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We want the `name` of the shim classes to match the real ones at runtime,\n// hence e.g. `class Element`.\n// 2. We can't shadow the global types with a simple class declaration, because\n// then we can't reference the global types for casting, hence e.g.\n// `const ElementShim = class Element`.\n// 3. We want to export the classes typed as the real ones, hence e.g.\n// `const ElementShimWithRealType = ElementShim as object as typeof Element;`.\n// 4. We want the exported names to match the real ones, hence e.g.\n// `export {ElementShimWithRealType as Element}`.\nconst ElementShim = class Element {\n get attributes() {\n return Array.from(attributesForElement(this)).map(([name, value]) => ({\n name,\n value,\n }));\n }\n private __shadowRootMode: null | ShadowRootMode = null;\n protected __shadowRoot: null | ShadowRoot = null;\n protected __internals: null | ElementInternals = null;\n\n get shadowRoot() {\n if (this.__shadowRootMode === 'closed') {\n return null;\n }\n return this.__shadowRoot;\n }\n setAttribute(name: string, value: unknown): void {\n // Emulate browser behavior that silently casts all values to string. E.g.\n // `42` becomes `\"42\"` and `{}` becomes `\"[object Object]\"\"`.\n attributesForElement(this).set(name, String(value));\n }\n removeAttribute(name: string) {\n attributesForElement(this).delete(name);\n }\n hasAttribute(name: string) {\n return attributesForElement(this).has(name);\n }\n attachShadow(init: ShadowRootInit): ShadowRoot {\n const shadowRoot = {host: this} as object as ShadowRoot;\n this.__shadowRootMode = init.mode;\n if (init && init.mode === 'open') {\n this.__shadowRoot = shadowRoot;\n }\n return shadowRoot;\n }\n attachInternals(): ElementInternals {\n if (this.__internals !== null) {\n throw new Error(\n `Failed to execute 'attachInternals' on 'HTMLElement': ` +\n `ElementInternals for the specified element was already attached.`\n );\n }\n const internals = new ElementInternalsShim(this as unknown as HTMLElement);\n this.__internals = internals;\n return internals as ElementInternals;\n }\n getAttribute(name: string) {\n const value = attributesForElement(this).get(name);\n return value ?? null;\n }\n};\nconst ElementShimWithRealType = ElementShim as object as typeof Element;\nexport {ElementShimWithRealType as Element};\n\nconst HTMLElementShim = class HTMLElement extends ElementShim {};\nconst HTMLElementShimWithRealType =\n HTMLElementShim as object as typeof HTMLElement;\nexport {HTMLElementShimWithRealType as HTMLElement};\n\ninterface CustomHTMLElementConstructor {\n new (): HTMLElement;\n observedAttributes?: string[];\n}\n\ntype CustomElementRegistration = {\n ctor: {new (): HTMLElement};\n observedAttributes: string[];\n};\n\nconst CustomElementRegistryShim = class CustomElementRegistry {\n private __definitions = new Map<string, CustomElementRegistration>();\n\n define(name: string, ctor: CustomHTMLElementConstructor) {\n if (this.__definitions.has(name)) {\n if (process.env.NODE_ENV === 'development') {\n console.warn(\n `'CustomElementRegistry' already has \"${name}\" defined. ` +\n `This may have been caused by live reload or hot module ` +\n `replacement in which case it can be safely ignored.\\n` +\n `Make sure to test your application with a production build as ` +\n `repeat registrations will throw in production.`\n );\n } else {\n throw new Error(\n `Failed to execute 'define' on 'CustomElementRegistry': ` +\n `the name \"${name}\" has already been used with this registry`\n );\n }\n }\n this.__definitions.set(name, {\n ctor,\n // Note it's important we read `observedAttributes` in case it is a getter\n // with side-effects, as is the case in Lit, where it triggers class\n // finalization.\n //\n // TODO(aomarks) To be spec compliant, we should also capture the\n // registration-time lifecycle methods like `connectedCallback`. For them\n // to be actually accessible to e.g. the Lit SSR element renderer, though,\n // we'd need to introduce a new API for accessing them (since `get` only\n // returns the constructor).\n observedAttributes: ctor.observedAttributes ?? [],\n });\n }\n\n get(name: string) {\n const definition = this.__definitions.get(name);\n return definition?.ctor;\n }\n};\nconst CustomElementRegistryShimWithRealType =\n CustomElementRegistryShim as object as typeof CustomElementRegistry;\nexport {CustomElementRegistryShimWithRealType as CustomElementRegistry};\n\nexport const customElements = new CustomElementRegistryShimWithRealType();\n"]} |