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All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\ninterface MaybePolyfilledCe extends CustomElementRegistry {\n readonly polyfillWrapFlushCallback?: object;\n}\n\n/**\n * True if the custom elements polyfill is in use.\n */\nexport const isCEPolyfill = typeof window !== 'undefined' &&\n window.customElements != null &&\n (window.customElements as MaybePolyfilledCe).polyfillWrapFlushCallback !==\n undefined;\n\n/**\n * Reparents nodes, starting from `start` (inclusive) to `end` (exclusive),\n * into another container (could be the same container), before `before`. If\n * `before` is null, it appends the nodes to the container.\n */\nexport const reparentNodes =\n (container: Node,\n start: Node|null,\n end: Node|null = null,\n before: Node|null = null): void => {\n while (start !== end) {\n const n = start!.nextSibling;\n container.insertBefore(start!, before);\n start = n;\n }\n };\n\n/**\n * Removes nodes, starting from `start` (inclusive) to `end` (exclusive), from\n * `container`.\n */\nexport const removeNodes =\n (container: Node, start: Node|null, end: Node|null = null): void => {\n while (start !== end) {\n const n = start!.nextSibling;\n container.removeChild(start!);\n start = n;\n }\n };\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {TemplateResult} from './template-result.js';\n\n/**\n * An expression marker with embedded unique key to avoid collision with\n * possible text in templates.\n */\nexport const marker = `{{lit-${String(Math.random()).slice(2)}}}`;\n\n/**\n * An expression marker used text-positions, multi-binding attributes, and\n * attributes with markup-like text values.\n */\nexport const nodeMarker = `<!--${marker}-->`;\n\nexport const markerRegex = new RegExp(`${marker}|${nodeMarker}`);\n\n/**\n * Suffix appended to all bound attribute names.\n */\nexport const boundAttributeSuffix = '$lit$';\n\n/**\n * An updatable Template that tracks the location of dynamic parts.\n */\nexport class Template {\n readonly parts: TemplatePart[] = [];\n readonly element: HTMLTemplateElement;\n\n constructor(result: TemplateResult, element: HTMLTemplateElement) {\n this.element = element;\n\n const nodesToRemove: Node[] = [];\n const stack: Node[] = [];\n // Edge needs all 4 parameters present; IE11 needs 3rd parameter to be null\n const walker = document.createTreeWalker(\n element.content,\n 133 /* NodeFilter.SHOW_{ELEMENT|COMMENT|TEXT} */,\n null,\n false);\n // Keeps track of the last index associated with a part. We try to delete\n // unnecessary nodes, but we never want to associate two different parts\n // to the same index. They must have a constant node between.\n let lastPartIndex = 0;\n let index = -1;\n let partIndex = 0;\n const {strings, values: {length}} = result;\n while (partIndex < length) {\n const node = walker.nextNode() as Element | Comment | Text | null;\n if (node === null) {\n // We've exhausted the content inside a nested template element.\n // Because we still have parts (the outer for-loop), we know:\n // - There is a template in the stack\n // - The walker will find a nextNode outside the template\n walker.currentNode = stack.pop()!;\n continue;\n }\n index++;\n\n if (node.nodeType === 1 /* Node.ELEMENT_NODE */) {\n if ((node as Element).hasAttributes()) {\n const attributes = (node as Element).attributes;\n const {length} = attributes;\n // Per\n // https://developer.mozilla.org/en-US/docs/Web/API/NamedNodeMap,\n // attributes are not guaranteed to be returned in document order.\n // In particular, Edge/IE can return them out of order, so we cannot\n // assume a correspondence between part index and attribute index.\n let count = 0;\n for (let i = 0; i < length; i++) {\n if (endsWith(attributes[i].name, boundAttributeSuffix)) {\n count++;\n }\n }\n while (count-- > 0) {\n // Get the template literal section leading up to the first\n // expression in this attribute\n const stringForPart = strings[partIndex];\n // Find the attribute name\n const name = lastAttributeNameRegex.exec(stringForPart)![2];\n // Find the corresponding attribute\n // All bound attributes have had a suffix added in\n // TemplateResult#getHTML to opt out of special attribute\n // handling. To look up the attribute value we also need to add\n // the suffix.\n const attributeLookupName =\n name.toLowerCase() + boundAttributeSuffix;\n const attributeValue =\n (node as Element).getAttribute(attributeLookupName)!;\n (node as Element).removeAttribute(attributeLookupName);\n const statics = attributeValue.split(markerRegex);\n this.parts.push({type: 'attribute', index, name, strings: statics});\n partIndex += statics.length - 1;\n }\n }\n if ((node as Element).tagName === 'TEMPLATE') {\n stack.push(node);\n walker.currentNode = (node as HTMLTemplateElement).content;\n }\n } else if (node.nodeType === 3 /* Node.TEXT_NODE */) {\n const data = (node as Text).data;\n if (data.indexOf(marker) >= 0) {\n const parent = node.parentNode!;\n const strings = data.split(markerRegex);\n const lastIndex = strings.length - 1;\n // Generate a new text node for each literal section\n // These nodes are also used as the markers for node parts\n for (let i = 0; i < lastIndex; i++) {\n let insert: Node;\n let s = strings[i];\n if (s === '') {\n insert = createMarker();\n } else {\n const match = lastAttributeNameRegex.exec(s);\n if (match !== null && endsWith(match[2], boundAttributeSuffix)) {\n s = s.slice(0, match.index) + match[1] +\n match[2].slice(0, -boundAttributeSuffix.length) + match[3];\n }\n insert = document.createTextNode(s);\n }\n parent.insertBefore(insert, node);\n this.parts.push({type: 'node', index: ++index});\n }\n // If there's no text, we must insert a comment to mark our place.\n // Else, we can trust it will stick around after cloning.\n if (strings[lastIndex] === '') {\n parent.insertBefore(createMarker(), node);\n nodesToRemove.push(node);\n } else {\n (node as Text).data = strings[lastIndex];\n }\n // We have a part for each match found\n partIndex += lastIndex;\n }\n } else if (node.nodeType === 8 /* Node.COMMENT_NODE */) {\n if ((node as Comment).data === marker) {\n const parent = node.parentNode!;\n // Add a new marker node to be the startNode of the Part if any of\n // the following are true:\n // * We don't have a previousSibling\n // * The previousSibling is already the start of a previous part\n if (node.previousSibling === null || index === lastPartIndex) {\n index++;\n parent.insertBefore(createMarker(), node);\n }\n lastPartIndex = index;\n this.parts.push({type: 'node', index});\n // If we don't have a nextSibling, keep this node so we have an end.\n // Else, we can remove it to save future costs.\n if (node.nextSibling === null) {\n (node as Comment).data = '';\n } else {\n nodesToRemove.push(node);\n index--;\n }\n partIndex++;\n } else {\n let i = -1;\n while ((i = (node as Comment).data.indexOf(marker, i + 1)) !== -1) {\n // Comment node has a binding marker inside, make an inactive part\n // The binding won't work, but subsequent bindings will\n // TODO (justinfagnani): consider whether it's even worth it to\n // make bindings in comments work\n this.parts.push({type: 'node', index: -1});\n partIndex++;\n }\n }\n }\n }\n\n // Remove text binding nodes after the walk to not disturb the TreeWalker\n for (const n of nodesToRemove) {\n n.parentNode!.removeChild(n);\n }\n }\n}\n\nconst endsWith = (str: string, suffix: string): boolean => {\n const index = str.length - suffix.length;\n return index >= 0 && str.slice(index) === suffix;\n};\n\n/**\n * A placeholder for a dynamic expression in an HTML template.\n *\n * There are two built-in part types: AttributePart and NodePart. NodeParts\n * always represent a single dynamic expression, while AttributeParts may\n * represent as many expressions are contained in the attribute.\n *\n * A Template's parts are mutable, so parts can be replaced or modified\n * (possibly to implement different template semantics). The contract is that\n * parts can only be replaced, not removed, added or reordered, and parts must\n * always consume the correct number of values in their `update()` method.\n *\n * TODO(justinfagnani): That requirement is a little fragile. A\n * TemplateInstance could instead be more careful about which values it gives\n * to Part.update().\n */\nexport type TemplatePart = {\n readonly type: 'node'; index: number;\n}|{\n readonly type: 'attribute';\n index: number;\n readonly name: string;\n readonly strings: ReadonlyArray<string>;\n};\n\nexport const isTemplatePartActive = (part: TemplatePart) => part.index !== -1;\n\n// Allows `document.createComment('')` to be renamed for a\n// small manual size-savings.\nexport const createMarker = () => document.createComment('');\n\n/**\n * This regex extracts the attribute name preceding an attribute-position\n * expression. It does this by matching the syntax allowed for attributes\n * against the string literal directly preceding the expression, assuming that\n * the expression is in an attribute-value position.\n *\n * See attributes in the HTML spec:\n * https://www.w3.org/TR/html5/syntax.html#elements-attributes\n *\n * \" \\x09\\x0a\\x0c\\x0d\" are HTML space characters:\n * https://www.w3.org/TR/html5/infrastructure.html#space-characters\n *\n * \"\\0-\\x1F\\x7F-\\x9F\" are Unicode control characters, which includes every\n * space character except \" \".\n *\n * So an attribute is:\n * * The name: any character except a control character, space character, ('),\n * (\"), \">\", \"=\", or \"/\"\n * * Followed by zero or more space characters\n * * Followed by \"=\"\n * * Followed by zero or more space characters\n * * Followed by:\n * * Any character except space, ('), (\"), \"<\", \">\", \"=\", (`), or\n * * (\") then any non-(\"), or\n * * (') then any non-(')\n */\nexport const lastAttributeNameRegex =\n // eslint-disable-next-line no-control-regex\n /([ \\x09\\x0a\\x0c\\x0d])([^\\0-\\x1F\\x7F-\\x9F \"'>=/]+)([ \\x09\\x0a\\x0c\\x0d]*=[ \\x09\\x0a\\x0c\\x0d]*(?:[^ \\x09\\x0a\\x0c\\x0d\"'`<>=]*|\"[^\"]*|'[^']*))$/;\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {isTemplatePartActive, Template, TemplatePart} from './template.js';\n\nconst walkerNodeFilter = 133 /* NodeFilter.SHOW_{ELEMENT|COMMENT|TEXT} */;\n\n/**\n * Removes the list of nodes from a Template safely. In addition to removing\n * nodes from the Template, the Template part indices are updated to match\n * the mutated Template DOM.\n *\n * As the template is walked the removal state is tracked and\n * part indices are adjusted as needed.\n *\n * div\n * div#1 (remove) <-- start removing (removing node is div#1)\n * div\n * div#2 (remove) <-- continue removing (removing node is still div#1)\n * div\n * div <-- stop removing since previous sibling is the removing node (div#1,\n * removed 4 nodes)\n */\nexport function removeNodesFromTemplate(\n template: Template, nodesToRemove: Set<Node>) {\n const {element: {content}, parts} = template;\n const walker =\n document.createTreeWalker(content, walkerNodeFilter, null, false);\n let partIndex = nextActiveIndexInTemplateParts(parts);\n let part = parts[partIndex];\n let nodeIndex = -1;\n let removeCount = 0;\n const nodesToRemoveInTemplate = [];\n let currentRemovingNode: Node|null = null;\n while (walker.nextNode()) {\n nodeIndex++;\n const node = walker.currentNode as Element;\n // End removal if stepped past the removing node\n if (node.previousSibling === currentRemovingNode) {\n currentRemovingNode = null;\n }\n // A node to remove was found in the template\n if (nodesToRemove.has(node)) {\n nodesToRemoveInTemplate.push(node);\n // Track node we're removing\n if (currentRemovingNode === null) {\n currentRemovingNode = node;\n }\n }\n // When removing, increment count by which to adjust subsequent part indices\n if (currentRemovingNode !== null) {\n removeCount++;\n }\n while (part !== undefined && part.index === nodeIndex) {\n // If part is in a removed node deactivate it by setting index to -1 or\n // adjust the index as needed.\n part.index = currentRemovingNode !== null ? -1 : part.index - removeCount;\n // go to the next active part.\n partIndex = nextActiveIndexInTemplateParts(parts, partIndex);\n part = parts[partIndex];\n }\n }\n nodesToRemoveInTemplate.forEach((n) => n.parentNode!.removeChild(n));\n}\n\nconst countNodes = (node: Node) => {\n let count = (node.nodeType === 11 /* Node.DOCUMENT_FRAGMENT_NODE */) ? 0 : 1;\n const walker = document.createTreeWalker(node, walkerNodeFilter, null, false);\n while (walker.nextNode()) {\n count++;\n }\n return count;\n};\n\nconst nextActiveIndexInTemplateParts =\n (parts: TemplatePart[], startIndex = -1) => {\n for (let i = startIndex + 1; i < parts.length; i++) {\n const part = parts[i];\n if (isTemplatePartActive(part)) {\n return i;\n }\n }\n return -1;\n };\n\n/**\n * Inserts the given node into the Template, optionally before the given\n * refNode. In addition to inserting the node into the Template, the Template\n * part indices are updated to match the mutated Template DOM.\n */\nexport function insertNodeIntoTemplate(\n template: Template, node: Node, refNode: Node|null = null) {\n const {element: {content}, parts} = template;\n // If there's no refNode, then put node at end of template.\n // No part indices need to be shifted in this case.\n if (refNode === null || refNode === undefined) {\n content.appendChild(node);\n return;\n }\n const walker =\n document.createTreeWalker(content, walkerNodeFilter, null, false);\n let partIndex = nextActiveIndexInTemplateParts(parts);\n let insertCount = 0;\n let walkerIndex = -1;\n while (walker.nextNode()) {\n walkerIndex++;\n const walkerNode = walker.currentNode as Element;\n if (walkerNode === refNode) {\n insertCount = countNodes(node);\n refNode.parentNode!.insertBefore(node, refNode);\n }\n while (partIndex !== -1 && parts[partIndex].index === walkerIndex) {\n // If we've inserted the node, simply adjust all subsequent parts\n if (insertCount > 0) {\n while (partIndex !== -1) {\n parts[partIndex].index += insertCount;\n partIndex = nextActiveIndexInTemplateParts(parts, partIndex);\n }\n return;\n }\n partIndex = nextActiveIndexInTemplateParts(parts, partIndex);\n }\n }\n}\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {Part} from './part.js';\n\nconst directives = new WeakMap<object, true>();\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nexport type DirectiveFactory = (...args: any[]) => object;\n\nexport type DirectiveFn = (part: Part) => void;\n\n/**\n * Brands a function as a directive factory function so that lit-html will call\n * the function during template rendering, rather than passing as a value.\n *\n * A _directive_ is a function that takes a Part as an argument. It has the\n * signature: `(part: Part) => void`.\n *\n * A directive _factory_ is a function that takes arguments for data and\n * configuration and returns a directive. Users of directive usually refer to\n * the directive factory as the directive. For example, \"The repeat directive\".\n *\n * Usually a template author will invoke a directive factory in their template\n * with relevant arguments, which will then return a directive function.\n *\n * Here's an example of using the `repeat()` directive factory that takes an\n * array and a function to render an item:\n *\n * ```js\n * html`<ul><${repeat(items, (item) => html`<li>${item}</li>`)}</ul>`\n * ```\n *\n * When `repeat` is invoked, it returns a directive function that closes over\n * `items` and the template function. When the outer template is rendered, the\n * return directive function is called with the Part for the expression.\n * `repeat` then performs it's custom logic to render multiple items.\n *\n * @param f The directive factory function. Must be a function that returns a\n * function of the signature `(part: Part) => void`. The returned function will\n * be called with the part object.\n *\n * @example\n *\n * import {directive, html} from 'lit-html';\n *\n * const immutable = directive((v) => (part) => {\n * if (part.value !== v) {\n * part.setValue(v)\n * }\n * });\n */\nexport const directive = <F extends DirectiveFactory>(f: F): F =>\n ((...args: unknown[]) => {\n const d = f(...args);\n directives.set(d, true);\n return d;\n }) as F;\n\nexport const isDirective = (o: unknown): o is DirectiveFn => {\n return typeof o === 'function' && directives.has(o);\n};\n", "/**\n * @license\n * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n * The Part interface represents a dynamic part of a template instance rendered\n * by lit-html.