */
 export function watchSearchQuery(
-  el: HTMLInputElement, { prepare }: Options
-): Observable<SearchQueryState> {
+  el: HTMLInputElement, { transform = defaultTransform }: Options = {}
+): Observable<SearchQuery> {
 
   /* Intercept keyboard events */
   const value$ = fromEvent(el, "keyup")
     .pipe(
-      map(() => prepare(el.value)),
-      startWith(""),
+      map(() => transform(el.value)),
+      startWith(el.value),
       distinctUntilChanged()
     )
 
diff --git a/src/assets/javascripts/components/search/reset/index.ts b/src/assets/javascripts/observables/search/reset/index.ts
similarity index 100%
rename from src/assets/javascripts/components/search/reset/index.ts
rename to src/assets/javascripts/observables/search/reset/index.ts
diff --git a/src/assets/javascripts/components/search/result/list/index.ts b/src/assets/javascripts/observables/search/result/index.ts
similarity index 75%
rename from src/assets/javascripts/components/search/result/list/index.ts
rename to src/assets/javascripts/observables/search/result/index.ts
index 2f3026c1e..ec13603a6 100644
--- a/src/assets/javascripts/components/search/result/list/index.ts
+++ b/src/assets/javascripts/observables/search/result/index.ts
@@ -28,19 +28,25 @@ import {
 } from "rxjs"
 import {
   finalize,
+  map,
   mapTo,
   observeOn,
   scan,
-  switchMap
+  switchMap,
+  withLatestFrom
 } from "rxjs/operators"
 
 import {
   addToSearchResultList,
-  resetSearchResultList
+  resetSearchResultList,
+  resetSearchResultMeta,
+  setSearchResultMeta
 } from "actions"
 import { SearchResult } from "modules"
 import { renderSearchResult } from "templates"
-import { getElement } from "utilities"
+
+import { getElement } from "../../agent"
+import { SearchQuery } from "../query"
 
 /* ----------------------------------------------------------------------------
  * Helper types
@@ -50,7 +56,8 @@ import { getElement } from "utilities"
  * Options
  */
 interface Options {
-  render$: Observable<boolean>         /* Render trigger observable */
+  query$: Observable<SearchQuery>     /* Search query observable */
+  fetch$: Observable<boolean>         /* Search trigger observable */
 }
 
 /* ----------------------------------------------------------------------------
@@ -58,25 +65,39 @@ interface Options {
  * ------------------------------------------------------------------------- */
 
 /**
- * Paint search result list from source observable
+ * Paint search results from source observable
  *
  * @param el - Search result element
  * @param options - Options
  *
  * @return Operator function
  */
-export function paintSearchResultList(
-  el: HTMLElement, { render$ }: Options
+export function paintSearchResult(
+  el: HTMLElement, { query$, fetch$ }: Options
 ): MonoTypeOperatorFunction<SearchResult[]> {
-  const container = el.parentElement!
   const list = getElement(".md-search-result__list", el)!
+  const meta = getElement(".md-search-result__meta", el)!
   return pipe(
-    switchMap(result => render$
+
+    /* Paint search result metadata */
+    withLatestFrom(query$),
+    map(([result, query]) => {
+      if (query.value) {
+        setSearchResultMeta(meta, result.length)
+      } else {
+        resetSearchResultMeta(meta)
+      }
+      return result
+    }),
+
+    /* Paint search result list */
+    switchMap(result => fetch$
       .pipe(
 
         /* Defer repaint to next animation frame */
         observeOn(animationFrameScheduler),
         scan(index => {
+          const container = el.parentElement!
           while (index < result.length) {
             addToSearchResultList(list, renderSearchResult(result[index++]))
             if (container.scrollHeight - container.offsetHeight > 16)
diff --git a/src/assets/javascripts/utilities/toggle/index.ts b/src/assets/javascripts/observables/toggle/index.ts
similarity index 96%
rename from src/assets/javascripts/utilities/toggle/index.ts
rename to src/assets/javascripts/observables/toggle/index.ts
index a3304b3e0..8e0946c8e 100644
--- a/src/assets/javascripts/utilities/toggle/index.ts
+++ b/src/assets/javascripts/observables/toggle/index.ts
@@ -32,7 +32,7 @@ import { map, startWith } from "rxjs/operators"
  *
  * Simulating a click event seems to be the most cross-browser compatible way
  * of changing the value while also emitting a `change` event. Before, Material
- * used `CustomEvent` to programatically change the value of a toggle, but this
+ * used `CustomEvent` to programmatically change the value of a toggle, but this
  * is a much simpler and cleaner solution.
  *
  * @param el - Toggle element
diff --git a/src/assets/javascripts/templates/clipboard/index.tsx b/src/assets/javascripts/templates/clipboard/index.tsx
index 8e2a28172..e1e8cb411 100644
--- a/src/assets/javascripts/templates/clipboard/index.tsx
+++ b/src/assets/javascripts/templates/clipboard/index.tsx
@@ -20,8 +20,7 @@
  * IN THE SOFTWARE.
  */
 
