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{"version":3,"file":"polyfill-support.js","sources":["../reactive-element/src/polyfill-support.ts","../lit-html/src/polyfill-support.ts","src/polyfill-support.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2017 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\n/**\n * ReactiveElement patch to support browsers without native web components.\n *\n * This module should be used in addition to loading the web components\n * polyfills via @webcomponents/webcomponentjs. When using those polyfills\n * support for polyfilled Shadow DOM is automatic via the ShadyDOM polyfill, but\n * support for Shadow DOM like css scoping is opt-in. This module uses ShadyCSS\n * to scope styles defined via the `static styles` property.\n *\n * @packageDocumentation\n */\n\nexport {};\n\ninterface RenderOptions {\n readonly renderBefore?: ChildNode | null;\n scope?: string;\n}\n\nconst SCOPED = '__scoped';\n\ntype CSSResults = Array<{cssText: string} | CSSStyleSheet>;\n\ninterface PatchableReactiveElementConstructor {\n [SCOPED]: boolean;\n elementStyles: CSSResults;\n shadowRootOptions: ShadowRootInit;\n _$handlesPrepareStyles?: boolean;\n}\n\ninterface PatchableReactiveElement extends HTMLElement {\n // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-misused-new\n new (...args: any[]): PatchableReactiveElement;\n constructor: PatchableReactiveElementConstructor;\n connectedCallback(): void;\n hasUpdated: boolean;\n _$didUpdate(changedProperties: unknown): void;\n createRenderRoot(): Element | ShadowRoot;\n renderOptions: RenderOptions;\n}\n\n// Note, explicitly use `var` here so that this can be re-defined when\n// bundled.\n// eslint-disable-next-line no-var\nvar DEV_MODE = true;\n\nconst polyfillSupport = ({\n ReactiveElement,\n}: {\n ReactiveElement: PatchableReactiveElement;\n}) => {\n // polyfill-support is only needed if ShadyCSS or the ApplyShim is in use\n // We test at the point of patching, which makes it safe to load\n // webcomponentsjs and polyfill-support in either order\n if (\n window.ShadyCSS === undefined ||\n (window.ShadyCSS.nativeShadow && !window.ShadyCSS.ApplyShim)\n ) {\n return;\n }\n\n // console.log(\n // '%c Making ReactiveElement compatible with ShadyDOM/CSS.',\n // 'color: lightgreen; font-style: italic'\n // );\n\n const elementProto = ReactiveElement.prototype;\n\n // In noPatch mode, patch the ReactiveElement prototype so that no\n // ReactiveElements must be wrapped.\n if (\n window.ShadyDOM &&\n window.ShadyDOM.inUse &&\n window.ShadyDOM.noPatch === true\n ) {\n window.ShadyDOM.patchElementProto(elementProto);\n }\n\n /**\n * Patch to apply adoptedStyleSheets via ShadyCSS\n */\n const createRenderRoot = elementProto.createRenderRoot;\n elementProto.createRenderRoot = function (this: PatchableReactiveElement) {\n // Pass the scope to render options so that it gets to lit-html for proper\n // scoping via ShadyCSS.\n const name = this.localName;\n // If using native Shadow DOM must adoptStyles normally,\n // otherwise do nothing.\n if (window.ShadyCSS!.nativeShadow) {\n return createRenderRoot.call(this);\n } else {\n if (!this.constructor.hasOwnProperty(SCOPED)) {\n (this.constructor as PatchableReactiveElementConstructor)[SCOPED] =\n true;\n // Use ShadyCSS's `prepareAdoptedCssText` to shim adoptedStyleSheets.\n const css = (\n this.constructor as PatchableReactiveElementConstructor\n ).elementStyles.map((v) =>\n v instanceof CSSStyleSheet\n ? Array.from(v.cssRules).reduce(\n (a: string, r: CSSRule) => (a += r.cssText),\n ''\n )\n : v.cssText\n );\n window.ShadyCSS?.ScopingShim?.prepareAdoptedCssText(css, name);\n if (this.constructor._$handlesPrepareStyles === undefined) {\n window.ShadyCSS!.prepareTemplateStyles(\n document.createElement('template'),\n name\n );\n }\n }\n
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