\n */\nexport interface Part {\n readonly value: unknown;\n\n /**\n * Sets the current part value, but does not write it to the DOM.\n * @param value The value that will be committed.\n */\n setValue(value: unknown): void;\n\n /**\n * Commits the current part value, causing it to actually be written to the\n * DOM.\n *\n * Directives are run at the start of `commit`, so that if they call\n * `part.setValue(...)` synchronously that value will be used in the current\n * commit, and there's no need to call `part.commit()` within the directive.\n * If directives set a part value asynchronously, then they must call\n * `part.commit()` manually.\n */\n commit(): void;\n}\n\n/**\n * A sentinel value that signals that a value was handled by a directive and\n * should not be written to the DOM.\n */\nexport const noChange = {};\n\n/**\n * A sentinel value that signals a NodePart to fully clear its content.\n */\nexport const nothing = {};\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {isCEPolyfill} from './dom.js';\nimport {Part} from './part.js';\nimport {RenderOptions} from './render-options.js';\nimport {TemplateProcessor} from './template-processor.js';\nimport {isTemplatePartActive, Template, TemplatePart} from './template.js';\n\n/**\n * An instance of a `Template` that can be attached to the DOM and updated\n * with new values.\n */\nexport class TemplateInstance {\n private readonly __parts: Array<Part|undefined> = [];\n readonly processor: TemplateProcessor;\n readonly options: RenderOptions;\n readonly template: Template;\n\n constructor(\n template: Template, processor: TemplateProcessor,\n options: RenderOptions) {\n this.template = template;\n this.processor = processor;\n this.options = options;\n }\n\n update(values: readonly unknown[]) {\n let i = 0;\n for (const part of this.__parts) {\n if (part !== undefined) {\n part.setValue(values[i]);\n }\n i++;\n }\n for (const part of this.__parts) {\n if (part !== undefined) {\n part.commit();\n }\n }\n }\n\n _clone(): DocumentFragment {\n // There are a number of steps in the lifecycle of a template instance's\n // DOM fragment:\n // 1. Clone - create the instance fragment\n // 2. Adopt - adopt into the main document\n // 3. Process - find part markers and create parts\n // 4. Upgrade - upgrade custom elements\n // 5. Update - set node, attribute, property, etc., values\n // 6. Connect - connect to the document. Optional and outside of this\n // method.\n //\n // We have a few constraints on the ordering of these steps:\n // * We need to upgrade before updating, so that property values will pass\n // through any property setters.\n // * We would like to process before upgrading so that we're sure that the\n // cloned fragment is inert and not disturbed by self-modifying DOM.\n // * We want custom elements to upgrade even in disconnected fragments.\n //\n // Given these constraints, with full custom elements support we would\n // prefer the order: Clone, Process, Adopt, Upgrade, Update, Connect\n //\n // But Safari does not implement CustomElementRegistry#upgrade, so we\n // can not implement that order and still have upgrade-before-update and\n // upgrade disconnected fragments. So we instead sacrifice the\n // process-before-upgrade constraint, since in Custom Elements v1 elements\n // must not modify their light DOM in the constructor. We still have issues\n // when co-existing with CEv0 elements like Polymer 1, and with polyfills\n // that don't strictly adhere to the no-modification rule because shadow\n // DOM, which may be created in the constructor, is emulated by being placed\n // in the light DOM.\n //\n // The resulting order is on native is: Clone, Adopt, Upgrade, Process,\n // Update, Connect. document.importNode() performs Clone, Adopt, and Upgrade\n // in one step.\n //\n // The Custom Elements v1 polyfill supports upgrade(), so the order when\n // polyfilled is the more ideal: Clone, Process, Adopt, Upgrade, Update,\n // Connect.\n\n const fragment = isCEPolyfill ?\n this.template.element.content.cloneNode(true) as DocumentFragment :\n document.importNode(this.template.element.content, true);\n\n const stack: Node[] = [];\n const parts = this.template.parts;\n // Edge needs all 4 parameters present; IE11 needs 3rd parameter to be null\n const walker = document.createTreeWalker(\n fragment,\n 133 /* NodeFilter.SHOW_{ELEMENT|COMMENT|TEXT} */,\n null,\n false);\n let partIndex = 0;\n let nodeIndex = 0;\n let part: TemplatePart;\n let node = walker.nextNode();\n // Loop through all the nodes and parts of a template\n while (partIndex < parts.length) {\n part = parts[partIndex];\n if (!isTemplatePartActive(part)) {\n this.__parts.push(undefined);\n partIndex++;\n continue;\n }\n\n // Progress the tree walker until we find our next part's node.\n // Note that multiple parts may share the same node (attribute parts\n // on a single element), so this loop may not run at all.\n while (nodeIndex < part.index) {\n nodeIndex++;\n if (node!.nodeName === 'TEMPLATE') {\n stack.push(node!);\n walker.currentNode = (node as HTMLTemplateElement).content;\n }\n if ((node = walker.nextNode()) === null) {\n // We've exhausted the content inside a nested template element.\n // Because we still have parts (the outer for-loop), we know:\n // - There is a template in the stack\n // - The walker will find a nextNode outside the template\n walker.currentNode = stack.pop()!;\n node = walker.nextNode();\n }\n }\n\n // We've arrived at our part's node.\n if (part.type === 'node') {\n const part = this.processor.handleTextExpression(this.options);\n part.insertAfterNode(node!.previousSibling!);\n this.__parts.push(part);\n } else {\n this.__parts.push(...this.processor.handleAttributeExpressions(\n node as Element, part.name, part.strings, this.options));\n }\n partIndex++;\n }\n\n if (isCEPolyfill) {\n document.adoptNode(fragment);\n customElements.upgrade(fragment);\n }\n return fragment;\n }\n}\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n * @module lit-html\n */\n\nimport {reparentNodes} from './dom.js';\nimport {TemplateProcessor} from './template-processor.js';\nimport {boundAttributeSuffix, lastAttributeNameRegex, marker, nodeMarker} from './template.js';\n\ndeclare const trustedTypes: typeof window.trustedTypes;\n/**\n * Our TrustedTypePolicy for HTML which is declared using the html template\n * tag function.\n *\n * That HTML is a developer-authored constant, and is parsed with innerHTML\n * before any untrusted expressions have been mixed in. Therefor it is\n * considered safe by construction.\n */\nconst policy = window.trustedTypes &&\n trustedTypes!.createPolicy('lit-html', {createHTML: (s) => s});\n\nconst commentMarker = ` ${marker} `;\n\n/**\n * The return type of `html`, which holds a Template and the values from\n * interpolated expressions.\n */\nexport class TemplateResult {\n readonly strings: TemplateStringsArray;\n readonly values: readonly unknown[];\n readonly type: string;\n readonly processor: TemplateProcessor;\n\n constructor(\n strings: TemplateStringsArray, values: readonly unknown[], type: string,\n processor: TemplateProcessor) {\n this.strings = strings;\n this.values = values;\n this.type = type;\n this.processor = processor;\n }\n\n /**\n * Returns a string of HTML used to create a `<template>` element.\n */\n getHTML(): string {\n const l = this.strings.length - 1;\n let html = '';\n let isCommentBinding = false;\n\n for (let i = 0; i < l; i++) {\n const s = this.strings[i];\n // For each binding we want to determine the kind of marker to insert\n // into the template source before it's parsed by the browser's HTML\n // parser. The marker type is based on whether the expression is in an\n // attribute, text, or comment position.\n // * For node-position bindings we insert a comment with the marker\n // sentinel as its text content, like <!--{{lit-guid}}-->.\n // * For attribute bindings we insert just the marker sentinel for the\n // first binding, so that we support unquoted attribute bindings.\n // Subsequent bindings can use a comment marker because multi-binding\n // attributes must be quoted.\n // * For comment bindings we insert just the marker sentinel so we don't\n // close the comment.\n //\n // The following code scans the template source, but is *not* an HTML\n // parser. We don't need to track the tree structure of the HTML, only\n // whether a binding is inside a comment, and if not, if it appears to be\n // the first binding in an attribute.\n const commentOpen = s.lastIndexOf('<!--');\n // We're in comment position if we have a comment open with no following\n // comment close. Because <-- can appear in an attribute value there can\n // be false positives.\n isCommentBinding = (commentOpen > -1 || isCommentBinding) &&\n s.indexOf('-->', commentOpen + 1) === -1;\n // Check to see if we have an attribute-like sequence preceding the\n // expression. This can match \"name=value\" like structures in text,\n // comments, and attribute values, so there can be false-positives.\n const attributeMatch = lastAttributeNameRegex.exec(s);\n if (attributeMatch === null) {\n // We're only in this branch if we don't have a attribute-like\n // preceding sequence. For comments, this guards against unusual\n // attribute values like <div foo=\"<!--${'bar'}\">. Cases like\n // <!-- foo=${'bar'}--> are handled correctly in the attribute branch\n // below.\n html += s + (isCommentBinding ? commentMarker : nodeMarker);\n } else {\n // For attributes we use just a marker sentinel, and also append a\n // $lit$ suffix to the name to opt-out of attribute-specific parsing\n // that IE and Edge do for style and certain SVG attributes.\n html += s.substr(0, attributeMatch.index) + attributeMatch[1] +\n attributeMatch[2] + boundAttributeSuffix + attributeMatch[3] +\n marker;\n }\n }\n html += this.strings[l];\n return html;\n }\n\n getTemplateElement(): HTMLTemplateElement {\n const template = document.createElement('template');\n let value = this.getHTML();\n if (policy !== undefined) {\n // this is secure because `this.strings` is a TemplateStringsArray.\n // TODO: validate this when\n // https://github.com/tc39/proposal-array-is-template-object is\n // implemented.\n value = policy.createHTML(value) as unknown as string;\n }\n template.innerHTML = value;\n return template;\n }\n}\n\n/**\n * A TemplateResult for SVG fragments.\n *\n * This class wraps HTML in an `<svg>` tag in order to parse its contents in the\n * SVG namespace, then modifies the template to remove the `<svg>` tag so that\n * clones only container the original fragment.\n */\nexport class SVGTemplateResult extends TemplateResult {\n getHTML(): string {\n return `<svg>${super.getHTML()}</svg>`;\n }\n\n getTemplateElement(): HTMLTemplateElement {\n const template = super.getTemplateElement();\n const content = template.content;\n const svgElement = content.firstChild!;\n content.removeChild(svgElement);\n reparentNodes(content, svgElement.firstChild);\n return template;\n }\n}\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {isDirective} from './directive.js';\nimport {removeNodes} from './dom.js';\nimport {noChange, nothing, Part} from './part.js';\nimport {RenderOptions} from './render-options.js';\nimport {TemplateInstance} from './template-instance.js';\nimport {TemplateResult} from './template-result.js';\nimport {createMarker} from './template.js';\n\n// https://tc39.github.io/ecma262/#sec-typeof-operator\nexport type Primitive = null|undefined|boolean|number|string|symbol|bigint;\nexport const isPrimitive = (value: unknown): value is Primitive => {\n return (\n value === null ||\n !(typeof value === 'object' || typeof value === 'function'));\n};\nexport const isIterable = (value: unknown): value is Iterable<unknown> => {\n return Array.isArray(value) ||\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n !!(value && (value as any)[Symbol.iterator]);\n};\n\n/**\n * Writes attribute values to the DOM for a group of AttributeParts bound to a\n * single attribute. The value is only set once even if there are multiple parts\n * for an attribute.\n */\nexport class AttributeCommitter {\n readonly element: Element;\n readonly name: string;\n readonly strings: ReadonlyArray<string>;\n readonly parts: ReadonlyArray<AttributePart>;\n dirty = true;\n\n constructor(element: Element, name: string, strings: ReadonlyArray<string>) {\n this.element = element;\n this.name = name;\n this.strings = strings;\n this.parts = [];\n for (let i = 0; i < strings.length - 1; i++) {\n (this.parts as AttributePart[])[i] = this._createPart();\n }\n }\n\n /**\n * Creates a single part. Override this to create a differnt type of part.\n */\n protected _createPart(): AttributePart {\n return new AttributePart(this);\n }\n\n protected _getValue(): unknown {\n const strings = this.strings;\n const l = strings.length - 1;\n const parts = this.parts;\n\n // If we're assigning an attribute via syntax like:\n // attr=\"${foo}\" or attr=${foo}\n // but not\n // attr=\"${foo} ${bar}\" or attr=\"${foo} baz\"\n // then we don't want to coerce the attribute value into one long\n // string. Instead we want to just return the value itself directly,\n // so that sanitizeDOMValue can get the actual value rather than\n // String(value)\n // The exception is if v is an array, in which case we do want to smash\n // it together into a string without calling String() on the array.\n //\n // This also allows trusted values (when using TrustedTypes) being\n // assigned to DOM sinks without being stringified in the process.\n if (l === 1 && strings[0] === '' && strings[1] === '') {\n const v = parts[0].value;\n if (typeof v === 'symbol') {\n return String(v);\n }\n if (typeof v === 'string' || !isIterable(v)) {\n return v;\n }\n }\n let text = '';\n\n for (let i = 0; i < l; i++) {\n text += strings[i];\n const part = parts[i];\n if (part !== undefined) {\n const v = part.value;\n if (isPrimitive(v) || !isIterable(v)) {\n text += typeof v === 'string' ? v : String(v);\n } else {\n for (const t of v) {\n text += typeof t === 'string' ? t : String(t);\n }\n }\n }\n }\n\n text += strings[l];\n return text;\n }\n\n commit(): void {\n if (this.dirty) {\n this.dirty = false;\n this.element.setAttribute(this.name, this._getValue() as string);\n }\n }\n}\n\n/**\n * A Part that controls all or part of an attribute value.\n */\nexport class AttributePart implements Part {\n readonly committer: AttributeCommitter;\n value: unknown = undefined;\n\n constructor(committer: AttributeCommitter) {\n this.committer = committer;\n }\n\n setValue(value: unknown): void {\n if (value !== noChange && (!isPrimitive(value) || value !== this.value)) {\n this.value = value;\n // If the value is a not a directive, dirty the committer so that it'll\n // call setAttribute. If the value is a directive, it'll dirty the\n // committer if it calls setValue().\n if (!isDirective(value)) {\n this.committer.dirty = true;\n }\n }\n }\n\n commit() {\n while (isDirective(this.value)) {\n const directive = this.value;\n this.value = noChange;\n directive(this);\n }\n if (this.value === noChange) {\n return;\n }\n this.committer.commit();\n }\n}\n\n/**\n * A Part that controls a location within a Node tree. Like a Range, NodePart\n * has start and end locations and can set and update the Nodes between those\n * locations.\n *\n * NodeParts support several value types: primitives, Nodes, TemplateResults,\n * as well as arrays and iterables of those types.\n */\nexport class NodePart implements Part {\n readonly options: RenderOptions;\n startNode!: Node;\n endNode!: Node;\n value: unknown = undefined;\n private __pendingValue: unknown = undefined;\n\n constructor(options: RenderOptions) {\n this.options = options;\n }\n\n /**\n * Appends this part into a container.\n *\n * This part must be empty, as its contents are not automatically moved.\n */\n appendInto(container: Node) {\n this.startNode = container.appendChild(createMarker());\n this.endNode = container.appendChild(createMarker());\n }\n\n /**\n * Inserts this part after the `ref` node (between `ref` and `ref`'s next\n * sibling). Both `ref` and its next sibling must be static, unchanging nodes\n * such as those that appear in a literal section of a template.