-import { h } from "extensions"
-import { translate } from "utilities"
+import { h, translate } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -43,7 +42,7 @@ const css = {
  *
  * @param id - Unique identifier
  *
- * @return HTML element
+ * @return Element
  */
 export function renderClipboard(
   id: string
diff --git a/src/assets/javascripts/templates/index.ts b/src/assets/javascripts/templates/index.ts
index 962476170..ef9602355 100644
--- a/src/assets/javascripts/templates/index.ts
+++ b/src/assets/javascripts/templates/index.ts
@@ -20,5 +20,7 @@
  * IN THE SOFTWARE.
  */
 
+export * from "./clipboard"
 export * from "./search"
 export * from "./source"
+export * from "./table"
diff --git a/src/assets/javascripts/templates/search/index.tsx b/src/assets/javascripts/templates/search/index.tsx
index f6f5c688b..47851f72b 100644
--- a/src/assets/javascripts/templates/search/index.tsx
+++ b/src/assets/javascripts/templates/search/index.tsx
@@ -20,9 +20,8 @@
  * IN THE SOFTWARE.
  */
 
-import { h } from "extensions"
 import { SearchResult } from "modules"
-import { truncate } from "utilities"
+import { h, truncate } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -49,7 +48,7 @@ const css = {
  *
  * @param result - Search result
  *
- * @return HTML element
+ * @return Element
  */
 export function renderSearchResult(
   { article, sections }: SearchResult
diff --git a/src/assets/javascripts/templates/source/index.tsx b/src/assets/javascripts/templates/source/index.tsx
index f5462a010..65d79c32d 100644
--- a/src/assets/javascripts/templates/source/index.tsx
+++ b/src/assets/javascripts/templates/source/index.tsx
@@ -20,7 +20,7 @@
  * IN THE SOFTWARE.
  */
 
-import { h } from "extensions"
+import { h } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -43,7 +43,7 @@ const css = {
  *
  * @param facts - Source facts
  *
- * @return HTML element
+ * @return Element
  */
 export function renderSource(
   facts: any // TODO: add typings
diff --git a/src/assets/javascripts/templates/table/index.tsx b/src/assets/javascripts/templates/table/index.tsx
index 00a254311..db6c2490f 100644
--- a/src/assets/javascripts/templates/table/index.tsx
+++ b/src/assets/javascripts/templates/table/index.tsx
@@ -20,7 +20,7 @@
  * IN THE SOFTWARE.
  */
 
