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"use strict";
/**
 * @license
 * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
/**
 * This shim allows elements written in, or compiled to, ES5 to work on native
 * implementations of Custom Elements v1. It sets new.target to the value of
 * this.constructor so that the native HTMLElement constructor can access the
 * current under-construction element's definition.
 */
(function () {
    if (
    // No Reflect, no classes, no need for shim because native custom elements
    // require ES2015 classes or Reflect.
    window.Reflect === undefined || window.customElements === undefined ||
        // The webcomponentsjs custom elements polyfill doesn't require
        // ES2015-compatible construction (`super()` or `Reflect.construct`).
        window.customElements.polyfillWrapFlushCallback) {
        return;
    }
    const BuiltInHTMLElement = HTMLElement;
    /**
     * With jscompiler's RECOMMENDED_FLAGS the function name will be optimized away.
     * However, if we declare the function as a property on an object literal, and
     * use quotes for the property name, then closure will leave that much intact,
     * which is enough for the JS VM to correctly set Function.prototype.name.
     */
    const wrapperForTheName = {
        'HTMLElement': function HTMLElement() {
            return Reflect.construct(BuiltInHTMLElement, [], this.constructor);
        }
    };
    window.HTMLElement =
        wrapperForTheName['HTMLElement'];
    HTMLElement.prototype = BuiltInHTMLElement.prototype;
    HTMLElement.prototype.constructor = HTMLElement;
    Object.setPrototypeOf(HTMLElement, BuiltInHTMLElement);
})();
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