\n *\n * This part must be empty, as its contents are not automatically moved.\n */\n insertAfterNode(ref: Node) {\n this.startNode = ref;\n this.endNode = ref.nextSibling!;\n }\n\n /**\n * Appends this part into a parent part.\n *\n * This part must be empty, as its contents are not automatically moved.\n */\n appendIntoPart(part: NodePart) {\n part.__insert(this.startNode = createMarker());\n part.__insert(this.endNode = createMarker());\n }\n\n /**\n * Inserts this part after the `ref` part.\n *\n * This part must be empty, as its contents are not automatically moved.\n */\n insertAfterPart(ref: NodePart) {\n ref.__insert(this.startNode = createMarker());\n this.endNode = ref.endNode;\n ref.endNode = this.startNode;\n }\n\n setValue(value: unknown): void {\n this.__pendingValue = value;\n }\n\n commit() {\n if (this.startNode.parentNode === null) {\n return;\n }\n while (isDirective(this.__pendingValue)) {\n const directive = this.__pendingValue;\n this.__pendingValue = noChange;\n directive(this);\n }\n const value = this.__pendingValue;\n if (value === noChange) {\n return;\n }\n if (isPrimitive(value)) {\n if (value !== this.value) {\n this.__commitText(value);\n }\n } else if (value instanceof TemplateResult) {\n this.__commitTemplateResult(value);\n } else if (value instanceof Node) {\n this.__commitNode(value);\n } else if (isIterable(value)) {\n this.__commitIterable(value);\n } else if (value === nothing) {\n this.value = nothing;\n this.clear();\n } else {\n // Fallback, will render the string representation\n this.__commitText(value);\n }\n }\n\n private __insert(node: Node) {\n this.endNode.parentNode!.insertBefore(node, this.endNode);\n }\n\n private __commitNode(value: Node): void {\n if (this.value === value) {\n return;\n }\n this.clear();\n this.__insert(value);\n this.value = value;\n }\n\n private __commitText(value: unknown): void {\n const node = this.startNode.nextSibling!;\n value = value == null ? '' : value;\n // If `value` isn't already a string, we explicitly convert it here in case\n // it can't be implicitly converted - i.e. it's a symbol.\n const valueAsString: string =\n typeof value === 'string' ? value : String(value);\n if (node === this.endNode.previousSibling &&\n node.nodeType === 3 /* Node.TEXT_NODE */) {\n // If we only have a single text node between the markers, we can just\n // set its value, rather than replacing it.\n // TODO(justinfagnani): Can we just check if this.value is primitive?\n (node as Text).data = valueAsString;\n } else {\n this.__commitNode(document.createTextNode(valueAsString));\n }\n this.value = value;\n }\n\n private __commitTemplateResult(value: TemplateResult): void {\n const template = this.options.templateFactory(value);\n if (this.value instanceof TemplateInstance &&\n this.value.template === template) {\n this.value.update(value.values);\n } else {\n // Make sure we propagate the template processor from the TemplateResult\n // so that we use its syntax extension, etc. The template factory comes\n // from the render function options so that it can control template\n // caching and preprocessing.\n const instance =\n new TemplateInstance(template, value.processor, this.options);\n const fragment = instance._clone();\n instance.update(value.values);\n this.__commitNode(fragment);\n this.value = instance;\n }\n }\n\n private __commitIterable(value: Iterable<unknown>): void {\n // For an Iterable, we create a new InstancePart per item, then set its\n // value to the item. This is a little bit of overhead for every item in\n // an Iterable, but it lets us recurse easily and efficiently update Arrays\n // of TemplateResults that will be commonly returned from expressions like:\n // array.map((i) => html`${i}`), by reusing existing TemplateInstances.\n\n // If _value is an array, then the previous render was of an\n // iterable and _value will contain the NodeParts from the previous\n // render. If _value is not an array, clear this part and make a new\n // array for NodeParts.\n if (!Array.isArray(this.value)) {\n this.value = [];\n this.clear();\n }\n\n // Lets us keep track of how many items we stamped so we can clear leftover\n // items from a previous render\n const itemParts = this.value as NodePart[];\n let partIndex = 0;\n let itemPart: NodePart|undefined;\n\n for (const item of value) {\n // Try to reuse an existing part\n itemPart = itemParts[partIndex];\n\n // If no existing part, create a new one\n if (itemPart === undefined) {\n itemPart = new NodePart(this.options);\n itemParts.push(itemPart);\n if (partIndex === 0) {\n itemPart.appendIntoPart(this);\n } else {\n itemPart.insertAfterPart(itemParts[partIndex - 1]);\n }\n }\n itemPart.setValue(item);\n itemPart.commit();\n partIndex++;\n }\n\n if (partIndex < itemParts.length) {\n // Truncate the parts array so _value reflects the current state\n itemParts.length = partIndex;\n this.clear(itemPart && itemPart.endNode);\n }\n }\n\n clear(startNode: Node = this.startNode) {\n removeNodes(\n this.startNode.parentNode!, startNode.nextSibling!, this.endNode);\n }\n}\n\n/**\n * Implements a boolean attribute, roughly as defined in the HTML\n * specification.\n *\n * If the value is truthy, then the attribute is present with a value of\n * ''. If the value is falsey, the attribute is removed.\n */\nexport class BooleanAttributePart implements Part {\n readonly element: Element;\n readonly name: string;\n readonly strings: readonly string[];\n value: unknown = undefined;\n private __pendingValue: unknown = undefined;\n\n constructor(element: Element, name: string, strings: readonly string[]) {\n if (strings.length !== 2 || strings[0] !== '' || strings[1] !== '') {\n throw new Error(\n 'Boolean attributes can only contain a single expression');\n }\n this.element = element;\n this.name = name;\n this.strings = strings;\n }\n\n setValue(value: unknown): void {\n this.__pendingValue = value;\n }\n\n commit() {\n while (isDirective(this.__pendingValue)) {\n const directive = this.__pendingValue;\n this.__pendingValue = noChange;\n directive(this);\n }\n if (this.__pendingValue === noChange) {\n return;\n }\n const value = !!this.__pendingValue;\n if (this.value !== value) {\n if (value) {\n this.element.setAttribute(this.name, '');\n } else {\n this.element.removeAttribute(this.name);\n }\n this.value = value;\n }\n this.__pendingValue = noChange;\n }\n}\n\n/**\n * Sets attribute values for PropertyParts, so that the value is only set once\n * even if there are multiple parts for a property.\n *\n * If an expression controls the whole property value, then the value is simply\n * assigned to the property under control. If there are string literals or\n * multiple expressions, then the strings are expressions are interpolated into\n * a string first.\n */\nexport class PropertyCommitter extends AttributeCommitter {\n readonly single: boolean;\n\n constructor(element: Element, name: string, strings: ReadonlyArray<string>) {\n super(element, name, strings);\n this.single =\n (strings.length === 2 && strings[0] === '' && strings[1] === '');\n }\n\n protected _createPart(): PropertyPart {\n return new PropertyPart(this);\n }\n\n protected _getValue() {\n if (this.single) {\n return this.parts[0].value;\n }\n return super._getValue();\n }\n\n commit(): void {\n if (this.dirty) {\n this.dirty = false;\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (this.element as any)[this.name] = this._getValue();\n }\n }\n}\n\nexport class PropertyPart extends AttributePart {}\n\n// Detect event listener options support. If the `capture` property is read\n// from the options object, then options are supported. If not, then the third\n// argument to add/removeEventListener is interpreted as the boolean capture\n// value so we should only pass the `capture` property.\nlet eventOptionsSupported = false;\n\n// Wrap into an IIFE because MS Edge <= v41 does not support having try/catch\n// blocks right into the body of a module\n(() => {\n try {\n const options = {\n get capture() {\n eventOptionsSupported = true;\n return false;\n }\n };\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n window.addEventListener('test', options as any, options);\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n window.removeEventListener('test', options as any, options);\n } catch (_e) {\n // event options not supported\n }\n})();\n\ntype EventHandlerWithOptions =\n EventListenerOrEventListenerObject&Partial<AddEventListenerOptions>;\nexport class EventPart implements Part {\n readonly element: Element;\n readonly eventName: string;\n readonly eventContext?: EventTarget;\n value: undefined|EventHandlerWithOptions = undefined;\n private __options?: AddEventListenerOptions;\n private __pendingValue: undefined|EventHandlerWithOptions = undefined;\n private readonly __boundHandleEvent: (event: Event) => void;\n\n constructor(element: Element, eventName: string, eventContext?: EventTarget) {\n this.element = element;\n this.eventName = eventName;\n this.eventContext = eventContext;\n this.__boundHandleEvent = (e) => this.handleEvent(e);\n }\n\n setValue(value: undefined|EventHandlerWithOptions): void {\n this.__pendingValue = value;\n }\n\n commit() {\n while (isDirective(this.__pendingValue)) {\n const directive = this.__pendingValue;\n this.__pendingValue = noChange as EventHandlerWithOptions;\n directive(this);\n }\n if (this.__pendingValue === noChange) {\n return;\n }\n\n const newListener = this.__pendingValue;\n const oldListener = this.value;\n const shouldRemoveListener = newListener == null ||\n oldListener != null &&\n (newListener.capture !== oldListener.capture ||\n newListener.once !== oldListener.once ||\n newListener.passive !== oldListener.passive);\n const shouldAddListener =\n newListener != null && (oldListener == null || shouldRemoveListener);\n\n if (shouldRemoveListener) {\n this.element.removeEventListener(\n this.eventName, this.__boundHandleEvent, this.__options);\n }\n if (shouldAddListener) {\n this.__options = getOptions(newListener);\n this.element.addEventListener(\n this.eventName, this.__boundHandleEvent, this.__options);\n }\n this.value = newListener;\n this.__pendingValue = noChange as EventHandlerWithOptions;\n }\n\n handleEvent(event: Event) {\n if (typeof this.value === 'function') {\n this.value.call(this.eventContext || this.element, event);\n } else {\n (this.value as EventListenerObject).handleEvent(event);\n }\n }\n}\n\n// We copy options because of the inconsistent behavior of browsers when reading\n// the third argument of add/removeEventListener. IE11 doesn't support options\n// at all. Chrome 41 only reads `capture` if the argument is an object.\nconst getOptions = (o: AddEventListenerOptions|undefined) => o &&\n (eventOptionsSupported ?\n {capture: o.capture, passive: o.passive, once: o.once} :\n o.capture as AddEventListenerOptions);\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {TemplateResult} from './template-result.js';\nimport {marker, Template} from './template.js';\n\n/**\n * A function type that creates a Template from a TemplateResult.\n *\n * This is a hook into the template-creation process for rendering that\n * requires some modification of templates before they're used, like ShadyCSS,\n * which must add classes to elements and remove styles.\n *\n * Templates should be cached as aggressively as possible, so that many\n * TemplateResults produced from the same expression only do the work of\n * creating the Template the first time.\n *\n * Templates are usually cached by TemplateResult.strings and\n * TemplateResult.type, but may be cached by other keys if this function\n * modifies the template.\n *\n * Note that currently TemplateFactories must not add, remove, or reorder\n * expressions, because there is no way to describe such a modification\n * to render() so that values are interpolated to the correct place in the\n * template instances.\n */\nexport type TemplateFactory = (result: TemplateResult) => Template;\n\n/**\n * The default TemplateFactory which caches Templates keyed on\n * result.type and result.strings.\n */\nexport function templateFactory(result: TemplateResult) {\n let templateCache = templateCaches.get(result.type);\n if (templateCache === undefined) {\n templateCache = {\n stringsArray: new WeakMap<TemplateStringsArray, Template>(),\n keyString: new Map<string, Template>()\n };\n templateCaches.set(result.type, templateCache);\n }\n\n let template = templateCache.stringsArray.get(result.strings);\n if (template !== undefined) {\n return template;\n }\n\n // If the TemplateStringsArray is new, generate a key from the strings\n // This key is shared between all templates with identical content\n const key = result.strings.join(marker);\n\n // Check if we already have a Template for this key\n template = templateCache.keyString.get(key);\n if (template === undefined) {\n // If we have not seen this key before, create a new Template\n template = new Template(result, result.getTemplateElement());\n // Cache the Template for this key\n templateCache.keyString.set(key, template);\n }\n\n // Cache all future queries for this TemplateStringsArray\n templateCache.stringsArray.set(result.strings, template);\n return template;\n}\n\n/**\n * The first argument to JS template tags retain identity across multiple\n * calls to a tag for the same literal, so we can cache work done per literal\n * in a Map.\n *\n * Safari currently has a bug which occasionally breaks this behavior, so we\n * need to cache the Template at two levels. We first cache the\n * TemplateStringsArray, and if that fails, we cache a key constructed by\n * joining the strings array.\n */\nexport interface TemplateCache {\n readonly stringsArray: WeakMap<TemplateStringsArray, Template>;\n readonly keyString: Map<string, Template>;\n}\n\nexport const templateCaches = new Map<string, TemplateCache>();\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {removeNodes} from './dom.js';\nimport {NodePart} from './parts.js';\nimport {RenderOptions} from './render-options.js';\nimport {templateFactory} from './template-factory.js';\n\nexport const parts = new WeakMap<Node, NodePart>();\n\n/**\n * Renders a template result or other value to a container.\n *\n * To update a container with new values, reevaluate the template literal and\n * call `render` with the new result.\n *\n * @param result Any value renderable by NodePart - typically a TemplateResult\n * created by evaluating a template tag like `html` or `svg`.\n * @param container A DOM parent to render to. The entire contents are either\n * replaced, or efficiently updated if the same result type was previous\n * rendered there.\n * @param options RenderOptions for the entire render tree rendered to this\n * container. Render options must *not* change between renders to the same\n * container, as those changes will not effect previously rendered DOM.\n */\nexport const render =\n (result: unknown,\n container: Element|DocumentFragment,\n options?: Partial<RenderOptions>) => {\n let part = parts.get(container);\n if (part === undefined) {\n removeNodes(container, container.firstChild);\n parts.set(container, part = new NodePart({\n templateFactory,\n ...options,\n }));\n part.appendInto(container);\n }\n part.setValue(result);\n part.commit();\n };\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {Part} from './part.js';\nimport {AttributeCommitter, BooleanAttributePart, EventPart, NodePart, PropertyCommitter} from './parts.js';\nimport {RenderOptions} from './render-options.js';\nimport {TemplateProcessor} from './template-processor.js';\n\n/**\n * Creates Parts when a template is instantiated.\n */\nexport class DefaultTemplateProcessor implements TemplateProcessor {\n /**\n * Create parts for an attribute-position binding, given the event, attribute\n * name, and string literals.\n *\n * @param element The element containing the binding\n * @param name The attribute name\n * @param strings The string literals. There are always at least two strings,\n * event for fully-controlled bindings with a single expression.\n */\n handleAttributeExpressions(\n element: Element, name: string, strings: string[],\n options: RenderOptions): ReadonlyArray<Part> {\n const prefix = name[0];\n if (prefix === '.') {\n const committer = new PropertyCommitter(element, name.slice(1), strings);\n return committer.parts;\n }\n if (prefix === '@') {\n return [new EventPart(element, name.slice(1), options.eventContext)];\n }\n if (prefix === '?') {\n return [new BooleanAttributePart(element, name.slice(1), strings)];\n }\n const committer = new AttributeCommitter(element, name, strings);\n return committer.parts;\n }\n /**\n * Create parts for a text-position binding.