-import { h } from "extensions"
+import { h } from "utilities"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -43,7 +43,7 @@ const css = {
  *
  * @param table - Table element
  *
- * @return HTML element
+ * @return Element
  */
 export function renderTable(
   table: HTMLTableElement
diff --git a/src/assets/javascripts/utilities/agent/_/index.ts b/src/assets/javascripts/utilities/agent/_/index.ts
deleted file mode 100644
index d92844f43..000000000
--- a/src/assets/javascripts/utilities/agent/_/index.ts
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-import { Observable, Subject } from "rxjs"
-
-import {
-  ViewportOffset,
-  ViewportSize,
-  watchDocument,
-  watchLocation,
-  watchLocationHash,
-  watchMedia,
-  watchViewportOffset,
-  watchViewportSize
-} from "utilities"
-
-/* ----------------------------------------------------------------------------
- * Types
- * ------------------------------------------------------------------------- */
-
-/**
- * Agent document
- */
-export interface AgentDocument {
-  load$: Observable<Document>          /* Document observable */
-}
-
-/**
- * Agent location
- */
-export interface AgentLocation {
-  href$: Subject<string>               /* Location subject */
-  hash$: Observable<string>            /* Location hash observable */
-}
-
-/**
- * Agent media
- */
-export interface AgentMedia {
-  tablet$: Observable<boolean>         /* Media observable for tablet */
-  screen$: Observable<boolean>         /* Media observable for screen */
-}
-
-/**
- * Agent viewport
- */
-export interface AgentViewport {
-  offset$: Observable<ViewportOffset>  /* Viewport offset observable */
-  size$: Observable<ViewportSize>      /* Viewport size observable */
-}
-
-/* ------------------------------------------------------------------------- */
-
-/**
- * Agent
- */
-export interface Agent {
-  document: AgentDocument              /* Document observables */
-  location: AgentLocation              /* Location observables */
-  media: AgentMedia                    /* Media observables */
-  viewport: AgentViewport              /* Viewport observables */
-}
-
-/* ----------------------------------------------------------------------------
- * Functions
- * ------------------------------------------------------------------------- */
-
-/**
- * Create the agent
- *
- * This function returns a data structure that contains all observables that
- * are related to the browser and/or environment.
- *
- * @return Agent
- */
-export function setupAgent(): Agent {
-  return {
-    document: {
-      load$:   watchDocument()
-    },
-    location: {
-      href$:   watchLocation(),
-      hash$:   watchLocationHash()
-    },
-    media: {
-      tablet$: watchMedia("(min-width: 960px)"),
-      screen$: watchMedia("(min-width: 1220px)")
-    },
-    viewport: {
-      offset$: watchViewportOffset(),
-      size$:   watchViewportSize()
-    }
-  }
-}
diff --git a/src/assets/javascripts/utilities/index.ts b/src/assets/javascripts/utilities/index.ts
index d4677be9d..afe717e45 100644
--- a/src/assets/javascripts/utilities/index.ts
+++ b/src/assets/javascripts/utilities/index.ts
@@ -20,7 +20,6 @@
  * IN THE SOFTWARE.
  */
 
-export * from "./agent"
-export * from "./hidden"
+export * from "./jsx"
+export * from "./rxjs"
 export * from "./string"
-export * from "./toggle"
diff --git a/src/assets/javascripts/extensions/jsx/index.ts b/src/assets/javascripts/utilities/jsx/index.ts
similarity index 91%
rename from src/assets/javascripts/extensions/jsx/index.ts
rename to src/assets/javascripts/utilities/jsx/index.ts
index 15b54d53a..1889a7211 100644
--- a/src/assets/javascripts/extensions/jsx/index.ts
+++ b/src/assets/javascripts/utilities/jsx/index.ts
@@ -38,7 +38,11 @@ type Attributes =
 /**
  * Child element
  */
-type Child = Child[] | HTMLElement | Text | string | number
+type Child =
+  | HTMLElement
+  | Text
+  | string
+  | number
 
 /* ----------------------------------------------------------------------------
  * Helper functions
@@ -47,10 +51,10 @@ type Child = Child[] | HTMLElement | Text | string | number
 /**
  * Append a child node to an element
  *
- * @param el - HTML element
- * @param child - Child node
+ * @param el - Element
+ * @param child - Child node(s)
  */
-function appendChild(el: HTMLElement, child: Child): void {
+function appendChild(el: HTMLElement, child: Child | Child[]): void {
 
   /* Handle primitive types (including raw HTML) */
   if (typeof child === "string" || typeof child === "number") {
@@ -78,11 +82,10 @@ function appendChild(el: HTMLElement, child: Child): void {
  * @param attributes - HTML attributes
  * @param children - Child elements
  *
- * @return HTML element
+ * @return Element
  */
 export function h(
-  tag: string, attributes: Attributes | null,
-  ...children: Array<HTMLElement | Text | string | number>
+  tag: string, attributes: Attributes | null, ...children: Child[]
 ): HTMLElement {
   const el = document.createElement(tag)
 
