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{"version":3,"file":"reactive-element.js","sources":["../../src/reactive-element.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2017 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\n/**\n * Use this module if you want to create your own base class extending\n * {@link ReactiveElement}.\n * @packageDocumentation\n */\n\nimport {\n getCompatibleStyle,\n adoptStyles,\n CSSResultGroup,\n CSSResultOrNative,\n} from './css-tag.js';\nimport type {\n ReactiveController,\n ReactiveControllerHost,\n} from './reactive-controller.js';\n\n// In the Node build, this import will be injected by Rollup:\n// import {HTMLElement, customElements} from '@lit-labs/ssr-dom-shim';\n\nexport * from './css-tag.js';\nexport type {\n ReactiveController,\n ReactiveControllerHost,\n} from './reactive-controller.js';\n\nconst NODE_MODE = false;\nconst global = NODE_MODE ? globalThis : window;\n\nif (NODE_MODE) {\n global.customElements ??= customElements;\n}\n\nconst DEV_MODE = true;\n\nlet requestUpdateThenable: (name: string) => {\n then: (\n onfulfilled?: (value: boolean) => void,\n _onrejected?: () => void\n ) => void;\n};\n\nlet issueWarning: (code: string, warning: string) => void;\n\nconst trustedTypes = (global as unknown as {trustedTypes?: {emptyScript: ''}})\n .trustedTypes;\n\n// Temporary workaround for https://crbug.com/993268\n// Currently, any attribute starting with \"on\" is considered to be a\n// TrustedScript source. Such boolean attributes must be set to the equivalent\n// trusted emptyScript value.\nconst emptyStringForBooleanAttribute = trustedTypes\n ? (trustedTypes.emptyScript as unknown as '')\n : '';\n\nconst polyfillSupport = DEV_MODE\n ? global.reactiveElementPolyfillSupportDevMode\n : global.reactiveElementPolyfillSupport;\n\nif (DEV_MODE) {\n // Ensure warnings are issued only 1x, even if multiple versions of Lit\n // are loaded.\n const issuedWarnings: Set<string | undefined> = (global.litIssuedWarnings ??=\n new Set());\n\n // Issue a warning, if we haven't already.\n issueWarning = (code: string, warning: string) => {\n warning += ` See https://lit.dev/msg/${code} for more information.`;\n if (!issuedWarnings.has(warning)) {\n console.warn(warning);\n issuedWarnings.add(warning);\n }\n };\n\n issueWarning(\n 'dev-mode',\n `Lit is in dev mode. Not recommended for production!`\n );\n\n // Issue polyfill support warning.\n if (global.ShadyDOM?.inUse && polyfillSupport === undefined) {\n issueWarning(\n 'polyfill-support-missing',\n `Shadow DOM is being polyfilled via \\`ShadyDOM\\` but ` +\n `the \\`polyfill-support\\` module has not been loaded.`\n );\n }\n\n requestUpdateThenable = (name) => ({\n then: (\n onfulfilled?: (value: boolean) => void,\n _onrejected?: () => void\n ) => {\n issueWarning(\n 'request-update-promise',\n `The \\`requestUpdate\\` method should no longer return a Promise but ` +\n `does so on \\`${name}\\`. Use \\`updateComplete\\` instead.`\n );\n if (onfulfilled !== undefined) {\n onfulfilled(false);\n }\n },\n });\n}\n\n/**\n * Contains types that are part of the unstable debug API.\n *\n * Everything in this API is not stable and may change or be removed in the future,\n * even on patch releases.\n */\n// eslint-disable-next-line @typescript-eslint/no-namespace\nexport namespace ReactiveUnstable {\n /**\n * When Lit is running in dev mode and `window.emitLitDebugLogEvents` is true,\n * we will emit 'lit-debug' events to window, with live details about the update and render\n * lifecycle. These can be useful for writing debug tooling and visualizations.\n *\n * Please be aware that running with window.emitLitDebugLogEvents has performance overhead,\n * making certain operations that are normally very cheap (like a no-op render) much slower,\n * because we must copy data and dispatch events.\n */\n // eslint-disable-next-line @typescript-eslint/no-namespace\n export namespace DebugLog {\n export type Ent
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