\n * @param templateFactory\n */\n handleTextExpression(options: RenderOptions) {\n return new NodePart(options);\n }\n}\n\nexport const defaultTemplateProcessor = new DefaultTemplateProcessor();\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n *\n * Main lit-html module.\n *\n * Main exports:\n *\n * - [[html]]\n * - [[svg]]\n * - [[render]]\n *\n * @packageDocumentation\n */\n\n/**\n * Do not remove this comment; it keeps typedoc from misplacing the module\n * docs.\n */\nimport {defaultTemplateProcessor} from './lib/default-template-processor.js';\nimport {SVGTemplateResult, TemplateResult} from './lib/template-result.js';\n\nexport {DefaultTemplateProcessor, defaultTemplateProcessor} from './lib/default-template-processor.js';\nexport {directive, DirectiveFn, isDirective} from './lib/directive.js';\n// TODO(justinfagnani): remove line when we get NodePart moving methods\nexport {removeNodes, reparentNodes} from './lib/dom.js';\nexport {noChange, nothing, Part} from './lib/part.js';\nexport {AttributeCommitter, AttributePart, BooleanAttributePart, EventPart, isIterable, isPrimitive, NodePart, PropertyCommitter, PropertyPart} from './lib/parts.js';\nexport {RenderOptions} from './lib/render-options.js';\nexport {parts, render} from './lib/render.js';\nexport {templateCaches, templateFactory} from './lib/template-factory.js';\nexport {TemplateInstance} from './lib/template-instance.js';\nexport {TemplateProcessor} from './lib/template-processor.js';\nexport {SVGTemplateResult, TemplateResult} from './lib/template-result.js';\nexport {createMarker, isTemplatePartActive, Template} from './lib/template.js';\n\ndeclare global {\n interface Window {\n litHtmlVersions: string[];\n }\n}\n\n// IMPORTANT: do not change the property name or the assignment expression.\n// This line will be used in regexes to search for lit-html usage.\n// TODO(justinfagnani): inject version number at build time\nif (typeof window !== 'undefined') {\n (window['litHtmlVersions'] || (window['litHtmlVersions'] = [])).push('1.4.1');\n}\n\n/**\n * Interprets a template literal as an HTML template that can efficiently\n * render to and update a container.\n */\nexport const html = (strings: TemplateStringsArray, ...values: unknown[]) =>\n new TemplateResult(strings, values, 'html', defaultTemplateProcessor);\n\n/**\n * Interprets a template literal as an SVG template that can efficiently\n * render to and update a container.\n */\nexport const svg = (strings: TemplateStringsArray, ...values: unknown[]) =>\n new SVGTemplateResult(strings, values, 'svg', defaultTemplateProcessor);\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n * Module to add shady DOM/shady CSS polyfill support to lit-html template\n * rendering. See the [[render]] method for details.\n *\n * @packageDocumentation\n */\n\n/**\n * Do not remove this comment; it keeps typedoc from misplacing the module\n * docs.\n */\nimport {removeNodes} from './dom.js';\nimport {insertNodeIntoTemplate, removeNodesFromTemplate} from './modify-template.js';\nimport {RenderOptions} from './render-options.js';\nimport {parts, render as litRender} from './render.js';\nimport {templateCaches} from './template-factory.js';\nimport {TemplateInstance} from './template-instance.js';\nimport {TemplateResult} from './template-result.js';\nimport {marker, Template} from './template.js';\n\nexport {html, svg, TemplateResult} from '../lit-html.js';\n\n// Get a key to lookup in `templateCaches`.\nconst getTemplateCacheKey = (type: string, scopeName: string) =>\n `${type}--${scopeName}`;\n\nlet compatibleShadyCSSVersion = true;\n\nif (typeof window.ShadyCSS === 'undefined') {\n compatibleShadyCSSVersion = false;\n} else if (typeof window.ShadyCSS.prepareTemplateDom === 'undefined') {\n console.warn(\n `Incompatible ShadyCSS version detected. ` +\n `Please update to at least @webcomponents/webcomponentsjs@2.0.2 and ` +\n `@webcomponents/shadycss@1.3.1.`);\n compatibleShadyCSSVersion = false;\n}\n\n/**\n * Template factory which scopes template DOM using ShadyCSS.\n * @param scopeName {string}\n */\nexport const shadyTemplateFactory = (scopeName: string) =>\n (result: TemplateResult) => {\n const cacheKey = getTemplateCacheKey(result.type, scopeName);\n let templateCache = templateCaches.get(cacheKey);\n if (templateCache === undefined) {\n templateCache = {\n stringsArray: new WeakMap<TemplateStringsArray, Template>(),\n keyString: new Map<string, Template>()\n };\n templateCaches.set(cacheKey, templateCache);\n }\n\n let template = templateCache.stringsArray.get(result.strings);\n if (template !== undefined) {\n return template;\n }\n\n const key = result.strings.join(marker);\n template = templateCache.keyString.get(key);\n if (template === undefined) {\n const element = result.getTemplateElement();\n if (compatibleShadyCSSVersion) {\n window.ShadyCSS!.prepareTemplateDom(element, scopeName);\n }\n template = new Template(result, element);\n templateCache.keyString.set(key, template);\n }\n templateCache.stringsArray.set(result.strings, template);\n return template;\n };\n\nconst TEMPLATE_TYPES = ['html', 'svg'];\n\n/**\n * Removes all style elements from Templates for the given scopeName.\n */\nconst removeStylesFromLitTemplates = (scopeName: string) => {\n TEMPLATE_TYPES.forEach((type) => {\n const templates = templateCaches.get(getTemplateCacheKey(type, scopeName));\n if (templates !== undefined) {\n templates.keyString.forEach((template) => {\n const {element: {content}} = template;\n // IE 11 doesn't support the iterable param Set constructor\n const styles = new Set<Element>();\n Array.from(content.querySelectorAll('style')).forEach((s: Element) => {\n styles.add(s);\n });\n removeNodesFromTemplate(template, styles);\n });\n }\n });\n};\n\nconst shadyRenderSet = new Set<string>();\n\n/**\n * For the given scope name, ensures that ShadyCSS style scoping is performed.\n * This is done just once per scope name so the fragment and template cannot\n * be modified.\n * (1) extracts styles from the rendered fragment and hands them to ShadyCSS\n * to be scoped and appended to the document\n * (2) removes style elements from all lit-html Templates for this scope name.\n *\n * Note, <style> elements can only be placed into templates for the\n * initial rendering of the scope. If <style> elements are included in templates\n * dynamically rendered to the scope (after the first scope render), they will\n * not be scoped and the <style> will be left in the template and rendered\n * output.\n */\nconst prepareTemplateStyles =\n (scopeName: string, renderedDOM: DocumentFragment, template?: Template) => {\n shadyRenderSet.add(scopeName);\n // If `renderedDOM` is stamped from a Template, then we need to edit that\n // Template's underlying template element. Otherwise, we create one here\n // to give to ShadyCSS, which still requires one while scoping.\n const templateElement =\n !!template ? template.element : document.createElement('template');\n // Move styles out of rendered DOM and store.\n const styles = renderedDOM.querySelectorAll('style');\n const {length} = styles;\n // If there are no styles, skip unnecessary work\n if (length === 0) {\n // Ensure prepareTemplateStyles is called to support adding\n // styles via `prepareAdoptedCssText` since that requires that\n // `prepareTemplateStyles` is called.\n //\n // ShadyCSS will only update styles containing @apply in the template\n // given to `prepareTemplateStyles`. If no lit Template was given,\n // ShadyCSS will not be able to update uses of @apply in any relevant\n // template. However, this is not a problem because we only create the\n // template for the purpose of supporting `prepareAdoptedCssText`,\n // which doesn't support @apply at all.\n window.ShadyCSS!.prepareTemplateStyles(templateElement, scopeName);\n return;\n }\n const condensedStyle = document.createElement('style');\n // Collect styles into a single style. This helps us make sure ShadyCSS\n // manipulations will not prevent us from being able to fix up template\n // part indices.\n // NOTE: collecting styles is inefficient for browsers but ShadyCSS\n // currently does this anyway. When it does not, this should be changed.\n for (let i = 0; i < length; i++) {\n const style = styles[i];\n style.parentNode!.removeChild(style);\n condensedStyle.textContent! += style.textContent;\n }\n // Remove styles from nested templates in this scope.\n removeStylesFromLitTemplates(scopeName);\n // And then put the condensed style into the \"root\" template passed in as\n // `template`.\n const content = templateElement.content;\n if (!!template) {\n insertNodeIntoTemplate(template, condensedStyle, content.firstChild);\n } else {\n content.insertBefore(condensedStyle, content.firstChild);\n }\n // Note, it's important that ShadyCSS gets the template that `lit-html`\n // will actually render so that it can update the style inside when\n // needed (e.g. @apply native Shadow DOM case).\n window.ShadyCSS!.prepareTemplateStyles(templateElement, scopeName);\n const style = content.querySelector('style');\n if (window.ShadyCSS!.nativeShadow && style !== null) {\n // When in native Shadow DOM, ensure the style created by ShadyCSS is\n // included in initially rendered output (`renderedDOM`).\n renderedDOM.insertBefore(style.cloneNode(true), renderedDOM.firstChild);\n } else if (!!template) {\n // When no style is left in the template, parts will be broken as a\n // result. To fix this, we put back the style node ShadyCSS removed\n // and then tell lit to remove that node from the template.\n // There can be no style in the template in 2 cases (1) when Shady DOM\n // is in use, ShadyCSS removes all styles, (2) when native Shadow DOM\n // is in use ShadyCSS removes the style if it contains no content.\n // NOTE, ShadyCSS creates its own style so we can safely add/remove\n // `condensedStyle` here.\n content.insertBefore(condensedStyle, content.firstChild);\n const removes = new Set<Node>();\n removes.add(condensedStyle);\n removeNodesFromTemplate(template, removes);\n }\n };\n\nexport interface ShadyRenderOptions extends Partial<RenderOptions> {\n scopeName: string;\n}\n\n/**\n * Extension to the standard `render` method which supports rendering\n * to ShadowRoots when the ShadyDOM (https://github.com/webcomponents/shadydom)\n * and ShadyCSS (https://github.com/webcomponents/shadycss) polyfills are used\n * or when the webcomponentsjs\n * (https://github.com/webcomponents/webcomponentsjs) polyfill is used.\n *\n * Adds a `scopeName` option which is used to scope element DOM and stylesheets\n * when native ShadowDOM is unavailable. The `scopeName` will be added to\n * the class attribute of all rendered DOM. In addition, any style elements will\n * be automatically re-written with this `scopeName` selector and moved out\n * of the rendered DOM and into the document `<head>`.\n *\n * It is common to use this render method in conjunction with a custom element\n * which renders a shadowRoot. When this is done, typically the element's\n * `localName` should be used as the `scopeName`.\n *\n * In addition to DOM scoping, ShadyCSS also supports a basic shim for css\n * custom properties (needed only on older browsers like IE11) and a shim for\n * a deprecated feature called `@apply` that supports applying a set of css\n * custom properties to a given location.\n *\n * Usage considerations:\n *\n * * Part values in `<style>` elements are only applied the first time a given\n * `scopeName` renders. Subsequent changes to parts in style elements will have\n * no effect. Because of this, parts in style elements should only be used for\n * values that will never change, for example parts that set scope-wide theme\n * values or parts which render shared style elements.\n *\n * * Note, due to a limitation of the ShadyDOM polyfill, rendering in a\n * custom element's `constructor` is not supported. Instead rendering should\n * either done asynchronously, for example at microtask timing (for example\n * `Promise.resolve()`), or be deferred until the first time the element's\n * `connectedCallback` runs.\n *\n * Usage considerations when using shimmed custom properties or `@apply`:\n *\n * * Whenever any dynamic changes are made which affect\n * css custom properties, `ShadyCSS.styleElement(element)` must be called\n * to update the element. There are two cases when this is needed:\n * (1) the element is connected to a new parent, (2) a class is added to the\n * element that causes it to match different custom properties.\n * To address the first case when rendering a custom element, `styleElement`\n * should be called in the element's `connectedCallback`.\n *\n * * Shimmed custom properties may only be defined either for an entire\n * shadowRoot (for example, in a `:host` rule) or via a rule that directly\n * matches an element with a shadowRoot. In other words, instead of flowing from\n * parent to child as do native css custom properties, shimmed custom properties\n * flow only from shadowRoots to nested shadowRoots.\n *\n * * When using `@apply` mixing css shorthand property names with\n * non-shorthand names (for example `border` and `border-width`) is not\n * supported.\n */\nexport const render =\n (result: unknown,\n container: Element|DocumentFragment|ShadowRoot,\n options: ShadyRenderOptions) => {\n if (!options || typeof options !== 'object' || !options.scopeName) {\n throw new Error('The `scopeName` option is required.');\n }\n const scopeName = options.scopeName;\n const hasRendered = parts.has(container);\n const needsScoping = compatibleShadyCSSVersion &&\n container.nodeType === 11 /* Node.DOCUMENT_FRAGMENT_NODE */ &&\n !!(container as ShadowRoot).host;\n // Handle first render to a scope specially...\n const firstScopeRender = needsScoping && !shadyRenderSet.has(scopeName);\n // On first scope render, render into a fragment; this cannot be a single\n // fragment that is reused since nested renders can occur synchronously.\n const renderContainer =\n firstScopeRender ? document.createDocumentFragment() : container;\n litRender(\n result,\n renderContainer,\n {templateFactory: shadyTemplateFactory(scopeName), ...options} as\n RenderOptions);\n // When performing first scope render,\n // (1) We've rendered into a fragment so that there's a chance to\n // `prepareTemplateStyles` before sub-elements hit the DOM\n // (which might cause them to render based on a common pattern of\n // rendering in a custom element's `connectedCallback`);\n // (2) Scope the template with ShadyCSS one time only for this scope.\n // (3) Render the fragment into the container and make sure the\n // container knows its `part` is the one we just rendered. This ensures\n // DOM will be re-used on subsequent renders.\n if (firstScopeRender) {\n const part = parts.get(renderContainer)!;\n parts.delete(renderContainer);\n // ShadyCSS might have style sheets (e.g. from `prepareAdoptedCssText`)\n // that should apply to `renderContainer` even if the rendered value is\n // not a TemplateInstance. However, it will only insert scoped styles\n // into the document if `prepareTemplateStyles` has already been called\n // for the given scope name.\n const template = part.value instanceof TemplateInstance ?\n part.value.template :\n undefined;\n prepareTemplateStyles(\n scopeName, renderContainer as DocumentFragment, template);\n removeNodes(container, container.firstChild);\n container.appendChild(renderContainer);\n parts.set(container, part);\n }\n // After elements have hit the DOM, update styling if this is the\n // initial render to this container.\n // This is needed whenever dynamic changes are made so it would be\n // safest to do every render; however, this would regress performance\n // so we leave it up to the user to call `ShadyCSS.styleElement`\n // for dynamic changes.\n if (!hasRendered && needsScoping) {\n window.ShadyCSS!.styleElement((container as ShadowRoot).host);\n }\n };\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n * Use this module if you want to create your own base class extending\n * [[UpdatingElement]].