diff --git a/src/assets/javascripts/extensions/rxjs/_/index.ts b/src/assets/javascripts/utilities/rxjs/_/index.ts
similarity index 100%
rename from src/assets/javascripts/extensions/rxjs/_/index.ts
rename to src/assets/javascripts/utilities/rxjs/_/index.ts
diff --git a/src/assets/javascripts/extensions/rxjs/index.ts b/src/assets/javascripts/utilities/rxjs/index.ts
similarity index 100%
rename from src/assets/javascripts/extensions/rxjs/index.ts
rename to src/assets/javascripts/utilities/rxjs/index.ts
diff --git a/src/assets/javascripts/extensions/rxjs/operators/index.ts b/src/assets/javascripts/utilities/rxjs/operators/index.ts
similarity index 100%
rename from src/assets/javascripts/extensions/rxjs/operators/index.ts
rename to src/assets/javascripts/utilities/rxjs/operators/index.ts
diff --git a/src/assets/javascripts/utilities/string/index.ts b/src/assets/javascripts/utilities/string/index.ts
index 64a157c78..46fc48f19 100644
--- a/src/assets/javascripts/utilities/string/index.ts
+++ b/src/assets/javascripts/utilities/string/index.ts
@@ -20,7 +20,7 @@
  * IN THE SOFTWARE.
  */
 
-import { getElement } from "../agent"
+import { getElement } from "observables"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -35,23 +35,6 @@ let lang: Record<string, string>
  * Functions
  * ------------------------------------------------------------------------- */
 
-/**
- * Truncate a string after the given number of characters
- *
- * @param value - Value to be truncated
- * @param n - Number of characters
- *
- * @return Truncated value
- */
-export function truncate(value: string, n: number): string {
-  let i = n
-  if (value.length > i) {
-    while (value[i] !== " " && --i > 0); // tslint:disable-line
-    return `${value.substring(0, i)}...`
-  }
-  return value
-}
-
 /**
  * Translate the given key
  *
@@ -72,3 +55,20 @@ export function translate(key: string, value?: string): string {
     ? lang[key].replace("#", value)
     : lang[key]
 }
+
+/**
+ * Truncate a string after the given number of characters
+ *
+ * @param value - Value to be truncated
+ * @param n - Number of characters
+ *
+ * @return Truncated value
+ */
+export function truncate(value: string, n: number): string {
+  let i = n
+  if (value.length > i) {
+    while (value[i] !== " " && --i > 0); // tslint:disable-line
+    return `${value.substring(0, i)}...`
+  }
+  return value
+}
diff --git a/src/assets/javascripts/workers/packer/_/index.ts b/src/assets/javascripts/workers/packer/_/index.ts
index 10ba9b0f8..160e215ae 100644
--- a/src/assets/javascripts/workers/packer/_/index.ts
+++ b/src/assets/javascripts/workers/packer/_/index.ts
@@ -1,4 +1,3 @@
-
 /*
  * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
  *
@@ -14,78 +13,37 @@
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */
 
-/* ----------------------------------------------------------------------------
- * Types
- * ------------------------------------------------------------------------- */
+import { Subject } from "rxjs"
 
-/**
- * Packer message type
- */
-export const enum PackerMessageType {
-  STRING,                              /* String data */
-  BINARY                               /* Packed data */
-}
+import { WorkerHandler, watchWorker } from "observables"
 
-/* ------------------------------------------------------------------------- */
-
-/**
- * A message containing an unpacked string
- */
-export interface PackerStringMessage {
-  type: PackerMessageType.STRING       /* Message type */
-  data: string                         /* Message data */
-}
-
-/**
- * A message containing a packed string
- */
-export interface PackerBinaryMessage {
-  type: PackerMessageType.BINARY       /* Message type */
-  data: string                         /* Message data */
-}
-
-/* ------------------------------------------------------------------------- */
-
-/**
- * A message exchanged with the packer worker
- */
-export type PackerMessage =
-  | PackerStringMessage
-  | PackerBinaryMessage
+import { PackerMessage } from "../message"
 
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
 
 /**
- * Type guard for packer binary messages
+ * Setup packer web worker
  *
- * @param message - Packer worker message
+ * @param worker - Worker instance
+ * @param options - Options
  *
- * @return Test result
+ * @return Worker handler
  */
-export function isPackerBinaryMessage(
-  message: PackerMessage
-): message is PackerBinaryMessage {
-  return message.type === PackerMessageType.BINARY
-}
+export function setupPackerWorker(
+  worker: Worker
+): WorkerHandler<PackerMessage> {
+  const tx$ = new Subject<PackerMessage>()
+  const rx$ = watchWorker(worker, { message$: tx$ })
 
