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7.1 KiB
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7.1 KiB
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{"version":3,"file":"polyfill-support.js","sources":["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._$handlesPrepareStyles === undefined) {\n window.ShadyCSS!.prepareTemplateStyles(\n document.createElement('template'),\n name\n );\n }\n }\n return (\n this.shadowRoot ??\n this.attachShadow(\n (this.constructor as PatchableReactiveElementConstructor)\n .shadowRootOptions\n )\n );\n }\n };\n\n /**\n * Patch connectedCallback to apply ShadyCSS custom properties shimming.\n */\n const connectedCallback = elementProto.connectedCallback;\n elementProto.connectedCallback = function (this: PatchableReactiveElement) {\n connectedCallback.call(this);\n // Note, must do first update separately so that we're ensured\n // that rendering has completed before calling this.\n if (this.hasUpdated) {\n window.ShadyCSS!.styleElement(this);\n }\n };\n\n /**\n * Patch update to apply ShadyCSS custom properties shimming for first\n * update.\n */\n const didUpdate = elementProto._$didUpdate;\n elementProto._$didUpdate = function (\n this: PatchableReactiveElement,\n changedProperties: unknown\n ) {\n // Note, must do first update here so rendering has completed before\n // calling this and styles are correct by updated/firstUpdated.\n if (!this.hasUpdated) {\n window.ShadyCSS!.styleElement(this);\n }\n didUpdate.call(this, changedProperties);\n };\n};\n\nif (DEV_MODE) {\n globalThis.reactiveElementPolyfillSupportDevMode ??= polyfillSupport;\n} else {\n globalThis.reactiveElementPolyfillSupport ??= polyfillSupport;\n}\n"],"names":["SCOPED","_b","globalThis","reactiveElementPolyfillSupport","_a","ReactiveElement","undefined","window","ShadyCSS","nativeShadow","ApplyShim","elementProto","prototype","ShadyDOM","inUse","noPatch","patchElementProto","createRenderRoot","name","this","localName","call","constructor","hasOwnProperty","css","elementStyles","map","v","CSSStyleSheet","Array","from","cssRules","reduce","a","r","cssText","ScopingShim","prepareAdoptedCssText","_$handlesPrepareStyles","prepareTemplateStyles","document","createElement","_c","shadowRoot","attachShadow","shadowRootOptions","connectedCallback","hasUpdated","styleElement","didUpdate","_$didUpdate","changedProperties"],"mappings":";;;;;aAyBMA,EAAS,WA0I4B,QAAzCC,EAAAC,WAAWC,sCAA8B,IAAAF,IAAzCC,WAAWC,+BA/GW,SAACC,GACvB,IAAAC,EAAeD,EAAAC,gBAOf,QACsBC,IAApBC,OAAOC,YACND,OAAOC,SAASC,cAAiBF,OAAOC,SAASE,WAFpD,CAYA,IAAMC,EAAeN,EAAgBO,UAKnCL,OAAOM,UACPN,OAAOM,SAASC,QACY,IAA5BP,OAAOM,SAASE,SAEhBR,OAAOM,SAASG,kBAAkBL,GAMpC,IAAMM,EAAmBN,EAAaM,iBACtCN,EAAaM,iBAAmB,qBAGxBC,EAAOC,KAAKC,UAGlB,GAAIb,OAAOC,SAAUC,aACnB,OAAOQ,EAAiBI,KAAKF,MAE7B,IAAKA,KAAKG,YAAYC,eAAevB,GAAS,CAC3CmB,KAAKG,YAAoDtB,IACxD,EAEF,IAAMwB,EACJL,KAAKG,YACLG,cAAcC,KAAI,SAACC,GACnB,OAAAA,aAAaC,cACTC,MAAMC,KAAKH,EAAEI,UAAUC,QACrB,SAACC,EAAWC,GAAe,OAACD,EAAKC,EAAEC,OAAQ,GAC3C,IAEFR,EAAEQ,OALN,IAO4B,QAA9BlC,EAAiB,QAAjBG,EAAAG,OAAOC,gBAAU,IAAAJ,OAAA,EAAAA,EAAAgC,mBAAa,IAAAnC,GAAAA,EAAAoC,sBAAsBb,EAAKN,QACTZ,IAA5Ca,KAAKG,YAAYgB,MACnB/B,OAAOC,SAAU+B,sBACfC,SAASC,cAAc,YACvBvB,EAGL,CACD,OACiB,QAAfwB,EAAAvB,KAAKwB,kBAAU,IAAAD,EAAAA,EACfvB,KAAKyB,aACFzB,KAAKG,YACHuB,kBAIX,EAKA,IAAMC,EAAoBnC,EAAamC,kBACvCnC,EAAamC,kBAAoB,WAC/BA,EAAkBzB,KAAKF,MAGnBA,KAAK4B,YACPxC,OAAOC,SAAUwC,aAAa7B,KAElC,EAMA,IAAM8B,EAAYtC,EAAauC,KAC/BvC,EAAauC,KAAc,SAEzBC,GAIKhC,KAAK4B,YACRxC,OAAOC,SAAUwC,aAAa7B,MAEhC8B,EAAU5B,KAAKF,KAAMgC,EACvB,CA5FC,CA6FH"} |