\n * @packageDocumentation\n */\n\n/*\n * When using Closure Compiler, JSCompiler_renameProperty(property, object) is\n * replaced at compile time by the munged name for object[property]. We cannot\n * alias this function, so we have to use a small shim that has the same\n * behavior when not compiling.\n */\nwindow.JSCompiler_renameProperty =\n <P extends PropertyKey>(prop: P, _obj: unknown): P => prop;\n\ndeclare global {\n var JSCompiler_renameProperty: <P extends PropertyKey>(\n prop: P, _obj: unknown) => P;\n\n interface Window {\n JSCompiler_renameProperty: typeof JSCompiler_renameProperty;\n }\n}\n\n/**\n * Converts property values to and from attribute values.\n */\nexport interface ComplexAttributeConverter<Type = unknown, TypeHint = unknown> {\n /**\n * Function called to convert an attribute value to a property\n * value.\n */\n fromAttribute?(value: string|null, type?: TypeHint): Type;\n\n /**\n * Function called to convert a property value to an attribute\n * value.\n *\n * It returns unknown instead of string, to be compatible with\n * https://github.com/WICG/trusted-types (and similar efforts).\n */\n toAttribute?(value: Type, type?: TypeHint): unknown;\n}\n\ntype AttributeConverter<Type = unknown, TypeHint = unknown> =\n ComplexAttributeConverter<Type>|\n ((value: string|null, type?: TypeHint) => Type);\n\n/**\n * Defines options for a property accessor.\n */\nexport interface PropertyDeclaration<Type = unknown, TypeHint = unknown> {\n /**\n * Indicates how and whether the property becomes an observed attribute.\n * If the value is `false`, the property is not added to `observedAttributes`.\n * If true or absent, the lowercased property name is observed (e.g. `fooBar`\n * becomes `foobar`). If a string, the string value is observed (e.g\n * `attribute: 'foo-bar'`).\n */\n readonly attribute?: boolean|string;\n\n /**\n * Indicates the type of the property. This is used only as a hint for the\n * `converter` to determine how to convert the attribute\n * to/from a property.\n */\n readonly type?: TypeHint;\n\n /**\n * Indicates how to convert the attribute to/from a property. If this value\n * is a function, it is used to convert the attribute value a the property\n * value. If it's an object, it can have keys for `fromAttribute` and\n * `toAttribute`. If no `toAttribute` function is provided and\n * `reflect` is set to `true`, the property value is set directly to the\n * attribute. A default `converter` is used if none is provided; it supports\n * `Boolean`, `String`, `Number`, `Object`, and `Array`. Note,\n * when a property changes and the converter is used to update the attribute,\n * the property is never updated again as a result of the attribute changing,\n * and vice versa.\n */\n readonly converter?: AttributeConverter<Type, TypeHint>;\n\n /**\n * Indicates if the property should reflect to an attribute.\n * If `true`, when the property is set, the attribute is set using the\n * attribute name determined according to the rules for the `attribute`\n * property option and the value of the property converted using the rules\n * from the `converter` property option.\n */\n readonly reflect?: boolean;\n\n /**\n * A function that indicates if a property should be considered changed when\n * it is set. The function should take the `newValue` and `oldValue` and\n * return `true` if an update should be requested.\n */\n hasChanged?(value: Type, oldValue: Type): boolean;\n\n /**\n * Indicates whether an accessor will be created for this property. By\n * default, an accessor will be generated for this property that requests an\n * update when set. If this flag is `true`, no accessor will be created, and\n * it will be the user's responsibility to call\n * `this.requestUpdate(propertyName, oldValue)` to request an update when\n * the property changes.\n */\n readonly noAccessor?: boolean;\n}\n\n/**\n * Map of properties to PropertyDeclaration options. For each property an\n * accessor is made, and the property is processed according to the\n * PropertyDeclaration options.\n */\nexport interface PropertyDeclarations {\n readonly [key: string]: PropertyDeclaration;\n}\n\ntype PropertyDeclarationMap = Map<PropertyKey, PropertyDeclaration>;\n\ntype AttributeMap = Map<string, PropertyKey>;\n\n/**\n * Map of changed properties with old values. Takes an optional generic\n * interface corresponding to the declared element properties.\n */\n// tslint:disable-next-line:no-any\nexport type PropertyValues<T = any> =\n keyof T extends PropertyKey ? Map<keyof T, unknown>: never;\n\nexport const defaultConverter: ComplexAttributeConverter = {\n\n toAttribute(value: unknown, type?: unknown): unknown {\n switch (type) {\n case Boolean:\n return value ? '' : null;\n case Object:\n case Array:\n // if the value is `null` or `undefined` pass this through\n // to allow removing/no change behavior.\n return value == null ? value : JSON.stringify(value);\n }\n return value;\n },\n\n fromAttribute(value: string|null, type?: unknown) {\n switch (type) {\n case Boolean:\n return value !== null;\n case Number:\n return value === null ? null : Number(value);\n case Object:\n case Array:\n // Type assert to adhere to Bazel's \"must type assert JSON parse\" rule.\n return JSON.parse(value!) as unknown;\n }\n return value;\n }\n\n};\n\nexport interface HasChanged {\n (value: unknown, old: unknown): boolean;\n}\n\n/**\n * Change function that returns true if `value` is different from `oldValue`.\n * This method is used as the default for a property's `hasChanged` function.\n */\nexport const notEqual: HasChanged = (value: unknown, old: unknown): boolean => {\n // This ensures (old==NaN, value==NaN) always returns false\n return old !== value && (old === old || value === value);\n};\n\nconst defaultPropertyDeclaration: PropertyDeclaration = {\n attribute: true,\n type: String,\n converter: defaultConverter,\n reflect: false,\n hasChanged: notEqual\n};\n\nconst STATE_HAS_UPDATED = 1;\nconst STATE_UPDATE_REQUESTED = 1 << 2;\nconst STATE_IS_REFLECTING_TO_ATTRIBUTE = 1 << 3;\nconst STATE_IS_REFLECTING_TO_PROPERTY = 1 << 4;\ntype UpdateState = typeof STATE_HAS_UPDATED|typeof STATE_UPDATE_REQUESTED|\n typeof STATE_IS_REFLECTING_TO_ATTRIBUTE|\n typeof STATE_IS_REFLECTING_TO_PROPERTY;\n\n/**\n * The Closure JS Compiler doesn't currently have good support for static\n * property semantics where \"this\" is dynamic (e.g.\n * https://github.com/google/closure-compiler/issues/3177 and others) so we use\n * this hack to bypass any rewriting by the compiler.\n */\nconst finalized = 'finalized';\n\n/**\n * Base element class which manages element properties and attributes. When\n * properties change, the `update` method is asynchronously called. This method\n * should be supplied by subclassers to render updates as desired.\n * @noInheritDoc\n */\nexport abstract class UpdatingElement extends HTMLElement {\n /*\n * Due to closure compiler ES6 compilation bugs, @nocollapse is required on\n * all static methods and properties with initializers. Reference:\n * - https://github.com/google/closure-compiler/issues/1776\n */\n\n /**\n * Maps attribute names to properties; for example `foobar` attribute to\n * `fooBar` property. Created lazily on user subclasses when finalizing the\n * class.\n */\n private static _attributeToPropertyMap: AttributeMap;\n\n /**\n * Marks class as having finished creating properties.\n */\n protected static[finalized] = true;\n\n /**\n * Memoized list of all class properties, including any superclass properties.\n * Created lazily on user subclasses when finalizing the class.\n */\n private static _classProperties?: PropertyDeclarationMap;\n\n /**\n * User-supplied object that maps property names to `PropertyDeclaration`\n * objects containing options for configuring the property.\n */\n static properties: PropertyDeclarations;\n\n /**\n * Returns a list of attributes corresponding to the registered properties.\n * @nocollapse\n */\n static get observedAttributes() {\n // note: piggy backing on this to ensure we're finalized.\n this.finalize();\n const attributes: string[] = [];\n // Use forEach so this works even if for/of loops are compiled to for loops\n // expecting arrays\n this._classProperties!.forEach((v, p) => {\n const attr = this._attributeNameForProperty(p, v);\n if (attr !== undefined) {\n this._attributeToPropertyMap.set(attr, p);\n attributes.push(attr);\n }\n });\n return attributes;\n }\n\n /**\n * Ensures the private `_classProperties` property metadata is created.\n * In addition to `finalize` this is also called in `createProperty` to\n * ensure the `@property` decorator can add property metadata.\n */\n /** @nocollapse */\n private static _ensureClassProperties() {\n // ensure private storage for property declarations.\n if (!this.hasOwnProperty(\n JSCompiler_renameProperty('_classProperties', this))) {\n this._classProperties = new Map();\n // NOTE: Workaround IE11 not supporting Map constructor argument.\n const superProperties: PropertyDeclarationMap =\n Object.getPrototypeOf(this)._classProperties;\n if (superProperties !== undefined) {\n superProperties.forEach(\n (v: PropertyDeclaration, k: PropertyKey) =>\n this._classProperties!.set(k, v));\n }\n }\n }\n\n /**\n * Creates a property accessor on the element prototype if one does not exist\n * and stores a PropertyDeclaration for the property with the given options.\n * The property setter calls the property's `hasChanged` property option\n * or uses a strict identity check to determine whether or not to request\n * an update.\n *\n * This method may be overridden to customize properties; however,\n * when doing so, it's important to call `super.createProperty` to ensure\n * the property is setup correctly. This method calls\n * `getPropertyDescriptor` internally to get a descriptor to install.\n * To customize what properties do when they are get or set, override\n * `getPropertyDescriptor`. To customize the options for a property,\n * implement `createProperty` like this:\n *\n * static createProperty(name, options) {\n * options = Object.assign(options, {myOption: true});\n * super.createProperty(name, options);\n * }\n *\n * @nocollapse\n */\n static createProperty(\n name: PropertyKey,\n options: PropertyDeclaration = defaultPropertyDeclaration) {\n // Note, since this can be called by the `@property` decorator which\n // is called before `finalize`, we ensure storage exists for property\n // metadata.\n this._ensureClassProperties();\n this._classProperties!.set(name, options);\n // Do not generate an accessor if the prototype already has one, since\n // it would be lost otherwise and that would never be the user's intention;\n // Instead, we expect users to call `requestUpdate` themselves from\n // user-defined accessors. Note that if the super has an accessor we will\n // still overwrite it\n if (options.noAccessor || this.prototype.hasOwnProperty(name)) {\n return;\n }\n const key = typeof name === 'symbol' ? Symbol() : `__${name}`;\n const descriptor = this.getPropertyDescriptor(name, key, options);\n if (descriptor !== undefined) {\n Object.defineProperty(this.prototype, name, descriptor);\n }\n }\n\n /**\n * Returns a property descriptor to be defined on the given named property.\n * If no descriptor is returned, the property will not become an accessor.\n * For example,\n *\n * class MyElement extends LitElement {\n * static getPropertyDescriptor(name, key, options) {\n * const defaultDescriptor =\n * super.getPropertyDescriptor(name, key, options);\n * const setter = defaultDescriptor.set;\n * return {\n * get: defaultDescriptor.get,\n * set(value) {\n * setter.call(this, value);\n * // custom action.\n * },\n * configurable: true,\n * enumerable: true\n * }\n * }\n * }\n *\n * @nocollapse\n */\n protected static getPropertyDescriptor(\n name: PropertyKey, key: string|symbol, options: PropertyDeclaration) {\n return {\n // tslint:disable-next-line:no-any no symbol in index\n get(): any {\n return (this as {[key: string]: unknown})[key as string];\n },\n set(this: UpdatingElement, value: unknown) {\n const oldValue =\n (this as {} as {[key: string]: unknown})[name as string];\n (this as {} as {[key: string]: unknown})[key as string] = value;\n (this as unknown as UpdatingElement)\n .requestUpdateInternal(name, oldValue, options);\n },\n configurable: true,\n enumerable: true\n };\n }\n\n /**\n * Returns the property options associated with the given property.\n * These options are defined with a PropertyDeclaration via the `properties`\n * object or the `@property` decorator and are registered in\n * `createProperty(...)`.\n *\n * Note, this method should be considered \"final\" and not overridden. To\n * customize the options for a given property, override `createProperty`.\n *\n * @nocollapse\n * @final\n */\n protected static getPropertyOptions(name: PropertyKey) {\n return this._classProperties && this._classProperties.get(name) ||\n defaultPropertyDeclaration;\n }\n\n /**\n * Creates property accessors for registered properties and ensures\n * any superclasses are also finalized.\n * @nocollapse\n */\n protected static finalize() {\n // finalize any superclasses\n const superCtor = Object.getPrototypeOf(this);\n if (!superCtor.hasOwnProperty(finalized)) {\n superCtor.finalize();\n }\n this[finalized] = true;\n this._ensureClassProperties();\n // initialize Map populated in observedAttributes\n this._attributeToPropertyMap = new Map();\n // make any properties\n // Note, only process \"own\" properties since this element will inherit\n // any properties defined on the superClass, and finalization ensures\n // the entire prototype chain is finalized.\n if (this.hasOwnProperty(JSCompiler_renameProperty('properties', this))) {\n const props = this.properties;\n // support symbols in properties (IE11 does not support this)\n const propKeys = [\n ...Object.getOwnPropertyNames(props),\n ...(typeof Object.getOwnPropertySymbols === 'function') ?\n Object.getOwnPropertySymbols(props) :\n []\n ];\n // This for/of is ok because propKeys is an array\n for (const p of propKeys) {\n // note, use of `any` is due to TypeSript lack of support for symbol in\n // index types\n // tslint:disable-next-line:no-any no symbol in index\n this.createProperty(p, (props as any)[p]);\n }\n }\n }\n\n /**\n * Returns the property name for the given attribute `name`.\n * @nocollapse\n */\n private static _attributeNameForProperty(\n name: PropertyKey, options: PropertyDeclaration) {\n const attribute = options.attribute;\n return attribute === false ?\n undefined :\n (typeof attribute === 'string' ?\n attribute :\n (typeof name === 'string' ? name.toLowerCase() : undefined));\n }\n\n /**\n * Returns true if a property should request an update.\n * Called when a property value is set and uses the `hasChanged`\n * option for the property if present or a strict identity check.\n * @nocollapse\n */\n private static _valueHasChanged(\n value: unknown, old: unknown, hasChanged: HasChanged = notEqual) {\n return hasChanged(value, old);\n }\n\n /**\n * Returns the property value for the given attribute value.\n * Called via the `attributeChangedCallback` and uses the property's\n * `converter` or `converter.fromAttribute` property option.\n * @nocollapse\n */\n private static _propertyValueFromAttribute(\n value: string|null, options: PropertyDeclaration) {\n const type = options.type;\n const converter = options.converter || defaultConverter;\n const fromAttribute =\n (typeof converter === 'function' ? converter : converter.fromAttribute);\n return fromAttribute ? fromAttribute(value, type) : value;\n }\n\n /**\n * Returns the attribute value for the given property value. If this\n * returns undefined, the property will *not* be reflected to an attribute.\n * If this returns null, the attribute will be removed, otherwise the\n * attribute will be set to the value.\n * This uses the property's `reflect` and `type.toAttribute` property options.\n * @nocollapse\n */\n private static _propertyValueToAttribute(\n value: unknown, options: PropertyDeclaration) {\n if (options.reflect === undefined) {\n return;\n }\n const type = options.type;\n const converter = options.converter;\n const toAttribute =\n converter && (converter as ComplexAttributeConverter).toAttribute ||\n defaultConverter.toAttribute;\n return toAttribute!