-/**
- * Type guard for packer string messages
- *
- * @param message - Packer worker message
- *
- * @return Test result
- */
-export function isPackerStringMessage(
-  message: PackerMessage
-): message is PackerStringMessage {
-  return message.type === PackerMessageType.STRING
+  /* Return worker handler */
+  return { tx$, rx$ }
 }
diff --git a/src/assets/javascripts/workers/packer/index.ts b/src/assets/javascripts/workers/packer/index.ts
index 8bf56dec7..9fa213e83 100644
--- a/src/assets/javascripts/workers/packer/index.ts
+++ b/src/assets/javascripts/workers/packer/index.ts
@@ -21,3 +21,4 @@
  */
 
 export * from "./_"
+export * from "./message"
diff --git a/src/assets/javascripts/workers/packer/main/index.ts b/src/assets/javascripts/workers/packer/main/index.ts
index c14420a5a..2698fa7ed 100644
--- a/src/assets/javascripts/workers/packer/main/index.ts
+++ b/src/assets/javascripts/workers/packer/main/index.ts
@@ -28,7 +28,7 @@ import {
   decompressFromUTF16
 } from "lz-string"
 
-import { PackerMessage, PackerMessageType } from "../_"
+import { PackerMessage, PackerMessageType } from "../message"
 
 /* ----------------------------------------------------------------------------
  * Data
diff --git a/src/assets/javascripts/components/navigation/_/index.ts b/src/assets/javascripts/workers/packer/message/index.ts
similarity index 53%
rename from src/assets/javascripts/components/navigation/_/index.ts
rename to src/assets/javascripts/workers/packer/message/index.ts
index 7f526bb8e..10ba9b0f8 100644
--- a/src/assets/javascripts/components/navigation/_/index.ts
+++ b/src/assets/javascripts/workers/packer/message/index.ts
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
  *
@@ -20,87 +21,71 @@
  * IN THE SOFTWARE.
  */
 
-import { Observable, OperatorFunction, pipe } from "rxjs"
-import { map, shareReplay } from "rxjs/operators"
-
-import { switchMapIf } from "extensions"
-import { Agent } from "utilities"
-
-import {
-  MainState,
-  SidebarState,
-  paintSidebar,
-  watchSidebar
-} from "../../main"
-
 /* ----------------------------------------------------------------------------
  * Types
  * ------------------------------------------------------------------------- */
 
 /**
- * Navigation state
+ * Packer message type
  */
-export interface NavigationState {
-  sidebar: SidebarState                /* Sidebar state */
+export const enum PackerMessageType {
+  STRING,                              /* String data */
+  BINARY                               /* Packed data */
 }
 
-/* ----------------------------------------------------------------------------
- * Helper types
- * ------------------------------------------------------------------------- */
+/* ------------------------------------------------------------------------- */
 
 /**
- * Options
+ * A message containing an unpacked string
  */
-interface Options {
-  main$: Observable<MainState>         /* Main area state observable */
+export interface PackerStringMessage {
+  type: PackerMessageType.STRING       /* Message type */
+  data: string                         /* Message data */
 }
 
+/**
+ * A message containing a packed string
+ */
+export interface PackerBinaryMessage {
+  type: PackerMessageType.BINARY       /* Message type */
+  data: string                         /* Message data */
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * A message exchanged with the packer worker
+ */
+export type PackerMessage =
+  | PackerStringMessage
+  | PackerBinaryMessage
+
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
 
 /**
- * Watch navigation
+ * Type guard for packer binary messages
  *
- * @param el - Navigation element
- * @param agent - Agent
- * @param options - Options
+ * @param message - Packer worker message
  *
- * @return Navigation state observable
+ * @return Test result
  */
-export function watchNavigation(
-  el: HTMLElement, agent: Agent, { main$ }: Options
-): Observable<NavigationState> {
-
-  /* Watch and paint sidebar */
-  const sidebar$ = watchSidebar(el, agent, { main$ })
-    .pipe(
-      paintSidebar(el)
-    )
-
-  /* Combine into a single hot observable */
-  return sidebar$
-    .pipe(
-      map(sidebar => ({ sidebar }))
-    )
+export function isPackerBinaryMessage(
+  message: PackerMessage
+): message is PackerBinaryMessage {
+  return message.type === PackerMessageType.BINARY
 }
 
