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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  get localName() {\n    return (this.constructor as NamedCustomHTMLElementConstructor).__localName;\n  }\n  get tagName() {\n    return this.localName?.toUpperCase();\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  toggleAttribute(name: string, force?: boolean): boolean {\n    // Steps reference https://dom.spec.whatwg.org/#dom-element-toggleattribute\n    if (this.hasAttribute(name)) {\n      // Step 5\n      if (force === undefined || !force) {\n        this.removeAttribute(name);\n        return false;\n      }\n    } else {\n      // Step 4\n      if (force === undefined || force) {\n        // Step 4.1\n        this.setAttribute(name, '');\n        return true;\n      } else {\n        // Step 4.2\n        return false;\n      }\n    }\n    // Step 6\n    return true;\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\ninterface NamedCustomHTMLElementConstructor\n  extends CustomHTMLElementConstructor {\n  __localName: string;\n}\n\ntype CustomElementRegistration = {\n  ctor: {new (): HTMLElement};\n  observedAttributes: string[];\n};\n\nconst CustomElementRegistryShim = class CustomElementRegistry {\n  private __definitions = new Map();\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    // Provide tagName and localName for the component.\n    (ctor as NamedCustomHTMLElementConstructor).__localName = name;\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"]}