(value, type);\n }\n\n private _updateState!: UpdateState;\n private _instanceProperties?: PropertyValues;\n // Initialize to an unresolved Promise so we can make sure the element has\n // connected before first update.\n private _updatePromise!: Promise<unknown>;\n private _enableUpdatingResolver: ((r?: unknown) => void)|undefined;\n\n /**\n * Map with keys for any properties that have changed since the last\n * update cycle with previous values.\n */\n private _changedProperties!: PropertyValues;\n\n /**\n * Map with keys of properties that should be reflected when updated.\n */\n private _reflectingProperties?: Map<PropertyKey, PropertyDeclaration>;\n\n constructor() {\n super();\n this.initialize();\n }\n\n /**\n * Performs element initialization. By default captures any pre-set values for\n * registered properties.\n */\n protected initialize() {\n this._updateState = 0;\n this._updatePromise =\n new Promise((res) => this._enableUpdatingResolver = res);\n this._changedProperties = new Map();\n this._saveInstanceProperties();\n // ensures first update will be caught by an early access of\n // `updateComplete`\n this.requestUpdateInternal();\n }\n\n /**\n * Fixes any properties set on the instance before upgrade time.\n * Otherwise these would shadow the accessor and break these properties.\n * The properties are stored in a Map which is played back after the\n * constructor runs. Note, on very old versions of Safari (<=9) or Chrome\n * (<=41), properties created for native platform properties like (`id` or\n * `name`) may not have default values set in the element constructor. On\n * these browsers native properties appear on instances and therefore their\n * default value will overwrite any element default (e.g. if the element sets\n * this.id = 'id' in the constructor, the 'id' will become '' since this is\n * the native platform default).\n */\n private _saveInstanceProperties() {\n // Use forEach so this works even if for/of loops are compiled to for loops\n // expecting arrays\n (this.constructor as typeof UpdatingElement)\n ._classProperties!.forEach((_v, p) => {\n if (this.hasOwnProperty(p)) {\n const value = this[p as keyof this];\n delete this[p as keyof this];\n if (!this._instanceProperties) {\n this._instanceProperties = new Map();\n }\n this._instanceProperties.set(p, value);\n }\n });\n }\n\n /**\n * Applies previously saved instance properties.\n */\n private _applyInstanceProperties() {\n // Use forEach so this works even if for/of loops are compiled to for loops\n // expecting arrays\n // tslint:disable-next-line:no-any\n this._instanceProperties!.forEach((v, p) => (this as any)[p] = v);\n this._instanceProperties = undefined;\n }\n\n connectedCallback() {\n // Ensure first connection completes an update. Updates cannot complete\n // before connection.\n this.enableUpdating();\n }\n\n protected enableUpdating() {\n if (this._enableUpdatingResolver !== undefined) {\n this._enableUpdatingResolver();\n this._enableUpdatingResolver = undefined;\n }\n }\n\n /**\n * Allows for `super.disconnectedCallback()` in extensions while\n * reserving the possibility of making non-breaking feature additions\n * when disconnecting at some point in the future.\n */\n disconnectedCallback() {\n }\n\n /**\n * Synchronizes property values when attributes change.\n */\n attributeChangedCallback(name: string, old: string|null, value: string|null) {\n if (old !== value) {\n this._attributeToProperty(name, value);\n }\n }\n\n private _propertyToAttribute(\n name: PropertyKey, value: unknown,\n options: PropertyDeclaration = defaultPropertyDeclaration) {\n const ctor = (this.constructor as typeof UpdatingElement);\n const attr = ctor._attributeNameForProperty(name, options);\n if (attr !== undefined) {\n const attrValue = ctor._propertyValueToAttribute(value, options);\n // an undefined value does not change the attribute.\n if (attrValue === undefined) {\n return;\n }\n // Track if the property is being reflected to avoid\n // setting the property again via `attributeChangedCallback`. Note:\n // 1. this takes advantage of the fact that the callback is synchronous.\n // 2. will behave incorrectly if multiple attributes are in the reaction\n // stack at time of calling. However, since we process attributes\n // in `update` this should not be possible (or an extreme corner case\n // that we'd like to discover).\n // mark state reflecting\n this._updateState = this._updateState | STATE_IS_REFLECTING_TO_ATTRIBUTE;\n if (attrValue == null) {\n this.removeAttribute(attr);\n } else {\n this.setAttribute(attr, attrValue as string);\n }\n // mark state not reflecting\n this._updateState = this._updateState & ~STATE_IS_REFLECTING_TO_ATTRIBUTE;\n }\n }\n\n private _attributeToProperty(name: string, value: string|null) {\n // Use tracking info to avoid deserializing attribute value if it was\n // just set from a property setter.\n if (this._updateState & STATE_IS_REFLECTING_TO_ATTRIBUTE) {\n return;\n }\n const ctor = (this.constructor as typeof UpdatingElement);\n // Note, hint this as an `AttributeMap` so closure clearly understands\n // the type; it has issues with tracking types through statics\n // tslint:disable-next-line:no-unnecessary-type-assertion\n const propName = (ctor._attributeToPropertyMap as AttributeMap).get(name);\n if (propName !== undefined) {\n const options = ctor.getPropertyOptions(propName);\n // mark state reflecting\n this._updateState = this._updateState | STATE_IS_REFLECTING_TO_PROPERTY;\n this[propName as keyof this] =\n // tslint:disable-next-line:no-any\n ctor._propertyValueFromAttribute(value, options) as any;\n // mark state not reflecting\n this._updateState = this._updateState & ~STATE_IS_REFLECTING_TO_PROPERTY;\n }\n }\n\n /**\n * This protected version of `requestUpdate` does not access or return the\n * `updateComplete` promise. This promise can be overridden and is therefore\n * not free to access.\n */\n protected requestUpdateInternal(\n name?: PropertyKey, oldValue?: unknown, options?: PropertyDeclaration) {\n let shouldRequestUpdate = true;\n // If we have a property key, perform property update steps.\n if (name !== undefined) {\n const ctor = this.constructor as typeof UpdatingElement;\n options = options || ctor.getPropertyOptions(name);\n if (ctor._valueHasChanged(\n this[name as keyof this], oldValue, options.hasChanged)) {\n if (!this._changedProperties.has(name)) {\n this._changedProperties.set(name, oldValue);\n }\n // Add to reflecting properties set.\n // Note, it's important that every change has a chance to add the\n // property to `_reflectingProperties`. This ensures setting\n // attribute + property reflects correctly.\n if (options.reflect === true &&\n !(this._updateState & STATE_IS_REFLECTING_TO_PROPERTY)) {\n if (this._reflectingProperties === undefined) {\n this._reflectingProperties = new Map();\n }\n this._reflectingProperties.set(name, options);\n }\n } else {\n // Abort the request if the property should not be considered changed.\n shouldRequestUpdate = false;\n }\n }\n if (!this._hasRequestedUpdate && shouldRequestUpdate) {\n this._updatePromise = this._enqueueUpdate();\n }\n }\n\n /**\n * Requests an update which is processed asynchronously. This should\n * be called when an element should update based on some state not triggered\n * by setting a property. In this case, pass no arguments. It should also be\n * called when manually implementing a property setter. In this case, pass the\n * property `name` and `oldValue` to ensure that any configured property\n * options are honored. Returns the `updateComplete` Promise which is resolved\n * when the update completes.\n *\n * @param name {PropertyKey} (optional) name of requesting property\n * @param oldValue {any} (optional) old value of requesting property\n * @returns {Promise} A Promise that is resolved when the update completes.\n */\n requestUpdate(name?: PropertyKey, oldValue?: unknown) {\n this.requestUpdateInternal(name, oldValue);\n return this.updateComplete;\n }\n\n /**\n * Sets up the element to asynchronously update.\n */\n private async _enqueueUpdate() {\n this._updateState = this._updateState | STATE_UPDATE_REQUESTED;\n try {\n // Ensure any previous update has resolved before updating.\n // This `await` also ensures that property changes are batched.\n await this._updatePromise;\n } catch (e) {\n // Ignore any previous errors. We only care that the previous cycle is\n // done. Any error should have been handled in the previous update.\n }\n const result = this.performUpdate();\n // If `performUpdate` returns a Promise, we await it. This is done to\n // enable coordinating updates with a scheduler. Note, the result is\n // checked to avoid delaying an additional microtask unless we need to.\n if (result != null) {\n await result;\n }\n return !this._hasRequestedUpdate;\n }\n\n private get _hasRequestedUpdate() {\n return (this._updateState & STATE_UPDATE_REQUESTED);\n }\n\n protected get hasUpdated() {\n return (this._updateState & STATE_HAS_UPDATED);\n }\n\n /**\n * Performs an element update. Note, if an exception is thrown during the\n * update, `firstUpdated` and `updated` will not be called.\n *\n * You can override this method to change the timing of updates. If this\n * method is overridden, `super.performUpdate()` must be called.\n *\n * For instance, to schedule updates to occur just before the next frame:\n *\n * ```\n * protected async performUpdate(): Promise<unknown> {\n * await new Promise((resolve) => requestAnimationFrame(() => resolve()));\n * super.performUpdate();\n * }\n * ```\n */\n protected performUpdate(): void|Promise<unknown> {\n // Abort any update if one is not pending when this is called.\n // This can happen if `performUpdate` is called early to \"flush\"\n // the update.\n if (!this._hasRequestedUpdate) {\n return;\n }\n // Mixin instance properties once, if they exist.\n if (this._instanceProperties) {\n this._applyInstanceProperties();\n }\n let shouldUpdate = false;\n const changedProperties = this._changedProperties;\n try {\n shouldUpdate = this.shouldUpdate(changedProperties);\n if (shouldUpdate) {\n this.update(changedProperties);\n } else {\n this._markUpdated();\n }\n } catch (e) {\n // Prevent `firstUpdated` and `updated` from running when there's an\n // update exception.\n shouldUpdate = false;\n // Ensure element can accept additional updates after an exception.\n this._markUpdated();\n throw e;\n }\n if (shouldUpdate) {\n if (!(this._updateState & STATE_HAS_UPDATED)) {\n this._updateState = this._updateState | STATE_HAS_UPDATED;\n this.firstUpdated(changedProperties);\n }\n this.updated(changedProperties);\n }\n }\n\n private _markUpdated() {\n this._changedProperties = new Map();\n this._updateState = this._updateState & ~STATE_UPDATE_REQUESTED;\n }\n\n /**\n * Returns a Promise that resolves when the element has completed updating.\n * The Promise value is a boolean that is `true` if the element completed the\n * update without triggering another update. The Promise result is `false` if\n * a property was set inside `updated()`. If the Promise is rejected, an\n * exception was thrown during the update.\n *\n * To await additional asynchronous work, override the `_getUpdateComplete`\n * method. For example, it is sometimes useful to await a rendered element\n * before fulfilling this Promise. To do this, first await\n * `super._getUpdateComplete()`, then any subsequent state.\n *\n * @returns {Promise} The Promise returns a boolean that indicates if the\n * update resolved without triggering another update.\n */\n get updateComplete() {\n return this._getUpdateComplete();\n }\n\n /**\n * Override point for the `updateComplete` promise.\n *\n * It is not safe to override the `updateComplete` getter directly due to a\n * limitation in TypeScript which means it is not possible to call a\n * superclass getter (e.g. `super.updateComplete.then(...)`) when the target\n * language is ES5 (https://github.com/microsoft/TypeScript/issues/338).\n * This method should be overridden instead. For example:\n *\n * class MyElement extends LitElement {\n * async _getUpdateComplete() {\n * await super._getUpdateComplete();\n * await this._myChild.updateComplete;\n * }\n * }\n * @deprecated Override `getUpdateComplete()` instead for forward\n * compatibility with `lit-element` 3.0 / `@lit/reactive-element`.\n */\n protected _getUpdateComplete() {\n return this.getUpdateComplete();\n }\n\n /**\n * Override point for the `updateComplete` promise.\n *\n * It is not safe to override the `updateComplete` getter directly due to a\n * limitation in TypeScript which means it is not possible to call a\n * superclass getter (e.g. `super.updateComplete.then(...)`) when the target\n * language is ES5 (https://github.com/microsoft/TypeScript/issues/338).\n * This method should be overridden instead. For example:\n *\n * class MyElement extends LitElement {\n * async getUpdateComplete() {\n * await super.getUpdateComplete();\n * await this._myChild.updateComplete;\n * }\n * }\n */\n protected getUpdateComplete() {\n return this._updatePromise;\n }\n\n /**\n * Controls whether or not `update` should be called when the element requests\n * an update. By default, this method always returns `true`, but this can be\n * customized to control when to update.\n *\n * @param _changedProperties Map of changed properties with old values\n */\n protected shouldUpdate(_changedProperties: PropertyValues): boolean {\n return true;\n }\n\n /**\n * Updates the element. This method reflects property values to attributes.\n * It can be overridden to render and keep updated element DOM.\n * Setting properties inside this method will *not* trigger\n * another update.\n *\n * @param _changedProperties Map of changed properties with old values\n */\n protected update(_changedProperties: PropertyValues) {\n if (this._reflectingProperties !== undefined &&\n this._reflectingProperties.size > 0) {\n // Use forEach so this works even if for/of loops are compiled to for\n // loops expecting arrays\n this._reflectingProperties.forEach(\n (v, k) => this._propertyToAttribute(k, this[k as keyof this], v));\n this._reflectingProperties = undefined;\n }\n this._markUpdated();\n }\n\n /**\n * Invoked whenever the element is updated. Implement to perform\n * post-updating tasks via DOM APIs, for example, focusing an element.\n *\n * Setting properties inside this method will trigger the element to update\n * again after this update cycle completes.\n *\n * @param _changedProperties Map of changed properties with old values\n */\n protected updated(_changedProperties: PropertyValues) {\n }\n\n /**\n * Invoked when the element is first updated. Implement to perform one time\n * work on the element after update.\n *\n * Setting properties inside this method will trigger the element to update\n * again after this update cycle completes.\n *\n * @param _changedProperties Map of changed properties with old values\n */\n protected firstUpdated(_changedProperties: PropertyValues) {\n }\n}\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/*\n * IMPORTANT: For compatibility with tsickle and the Closure Compiler, all\n * property decorators (but not class decorators) in this file that have\n * an @ExportDecoratedItems annotation must be defined as a regular function,\n * not an arrow function.\n */\n\nimport {LitElement} from '../lit-element.js';\n\nimport {PropertyDeclaration, UpdatingElement} from './updating-element.js';\n\nexport type Constructor<T> = {\n // tslint:disable-next-line:no-any\n new (...args: any[]): T\n};\n\n// From the TC39 Decorators proposal\ninterface ClassDescriptor {\n kind: 'class';\n elements: ClassElement[];\n finisher?: <T>(clazz: Constructor<T>) => undefined | Constructor<T>;\n}\n\n// From the TC39 Decorators proposal\ninterface ClassElement {\n kind: 'field'|'method';\n key: PropertyKey;\n placement: 'static'|'prototype'|'own';\n initializer?: Function;\n extras?: ClassElement[];\n finisher?: <T>(clazz: Constructor<T>) => undefined | Constructor<T>;\n descriptor?: PropertyDescriptor;\n}\n\nconst legacyCustomElement =\n (tagName: string, clazz: Constructor<HTMLElement>) => {\n window.customElements.define(tagName, clazz);\n // Cast as any because TS doesn't recognize the return type as being a\n // subtype of the decorated class when clazz is typed as\n // `Constructor<HTMLElement>` for some reason.\n // `Constructor<HTMLElement>` is helpful to make sure the decorator is\n // applied to elements however.