-/* ------------------------------------------------------------------------- */
-
 /**
- * Mount navigation from source observable
+ * Type guard for packer string messages
  *
- * @param agent - Agent
- * @param options - Options
+ * @param message - Packer worker message
  *
- * @return Operator function
+ * @return Test result
  */
-export function mountNavigation(
-  agent: Agent, options: Options
-): OperatorFunction<HTMLElement, NavigationState> {
-  const { media } = agent
-  return pipe(
-    switchMapIf(media.screen$, el => watchNavigation(el, agent, options)),
-    shareReplay(1)
-  )
+export function isPackerStringMessage(
+  message: PackerMessage
+): message is PackerStringMessage {
+  return message.type === PackerMessageType.STRING
 }
diff --git a/src/assets/javascripts/workers/search/_/index.ts b/src/assets/javascripts/workers/search/_/index.ts
index e5c6bd7ce..5a89a66d1 100644
--- a/src/assets/javascripts/workers/search/_/index.ts
+++ b/src/assets/javascripts/workers/search/_/index.ts
@@ -20,119 +20,97 @@
  * IN THE SOFTWARE.
  */
 
-import { SearchIndexOptions, SearchResult } from "modules"
+import { Observable, Subject } from "rxjs"
+import { ajax } from "rxjs/ajax"
+import { distinctUntilKeyChanged, map, pluck } from "rxjs/operators"
+
+import { SearchIndexOptions } from "modules"
+import {
+  SearchQuery,
+  WorkerHandler,
+  watchWorker
+} from "observables"
+
+import {
+  SearchMessage,
+  SearchMessageType,
+  SearchQueryMessage,
+  SearchSetupMessage,
+  isSearchResultMessage
+} from "../message"
 
 /* ----------------------------------------------------------------------------
- * Types
+ * Helper types
  * ------------------------------------------------------------------------- */
 
 /**
- * Search message type
+ * Options
  */
-export const enum SearchMessageType {
-  SETUP,                               /* Search index setup */
-  DUMP,                                /* Search index dump */
-  QUERY,                               /* Search query */
-  RESULT                               /* Search results */
+interface Options {
+  base: string                         /* Base url */
+  query$: Observable<SearchQuery>      /* Search query observable */
 }
 
-/* ------------------------------------------------------------------------- */
-
-/**
- * A message containing the data necessary to setup the search index
- */
-export interface SearchSetupMessage {
-  type: SearchMessageType.SETUP        /* Message type */
-  data: SearchIndexOptions             /* Message data */
-}
-
-/**
- * A message containing the a dump of the search index
- */
-export interface SearchDumpMessage {
-  type: SearchMessageType.DUMP        /* Message type */
-  data: string                        /* Message data */
-}
-
-/**
- * A message containing a search query
- */
-export interface SearchQueryMessage {
-  type: SearchMessageType.QUERY        /* Message type */
-  data: string                         /* Message data */
-}
-
-/**
- * A message containing results for a search query
- */
-export interface SearchResultMessage {
-  type: SearchMessageType.RESULT       /* Message type */
-  data: SearchResult[]                 /* Message data */
-}
-
-/* ------------------------------------------------------------------------- */
-
-/**
- * A message exchanged with the search worker
- */
-export type SearchMessage =
-  | SearchSetupMessage
-  | SearchDumpMessage
-  | SearchQueryMessage
-  | SearchResultMessage
-
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
 
 /**
- * Type guard for search setup messages
+ * Setup search web worker
  *
- * @param message - Search worker message
+ * @param url - Worker url
+ * @param options - Options
  *
- * @return Test result
+ * @return Worker handler
  */
-export function isSearchSetupMessage(
-  message: SearchMessage
-): message is SearchSetupMessage {
-  return message.type === SearchMessageType.SETUP
-}
+export function setupSearchWorker(
+  url: string, { base, query$ }: Options
+): WorkerHandler<SearchMessage> {
+  const worker = new Worker(url)
+  const prefix = new URL(base, location.href)
 
-/**
- * Type guard for search dump messages
- *
- * @param message - Search worker message
- *
- * @return Test result
- */
-export function isSearchDumpMessage(
-  message: SearchMessage
-): message is SearchDumpMessage {
-  return message.type === SearchMessageType.DUMP
-}
+  /* Create communication channels and correct relative links */
+  const tx$ = new Subject<SearchMessage>()
+  const rx$ = watchWorker(worker, { tx$ })
+    .pipe(
+      map(message => {
+        if (isSearchResultMessage(message)) {
+          for (const { article, sections } of message.data) {
+            article.location = `${prefix}/${article.location}`
+            for (const section of sections)
+              section.location = `${prefix}/${section.location}`
+          }
+        }
+        return message
+      })
+    )
 
-/**
- * Type guard for search query messages
- *
- * @param message - Search worker message
- *
- * @return Test result
- */
-export function isSearchQueryMessage(
-  message: SearchMessage
-): message is SearchQueryMessage {
-  return message.type === SearchMessageType.QUERY
-}
+  /* Fetch index and setup search worker */
+  ajax({
+    url: `${base}/search/search_index.json`,
+    responseType: "json",
+    withCredentials: true
+  })
+    .pipe(
+      pluck("response"),
+      map<SearchIndexOptions, SearchSetupMessage>(data => ({
+        type: SearchMessageType.SETUP,
+        data
+      }))
+    )
+      .subscribe(tx$.next.bind(tx$))
 
-/**
- * Type guard for search result messages
- *
- * @param message - Search worker message
- *
- * @return Test result
- */
-export function isSearchResultMessage(
-  message: SearchMessage
-): message is SearchResultMessage {
-  return message.type === SearchMessageType.RESULT
+  /* Subscribe to search query */
+  query$
+    .pipe(
+      distinctUntilKeyChanged("value"),
+      map<SearchQuery, SearchQueryMessage>(query => ({
+        type: SearchMessageType.QUERY,
+        data: query.value
+      }))
+    )
+      .subscribe(tx$.next.bind(tx$))
+
+  /* Return worker handler */
+  return { tx$, rx$ }
 }
diff --git a/src/assets/javascripts/workers/search/index.ts b/src/assets/javascripts/workers/search/index.ts
index 8bf56dec7..9fa213e83 100644
--- a/src/assets/javascripts/workers/search/index.ts
+++ b/src/assets/javascripts/workers/search/index.ts
@@ -21,3 +21,4 @@
  */
 
 export * from "./_"
+export * from "./message"
diff --git a/src/assets/javascripts/workers/search/main/index.ts b/src/assets/javascripts/workers/search/main/index.ts
index 8c90a0123..5279e6edf 100644
--- a/src/assets/javascripts/workers/search/main/index.ts
+++ b/src/assets/javascripts/workers/search/main/index.ts
@@ -22,7 +22,7 @@
 
 import { SearchIndex, SearchIndexConfig } from "modules"
 
-import { SearchMessage, SearchMessageType } from "../_"
+import { SearchMessage, SearchMessageType } from "../message"
 
 /* ----------------------------------------------------------------------------
  * Data
@@ -46,7 +46,7 @@ function setupLunrLanguages(config: SearchIndexConfig): void {
   const base = "../lunr"
 
   /* Add scripts for languages */
-  const scripts = [`${base}/min/lunr.stemmer.support.min.js`]
+  const scripts = []
   for (const lang of config.lang) {
     if (lang === "ja") scripts.push(`${base}/tinyseg.js`)
     if (lang !== "en") scripts.push(`${base}/min/lunr.${lang}.min.js`)
@@ -57,7 +57,11 @@ function setupLunrLanguages(config: SearchIndexConfig): void {
     scripts.push(`${base}/min/lunr.multi.min.js`)
 
   /* Load scripts synchronously */
-  importScripts(...scripts)
+  if (scripts.length)
+    importScripts(
+      `${base}/min/lunr.stemmer.support.min.js`,
+      ...scripts
+    )
 }
 