\n // tslint:disable-next-line:no-any\n return clazz as any;\n };\n\nconst standardCustomElement =\n (tagName: string, descriptor: ClassDescriptor) => {\n const {kind, elements} = descriptor;\n return {\n kind,\n elements,\n // This callback is called once the class is otherwise fully defined\n finisher(clazz: Constructor<HTMLElement>) {\n window.customElements.define(tagName, clazz);\n }\n };\n };\n\n/**\n * Class decorator factory that defines the decorated class as a custom element.\n *\n * ```\n * @customElement('my-element')\n * class MyElement {\n * render() {\n * return html``;\n * }\n * }\n * ```\n * @category Decorator\n * @param tagName The name of the custom element to define.\n */\nexport const customElement = (tagName: string) =>\n (classOrDescriptor: Constructor<HTMLElement>|ClassDescriptor) =>\n (typeof classOrDescriptor === 'function') ?\n legacyCustomElement(tagName, classOrDescriptor) :\n standardCustomElement(tagName, classOrDescriptor);\n\nconst standardProperty =\n (options: PropertyDeclaration, element: ClassElement) => {\n // When decorating an accessor, pass it through and add property metadata.\n // Note, the `hasOwnProperty` check in `createProperty` ensures we don't\n // stomp over the user's accessor.\n if (element.kind === 'method' && element.descriptor &&\n !('value' in element.descriptor)) {\n return {\n ...element,\n finisher(clazz: typeof UpdatingElement) {\n clazz.createProperty(element.key, options);\n }\n };\n } else {\n // createProperty() takes care of defining the property, but we still\n // must return some kind of descriptor, so return a descriptor for an\n // unused prototype field. The finisher calls createProperty().\n return {\n kind: 'field',\n key: Symbol(),\n placement: 'own',\n descriptor: {},\n // When @babel/plugin-proposal-decorators implements initializers,\n // do this instead of the initializer below. See:\n // https://github.com/babel/babel/issues/9260 extras: [\n // {\n // kind: 'initializer',\n // placement: 'own',\n // initializer: descriptor.initializer,\n // }\n // ],\n initializer(this: {[key: string]: unknown}) {\n if (typeof element.initializer === 'function') {\n this[element.key as string] = element.initializer.call(this);\n }\n },\n finisher(clazz: typeof UpdatingElement) {\n clazz.createProperty(element.key, options);\n }\n };\n }\n };\n\nconst legacyProperty =\n (options: PropertyDeclaration, proto: Object, name: PropertyKey) => {\n (proto.constructor as typeof UpdatingElement)\n .createProperty(name, options);\n };\n\n/**\n * A property decorator which creates a LitElement property which reflects a\n * corresponding attribute value. A [[`PropertyDeclaration`]] may optionally be\n * supplied to configure property features.\n *\n * This decorator should only be used for public fields. Private or protected\n * fields should use the [[`internalProperty`]] decorator.\n *\n * @example\n * ```ts\n * class MyElement {\n * @property({ type: Boolean })\n * clicked = false;\n * }\n * ```\n * @category Decorator\n * @ExportDecoratedItems\n */\nexport function property(options?: PropertyDeclaration) {\n // tslint:disable-next-line:no-any decorator\n return (protoOrDescriptor: Object|ClassElement, name?: PropertyKey): any =>\n (name !== undefined) ?\n legacyProperty(options!, protoOrDescriptor as Object, name) :\n standardProperty(options!, protoOrDescriptor as ClassElement);\n}\n\nexport interface InternalPropertyDeclaration<Type = unknown> {\n /**\n * A function that indicates if a property should be considered changed when\n * it is set. The function should take the `newValue` and `oldValue` and\n * return `true` if an update should be requested.\n */\n hasChanged?(value: Type, oldValue: Type): boolean;\n}\n\n/**\n * Declares a private or protected property that still triggers updates to the\n * element when it changes.\n *\n * Properties declared this way must not be used from HTML or HTML templating\n * systems, they're solely for properties internal to the element. These\n * properties may be renamed by optimization tools like the Closure Compiler.\n * @category Decorator\n * @deprecated `internalProperty` has been renamed to `state` in lit-element\n * 3.0. Please update to `state` now to be compatible with 3.0.\n */\nexport function internalProperty(options?: InternalPropertyDeclaration) {\n return property({attribute: false, hasChanged: options?.hasChanged});\n}\n\n/**\n * Declares a private or protected property that still triggers updates to the\n * element when it changes.\n *\n * Properties declared this way must not be used from HTML or HTML templating\n * systems, they're solely for properties internal to the element. These\n * properties may be renamed by optimization tools like the Closure Compiler.\n * @category Decorator\n */\nexport const state = (options?: InternalPropertyDeclaration) =>\n internalProperty(options);\n\n/**\n * A property decorator that converts a class property into a getter that\n * executes a querySelector on the element's renderRoot.\n *\n * @param selector A DOMString containing one or more selectors to match.\n * @param cache An optional boolean which when true performs the DOM query only\n * once and caches the result.\n *\n * See: https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector\n *\n * @example\n *\n * ```ts\n * class MyElement {\n * @query('#first')\n * first;\n *\n * render() {\n * return html`\n * <div id=\"first\"></div>\n * <div id=\"second\"></div>\n * `;\n * }\n * }\n * ```\n * @category Decorator\n */\nexport function query(selector: string, cache?: boolean) {\n return (protoOrDescriptor: Object|ClassElement,\n // tslint:disable-next-line:no-any decorator\n name?: PropertyKey): any => {\n const descriptor = {\n get(this: LitElement) {\n return this.renderRoot.querySelector(selector);\n },\n enumerable: true,\n configurable: true,\n };\n if (cache) {\n const prop =\n name !== undefined ? name : (protoOrDescriptor as ClassElement).key;\n const key = typeof prop === 'symbol' ? Symbol() : `__${prop}`;\n descriptor.get = function(this: LitElement) {\n if ((this as unknown as\n {[key: string]: Element | null})[key as string] === undefined) {\n ((this as unknown as {[key: string]: Element | null})[key as string] =\n this.renderRoot.querySelector(selector));\n }\n return (\n this as unknown as {[key: string]: Element | null})[key as string];\n };\n }\n return (name !== undefined) ?\n legacyQuery(descriptor, protoOrDescriptor as Object, name) :\n standardQuery(descriptor, protoOrDescriptor as ClassElement);\n };\n}\n\n// Note, in the future, we may extend this decorator to support the use case\n// where the queried element may need to do work to become ready to interact\n// with (e.g. load some implementation code). If so, we might elect to\n// add a second argument defining a function that can be run to make the\n// queried element loaded/updated/ready.\n/**\n * A property decorator that converts a class property into a getter that\n * returns a promise that resolves to the result of a querySelector on the\n * element's renderRoot done after the element's `updateComplete` promise\n * resolves. When the queried property may change with element state, this\n * decorator can be used instead of requiring users to await the\n * `updateComplete` before accessing the property.\n *\n * @param selector A DOMString containing one or more selectors to match.\n *\n * See: https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector\n *\n * @example\n * ```ts\n * class MyElement {\n * @queryAsync('#first')\n * first;\n *\n * render() {\n * return html`\n * <div id=\"first\"></div>\n * <div id=\"second\"></div>\n * `;\n * }\n * }\n *\n * // external usage\n * async doSomethingWithFirst() {\n * (await aMyElement.first).doSomething();\n * }\n * ```\n * @category Decorator\n */\nexport function queryAsync(selector: string) {\n return (protoOrDescriptor: Object|ClassElement,\n // tslint:disable-next-line:no-any decorator\n name?: PropertyKey): any => {\n const descriptor = {\n async get(this: LitElement) {\n await this.updateComplete;\n return this.renderRoot.querySelector(selector);\n },\n enumerable: true,\n configurable: true,\n };\n return (name !== undefined) ?\n legacyQuery(descriptor, protoOrDescriptor as Object, name) :\n standardQuery(descriptor, protoOrDescriptor as ClassElement);\n };\n}\n\n/**\n * A property decorator that converts a class property into a getter\n * that executes a querySelectorAll on the element's renderRoot.\n *\n * @param selector A DOMString containing one or more selectors to match.\n *\n * See:\n * https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll\n *\n * @example\n * ```ts\n * class MyElement {\n * @queryAll('div')\n * divs;\n *\n * render() {\n * return html`\n * <div id=\"first\"></div>\n * <div id=\"second\"></div>\n * `;\n * }\n * }\n * ```\n * @category Decorator\n */\nexport function queryAll(selector: string) {\n return (protoOrDescriptor: Object|ClassElement,\n // tslint:disable-next-line:no-any decorator\n name?: PropertyKey): any => {\n const descriptor = {\n get(this: LitElement) {\n return this.renderRoot.querySelectorAll(selector);\n },\n enumerable: true,\n configurable: true,\n };\n return (name !== undefined) ?\n legacyQuery(descriptor, protoOrDescriptor as Object, name) :\n standardQuery(descriptor, protoOrDescriptor as ClassElement);\n };\n}\n\nconst legacyQuery =\n (descriptor: PropertyDescriptor, proto: Object, name: PropertyKey) => {\n Object.defineProperty(proto, name, descriptor);\n };\n\nconst standardQuery = (descriptor: PropertyDescriptor, element: ClassElement) =>\n ({\n kind: 'method',\n placement: 'prototype',\n key: element.key,\n descriptor,\n });\n\nconst standardEventOptions =\n (options: AddEventListenerOptions, element: ClassElement) => {\n return {\n ...element,\n finisher(clazz: typeof UpdatingElement) {\n Object.assign(\n clazz.prototype[element.key as keyof UpdatingElement], options);\n }\n };\n };\n\nconst legacyEventOptions =\n // tslint:disable-next-line:no-any legacy decorator\n (options: AddEventListenerOptions, proto: any, name: PropertyKey) => {\n Object.assign(proto[name], options);\n };\n\n/**\n * Adds event listener options to a method used as an event listener in a\n * lit-html template.\n *\n * @param options An object that specifies event listener options as accepted by\n * `EventTarget#addEventListener` and `EventTarget#removeEventListener`.\n *\n * Current browsers support the `capture`, `passive`, and `once` options. See:\n * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Parameters\n *\n * @example\n * ```ts\n * class MyElement {\n * clicked = false;\n *\n * render() {\n * return html`\n * <div @click=${this._onClick}`>\n * <button></button>\n * </div>\n * `;\n * }\n *\n * @eventOptions({capture: true})\n * _onClick(e) {\n * this.clicked = true;\n * }\n * }\n * ```\n * @category Decorator\n */\nexport function eventOptions(options: AddEventListenerOptions) {\n // Return value typed as any to prevent TypeScript from complaining that\n // standard decorator function signature does not match TypeScript decorator\n // signature\n // TODO(kschaaf): unclear why it was only failing on this decorator and not\n // the others\n return ((protoOrDescriptor: Object|ClassElement, name?: string) =>\n (name !== undefined) ?\n legacyEventOptions(options, protoOrDescriptor as Object, name) :\n standardEventOptions(\n options, protoOrDescriptor as ClassElement)) as\n // tslint:disable-next-line:no-any decorator\n any;\n}\n\n// x-browser support for matches\n// tslint:disable-next-line:no-any\nconst ElementProto = Element.prototype as any;\nconst legacyMatches =\n ElementProto.msMatchesSelector || ElementProto.webkitMatchesSelector;\n\n/**\n * A property decorator that converts a class property into a getter that\n * returns the `assignedNodes` of the given named `slot`. Note, the type of\n * this property should be annotated as `NodeListOf<HTMLElement>`.\n *\n * @param slotName A string name of the slot.\n * @param flatten A boolean which when true flattens the assigned nodes,\n * meaning any assigned nodes that are slot elements are replaced with their\n * assigned nodes.\n * @param selector A string which filters the results to elements that match\n * the given css selector.\n *\n * * @example\n * ```ts\n * class MyElement {\n * @queryAssignedNodes('list', true, '.item')\n * listItems;\n *\n * render() {\n * return html`\n * <slot name=\"list\"></slot>\n * `;\n * }\n * }\n * ```\n * @category Decorator\n */\nexport function queryAssignedNodes(\n slotName = '', flatten = false, selector = '') {\n return (protoOrDescriptor: Object|ClassElement,\n // tslint:disable-next-line:no-any decorator\n name?: PropertyKey): any => {\n const descriptor = {\n get(this: LitElement) {\n const slotSelector =\n `slot${slotName ? `[name=${slotName}]` : ':not([name])'}`;\n const slot = this.renderRoot.querySelector(slotSelector);\n let nodes = slot && (slot as HTMLSlotElement).assignedNodes({flatten});\n if (nodes && selector) {\n nodes = nodes.filter(\n (node) => node.nodeType === Node.ELEMENT_NODE &&\n // tslint:disable-next-line:no-any testing existence on older browsers\n ((node as any).matches ?\n (node as Element).matches(selector) :\n legacyMatches.call(node as Element, selector)));\n }\n return nodes;\n },\n enumerable: true,\n configurable: true,\n };\n return (name !== undefined) ?\n legacyQuery(descriptor, protoOrDescriptor as Object, name) :\n standardQuery(descriptor, protoOrDescriptor as ClassElement);\n };\n}\n", "/**\n@license\nCopyright (c) 2019 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at\nhttp://polymer.github.io/LICENSE.txt The complete set of authors may be found at\nhttp://polymer.github.io/AUTHORS.txt The complete set of contributors may be\nfound at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by Google as\npart of the polymer project is also subject to an additional IP rights grant\nfound at http://polymer.github.io/PATENTS.txt\n*/\n\n/**\n * Whether the current browser supports `adoptedStyleSheets`.\n */\nexport const supportsAdoptingStyleSheets = (window.ShadowRoot) &&\n (window.ShadyCSS === undefined || window.ShadyCSS.nativeShadow) &&\n ('adoptedStyleSheets' in Document.prototype) &&\n ('replace' in CSSStyleSheet.prototype);\n\nconst constructionToken = Symbol();\n\nexport class CSSResult {\n _styleSheet?: CSSStyleSheet|null;\n\n readonly cssText: string;\n\n constructor(cssText: string, safeToken: symbol) {\n if (safeToken !== constructionToken) {\n throw new Error(\n 'CSSResult is not constructable. Use `unsafeCSS` or `css` instead.');\n }\n\n this.cssText = cssText;\n }\n\n // Note, this is a getter so that it's lazy. In practice, this means\n // stylesheets are not created until the first element instance is made.\n get styleSheet(): CSSStyleSheet|null {\n if (this._styleSheet === undefined) {\n // Note, if `supportsAdoptingStyleSheets` is true then we assume\n // CSSStyleSheet is constructable.\n if (supportsAdoptingStyleSheets) {\n this._styleSheet = new CSSStyleSheet();\n this._styleSheet.replaceSync(this.cssText);\n } else {\n this._styleSheet = null;\n }\n }\n return this._styleSheet;\n }\n\n toString(): string {\n return this.cssText;\n }\n}\n\n/**\n * Wrap a value for interpolation in a [[`css`]] tagged template literal.\n *\n * This is unsafe because untrusted CSS text can be used to phone home\n * or exfiltrate data to an attacker controlled site. Take care to only use\n * this with trusted input.\n */\nexport const unsafeCSS = (value: unknown) => {\n return new CSSResult(String(value), constructionToken);\n};\n\nconst textFromCSSResult = (value: CSSResult|number) => {\n if (value instanceof CSSResult) {\n return value.cssText;\n } else if (typeof value === 'number') {\n return value;\n } else {\n throw new Error(\n `Value passed to 'css' function must be a 'css' function result: ${\n value}. Use 'unsafeCSS' to pass non-literal values, but\n take care to ensure page security.`);\n }\n};\n\n/**\n * Template tag which which can be used with LitElement's [[LitElement.styles |\n * `styles`]] property to set element styles. For security reasons, only literal\n * string values may be used. To incorporate non-literal values [[`unsafeCSS`]]\n * may be used inside a template string part.