 /* ----------------------------------------------------------------------------
diff --git a/src/assets/javascripts/workers/search/message/index.ts b/src/assets/javascripts/workers/search/message/index.ts
new file mode 100644
index 000000000..e5c6bd7ce
--- /dev/null
+++ b/src/assets/javascripts/workers/search/message/index.ts
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A RTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { SearchIndexOptions, SearchResult } from "modules"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Search message type
+ */
+export const enum SearchMessageType {
+  SETUP,                               /* Search index setup */
+  DUMP,                                /* Search index dump */
+  QUERY,                               /* Search query */
+  RESULT                               /* Search results */
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * A message containing the data necessary to setup the search index
+ */
+export interface SearchSetupMessage {
+  type: SearchMessageType.SETUP        /* Message type */
+  data: SearchIndexOptions             /* Message data */
+}
+
+/**
+ * A message containing the a dump of the search index
+ */
+export interface SearchDumpMessage {
+  type: SearchMessageType.DUMP        /* Message type */
+  data: string                        /* Message data */
+}
+
+/**
+ * A message containing a search query
+ */
+export interface SearchQueryMessage {
+  type: SearchMessageType.QUERY        /* Message type */
+  data: string                         /* Message data */
+}
+
+/**
+ * A message containing results for a search query
+ */
+export interface SearchResultMessage {
+  type: SearchMessageType.RESULT       /* Message type */
+  data: SearchResult[]                 /* Message data */
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * A message exchanged with the search worker
+ */
+export type SearchMessage =
+  | SearchSetupMessage
+  | SearchDumpMessage
+  | SearchQueryMessage
+  | SearchResultMessage
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Type guard for search setup messages
+ *
+ * @param message - Search worker message
+ *
+ * @return Test result
+ */
+export function isSearchSetupMessage(
+  message: SearchMessage
+): message is SearchSetupMessage {
+  return message.type === SearchMessageType.SETUP
+}
+
+/**
+ * Type guard for search dump messages
+ *
+ * @param message - Search worker message
+ *
+ * @return Test result
+ */
+export function isSearchDumpMessage(
+  message: SearchMessage
+): message is SearchDumpMessage {
+  return message.type === SearchMessageType.DUMP
+}
+
+/**
+ * Type guard for search query messages
+ *
+ * @param message - Search worker message
+ *
+ * @return Test result
+ */
+export function isSearchQueryMessage(
+  message: SearchMessage
+): message is SearchQueryMessage {
+  return message.type === SearchMessageType.QUERY
+}
+
+/**
+ * Type guard for search result messages
+ *
+ * @param message - Search worker message
+ *
+ * @return Test result
+ */
+export function isSearchResultMessage(
+  message: SearchMessage
+): message is SearchResultMessage {
+  return message.type === SearchMessageType.RESULT
+}
diff --git a/src/assets/stylesheets/extensions/_admonition.scss b/src/assets/stylesheets/extensions/_admonition.scss
index ce77871d3..9f5b6358e 100644
--- a/src/assets/stylesheets/extensions/_admonition.scss
+++ b/src/assets/stylesheets/extensions/_admonition.scss
@@ -34,7 +34,7 @@
     border-left: px2rem(4px) solid $clr-blue-a200;
     border-radius: px2rem(2px);
     font-size: ms(-1);
-    box-shadow: inset 0 0 0 px2rem(1px) transparentize($clr-blue-a200, 0.75);
+    box-shadow: inset 0 0 0 px2rem(1px) transparentize($clr-blue-a200, 0.85);
     overflow: auto;
 
     // Adjust for RTL languages
@@ -109,7 +109,7 @@
       &%#{nth($names, 1)},
       &.#{nth($names, 1)} {
         border-left-color: $tint;
-        box-shadow: inset 0 0 0 px2rem(1px) transparentize($tint, 0.75);
+        box-shadow: inset 0 0 0 px2rem(1px) transparentize($tint, 0.85);
 
         // Adjust for RTL languages
         [dir="rtl"] & {
diff --git a/src/assets/stylesheets/layout/_base.scss b/src/assets/stylesheets/layout/_base.scss
index 4d0e6aa17..23759f89c 100644
--- a/src/assets/stylesheets/layout/_base.scss
+++ b/src/assets/stylesheets/layout/_base.scss
@@ -76,6 +76,8 @@ body {
 
     // Lock body to viewport height (e.g. in search mode)
     &[data-md-state="lock"] {
+      height: 100%;
+      min-height: auto;
       overflow: hidden;
 
       // Hide container on iOS, or the body will not be locked correctly
@@ -101,12 +103,6 @@ hr {
   margin-left: auto;
 }
 
-// Prevent collapse of margin when setting margin on child element
-.md-container,
-.md-main {
-  overflow: auto;
-}
-
 // Content wrapper
 .md-container {
   display: flex;
diff --git a/tsconfig.json b/tsconfig.json
index 0d5226b22..5c331adda 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -24,8 +24,8 @@
     "paths": {
       "actions": ["actions"],
       "components": ["components"],
-      "extensions": ["extensions"],
       "modules": ["modules"],
+      "observables": ["observables"],
       "templates": ["templates"],
       "utilities": ["utilities"],
       "workers": ["workers"]