\n */\nexport const css =\n (strings: TemplateStringsArray, ...values: (CSSResult|number)[]) => {\n const cssText = values.reduce(\n (acc, v, idx) => acc + textFromCSSResult(v) + strings[idx + 1],\n strings[0]);\n return new CSSResult(cssText, constructionToken);\n };\n", "/**\n * @license\n * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\n/**\n * The main LitElement module, which defines the [[`LitElement`]] base class and\n * related APIs.\n *\n * LitElement components can define a template and a set of observed\n * properties. Changing an observed property triggers a re-render of the\n * element.\n *\n * Import [[`LitElement`]] and [[`html`]] from this module to create a\n * component:\n *\n * ```js\n * import {LitElement, html} from 'lit-element';\n *\n * class MyElement extends LitElement {\n *\n * // Declare observed properties\n * static get properties() {\n * return {\n * adjective: {}\n * }\n * }\n *\n * constructor() {\n * this.adjective = 'awesome';\n * }\n *\n * // Define the element's template\n * render() {\n * return html`<p>your ${adjective} template here</p>`;\n * }\n * }\n *\n * customElements.define('my-element', MyElement);\n * ```\n *\n * `LitElement` extends [[`UpdatingElement`]] and adds lit-html templating.\n * The `UpdatingElement` class is provided for users that want to build\n * their own custom element base classes that don't use lit-html.\n *\n * @packageDocumentation\n */\nimport {render, ShadyRenderOptions} from 'lit-html/lib/shady-render.js';\n\nimport {PropertyValues, UpdatingElement} from './lib/updating-element.js';\n\nexport * from './lib/updating-element.js';\nexport {UpdatingElement as ReactiveElement} from './lib/updating-element.js';\nexport * from './lib/decorators.js';\nexport {html, svg, TemplateResult, SVGTemplateResult} from 'lit-html/lit-html.js';\nimport {supportsAdoptingStyleSheets, CSSResult, unsafeCSS} from './lib/css-tag.js';\nexport * from './lib/css-tag.js';\n\ndeclare global {\n interface Window {\n litElementVersions: string[];\n }\n}\n\n// IMPORTANT: do not change the property name or the assignment expression.\n// This line will be used in regexes to search for LitElement usage.\n// TODO(justinfagnani): inject version number at build time\n(window['litElementVersions'] || (window['litElementVersions'] = []))\n .push('2.5.1');\n\nexport type CSSResultOrNative = CSSResult|CSSStyleSheet;\n\nexport interface CSSResultArray extends\n Array<CSSResultOrNative|CSSResultArray> {}\n\nexport type CSSResultGroup = CSSResultOrNative|CSSResultArray;\n\n/**\n * Sentinal value used to avoid calling lit-html's render function when\n * subclasses do not implement `render`\n */\nconst renderNotImplemented = {};\n\n/**\n * Base element class that manages element properties and attributes, and\n * renders a lit-html template.\n *\n * To define a component, subclass `LitElement` and implement a\n * `render` method to provide the component's template. Define properties\n * using the [[`properties`]] property or the [[`property`]] decorator.\n */\nexport class LitElement extends UpdatingElement {\n /**\n * Ensure this class is marked as `finalized` as an optimization ensuring\n * it will not needlessly try to `finalize`.\n *\n * Note this property name is a string to prevent breaking Closure JS Compiler\n * optimizations. See updating-element.ts for more information.\n */\n protected static['finalized'] = true;\n\n /**\n * Reference to the underlying library method used to render the element's\n * DOM. By default, points to the `render` method from lit-html's shady-render\n * module.\n *\n * **Most users will never need to touch this property.**\n *\n * This property should not be confused with the `render` instance method,\n * which should be overridden to define a template for the element.\n *\n * Advanced users creating a new base class based on LitElement can override\n * this property to point to a custom render method with a signature that\n * matches [shady-render's `render`\n * method](https://lit-html.polymer-project.org/api/modules/shady_render.html#render).\n *\n * @nocollapse\n */\n static render:\n (result: unknown, container: Element|DocumentFragment,\n options: ShadyRenderOptions) => void = render;\n\n /**\n * Array of styles to apply to the element. The styles should be defined\n * using the [[`css`]] tag function or via constructible stylesheets.\n */\n static styles?: CSSResultGroup;\n\n /** @nocollapse */\n static shadowRootOptions: ShadowRootInit = {mode: 'open'};\n\n private static _styles: Array<CSSResultOrNative|CSSResult>|undefined;\n\n /**\n * Return the array of styles to apply to the element.\n * Override this method to integrate into a style management system.\n *\n * @nocollapse\n */\n static getStyles(): CSSResultGroup|undefined {\n return this.styles;\n }\n\n /** @nocollapse */\n private static _getUniqueStyles() {\n // Only gather styles once per class\n if (this.hasOwnProperty(JSCompiler_renameProperty('_styles', this))) {\n return;\n }\n // Take care not to call `this.getStyles()` multiple times since this\n // generates new CSSResults each time.\n // TODO(sorvell): Since we do not cache CSSResults by input, any\n // shared styles will generate new stylesheet objects, which is wasteful.\n // This should be addressed when a browser ships constructable\n // stylesheets.\n const userStyles = this.getStyles();\n\n if (Array.isArray(userStyles)) {\n // De-duplicate styles preserving the _last_ instance in the set.\n // This is a performance optimization to avoid duplicated styles that can\n // occur especially when composing via subclassing.\n // The last item is kept to try to preserve the cascade order with the\n // assumption that it's most important that last added styles override\n // previous styles.\n const addStyles = (styles: CSSResultArray, set: Set<CSSResultOrNative>):\n Set<CSSResultOrNative> => styles.reduceRight(\n (set: Set<CSSResultOrNative>, s) =>\n // Note: On IE set.add() does not return the set\n Array.isArray(s) ? addStyles(s, set) : (set.add(s), set),\n set);\n // Array.from does not work on Set in IE, otherwise return\n // Array.from(addStyles(userStyles, new Set<CSSResult>())).reverse()\n const set = addStyles(userStyles, new Set<CSSResultOrNative>());\n const styles: CSSResultOrNative[] = [];\n set.forEach((v) => styles.unshift(v));\n this._styles = styles;\n } else {\n this._styles = userStyles === undefined ? [] : [userStyles];\n }\n\n // Ensure that there are no invalid CSSStyleSheet instances here. They are\n // invalid in two conditions.\n // (1) the sheet is non-constructible (`sheet` of a HTMLStyleElement), but\n // this is impossible to check except via .replaceSync or use\n // (2) the ShadyCSS polyfill is enabled (:. supportsAdoptingStyleSheets is\n // false)\n this._styles = this._styles.map((s) => {\n if (s instanceof CSSStyleSheet && !supportsAdoptingStyleSheets) {\n // Flatten the cssText from the passed constructible stylesheet (or\n // undetectable non-constructible stylesheet). The user might have\n // expected to update their stylesheets over time, but the alternative\n // is a crash.\n const cssText = Array.prototype.slice.call(s.cssRules)\n .reduce((css, rule) => css + rule.cssText, '');\n return unsafeCSS(cssText);\n }\n return s;\n });\n }\n\n private _needsShimAdoptedStyleSheets?: boolean;\n\n /**\n * Node or ShadowRoot into which element DOM should be rendered. Defaults\n * to an open shadowRoot.\n */\n readonly renderRoot!: Element|DocumentFragment;\n\n /**\n * Performs element initialization. By default this calls\n * [[`createRenderRoot`]] to create the element [[`renderRoot`]] node and\n * captures any pre-set values for registered properties.\n */\n protected initialize() {\n super.initialize();\n (this.constructor as typeof LitElement)._getUniqueStyles();\n (this as {\n renderRoot: Element|DocumentFragment;\n }).renderRoot = this.createRenderRoot();\n // Note, if renderRoot is not a shadowRoot, styles would/could apply to the\n // element's getRootNode(). While this could be done, we're choosing not to\n // support this now since it would require different logic around de-duping.\n if (window.ShadowRoot && this.renderRoot instanceof window.ShadowRoot) {\n this.adoptStyles();\n }\n }\n\n /**\n * Returns the node into which the element should render and by default\n * creates and returns an open shadowRoot. Implement to customize where the\n * element's DOM is rendered. For example, to render into the element's\n * childNodes, return `this`.\n * @returns {Element|DocumentFragment} Returns a node into which to render.\n */\n protected createRenderRoot(): Element|ShadowRoot {\n return this.attachShadow(\n (this.constructor as typeof LitElement).shadowRootOptions);\n }\n\n /**\n * Applies styling to the element shadowRoot using the [[`styles`]]\n * property. Styling will apply using `shadowRoot.adoptedStyleSheets` where\n * available and will fallback otherwise. When Shadow DOM is polyfilled,\n * ShadyCSS scopes styles and adds them to the document. When Shadow DOM\n * is available but `adoptedStyleSheets` is not, styles are appended to the\n * end of the `shadowRoot` to [mimic spec\n * behavior](https://wicg.github.io/construct-stylesheets/#using-constructed-stylesheets).\n */\n protected adoptStyles() {\n const styles = (this.constructor as typeof LitElement)._styles!;\n if (styles.length === 0) {\n return;\n }\n // There are three separate cases here based on Shadow DOM support.\n // (1) shadowRoot polyfilled: use ShadyCSS\n // (2) shadowRoot.adoptedStyleSheets available: use it\n // (3) shadowRoot.adoptedStyleSheets polyfilled: append styles after\n // rendering\n if (window.ShadyCSS !== undefined && !window.ShadyCSS.nativeShadow) {\n window.ShadyCSS.ScopingShim!.prepareAdoptedCssText(\n styles.map((s) => (s as CSSResult).cssText), this.localName);\n } else if (supportsAdoptingStyleSheets) {\n (this.renderRoot as ShadowRoot).adoptedStyleSheets =\n styles.map((s) => s instanceof CSSStyleSheet ? s : s.styleSheet!);\n } else {\n // This must be done after rendering so the actual style insertion is done\n // in `update`.\n this._needsShimAdoptedStyleSheets = true;\n }\n }\n\n connectedCallback() {\n super.connectedCallback();\n // Note, first update/render handles styleElement so we only call this if\n // connected after first update.\n if (this.hasUpdated && window.ShadyCSS !== undefined) {\n window.ShadyCSS.styleElement(this);\n }\n }\n\n /**\n * Updates the element. This method reflects property values to attributes\n * and calls `render` to render DOM via lit-html. Setting properties inside\n * this method will *not* trigger another update.\n * @param _changedProperties Map of changed properties with old values\n */\n protected update(changedProperties: PropertyValues) {\n // Setting properties in `render` should not trigger an update. Since\n // updates are allowed after super.update, it's important to call `render`\n // before that.\n const templateResult = this.render();\n super.update(changedProperties);\n // If render is not implemented by the component, don't call lit-html render\n if (templateResult !== renderNotImplemented) {\n (this.constructor as typeof LitElement)\n .render(\n templateResult,\n this.renderRoot,\n {scopeName: this.localName, eventContext: this});\n }\n // When native Shadow DOM is used but adoptedStyles are not supported,\n // insert styling after rendering to ensure adoptedStyles have highest\n // priority.\n if (this._needsShimAdoptedStyleSheets) {\n this._needsShimAdoptedStyleSheets = false;\n (this.constructor as typeof LitElement)._styles!.forEach((s) => {\n const style = document.createElement('style');\n style.textContent = (s as CSSResult).cssText;\n this.renderRoot.appendChild(style);\n });\n }\n }\n\n /**\n * Invoked on each update to perform rendering tasks. This method may return\n * any value renderable by lit-html's `NodePart` - typically a\n * `TemplateResult`. Setting properties inside this method will *not* trigger\n * the element to update.\n */\n protected render(): unknown {\n return renderNotImplemented;\n }\n}\n", "/**\n * @license\n * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at\n * http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at\n * http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at\n * http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at\n * http://polymer.github.io/PATENTS.txt\n */\n\nimport {AttributePart, directive, Part} from '../lit-html.js';\n\nconst previousValues = new WeakMap<Part, unknown>();\n\n/**\n * For AttributeParts, sets the attribute if the value is defined and removes\n * the attribute if the value is undefined.\n *\n * For other part types, this directive is a no-op.\n */\nexport const ifDefined = directive((value: unknown) => (part: Part) => {\n const previousValue = previousValues.get(part);\n\n if (value === undefined && part instanceof AttributePart) {\n // If the value is undefined, remove the attribute, but only if the value\n // was previously defined.\n if (previousValue !== undefined || !previousValues.has(part)) {\n const name = part.committer.name;\n part.committer.element.removeAttribute(name);\n }\n } else if (value !== previousValue) {\n part.setValue(value);\n }\n\n previousValues.set(part, value);\n});\n", "import { __decorate } from \"tslib\";\nimport { LitElement, css, customElement, html, property } from 'lit-element';\nimport { ifDefined } from 'lit-html/directives/if-defined';\n/**\n * Custom Element that Shows a CodeSandbox demo when you click on it.\n * @element\n * @example\n * ```html\n * <codesandbox-button sandbox-id=\"78bip\" hide-navigation module=\"/src/main-component.js\"></codesandbox-button>\n * ```\n */\nlet CodesandboxButton = class CodesandboxButton extends LitElement {\n constructor() {\n super(...arguments);\n /** font size */\n this.fontSize = 14;\n /** when true, hides navigation in the iframe */\n this.hideNavigation = false;\n /** when true, shows the CodeSandbox instead of the button */\n this.showDemo = false;\n this.theme = 'dark';\n }\n static get styles() {\n return css `\n :host { display: block; }\n\n button {\n background: none;\n border: none;\n transition: filter 0.2s ease-in-out;\n }\n\n button:hover,\n button:focus {\n filter:\n brightness(1.1)\n drop-shadow(2px 2px 2px grey);\n }\n `;\n }\n render() {\n return this.showDemo ? html `\n <iframe\n src=\"${ifDefined(this.getIframeSrc())}\"\n style=\"width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;\"\n allow=\"geolocation; microphone; camera; midi; vr; accelerometer; gyroscope; payment; ambient-light-sensor; encrypted-media; usb\"\n sandbox=\"allow-modals allow-forms allow-popups allow-scripts allow-same-origin\"\n ></iframe>\n ` : html `\n <button @click=\"${this.onClick}\">\n <slot name=\"button\">\n <img alt=\"Edit on CodeSandbox\" src=\"https://codesandbox.io/static/img/play-codesandbox.svg\" />\n </slot>\n </button>\n `;\n }\n getIframeSrc() {\n var _a;\n const { hideNavigation, module, theme, view } = this;\n const fontSize = this.fontSize.toString();\n const hidenavigation = (hideNavigation ? 1 : 0).toString();\n const params = new URLSearchParams(Object.entries(Object.assign({ fontSize,\n hidenavigation,\n module,\n theme }, view && { view })));\n if (!this.sandboxId)\n return;\n const id = (_a = this.sandboxId) === null || _a === void 0 ? void 0 : _a.split('-').pop();\n const url = new URL(`/embed/${id}`, 'https://codesandbox.io/');\n url.search = params.toString();\n return url.toString();\n }\n onClick() {\n this.showDemo = true;\n }\n};\n__decorate([\n property({ type: Number, attribute: 'font-size' })\n], CodesandboxButton.prototype, \"fontSize\", void 0);\n__decorate([\n property({ type: Boolean, attribute: 'hide-navigation' })\n], CodesandboxButton.prototype, \"hideNavigation\", void 0);\n__decorate([\n property({ type: String, attribute: 'sandbox-id' })\n], CodesandboxButton.prototype, \"sandboxId\", void 0);\n__decorate([\n property({ type: Boolean, attribute: 'show-demo', reflect: true })\n], CodesandboxButton.prototype, \"showDemo\", void 0);\n__decorate([\n property({ type: String })\n], CodesandboxButton.prototype, \"module\", void 0);\n__decorate([\n property({ type: String })\n], CodesandboxButton.prototype, \"theme\", void 0);\n__decorate([\n property({ type: String })\n], CodesandboxButton.prototype, \"view\", void 0);\nCodesandboxButton = __decorate([\n customElement('codesandbox-button')\n], CodesandboxButton);\nexport { CodesandboxButton };\n"],
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