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https://github.com/dillonkearns/elm-pages-v3-beta.git
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50 lines
2.1 KiB
JavaScript
50 lines
2.1 KiB
JavaScript
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/**
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* @license
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* Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
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* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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* Code distributed by Google as part of the polymer project is also
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* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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*/
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/**
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* This shim allows elements written in, or compiled to, ES5 to work on native
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* implementations of Custom Elements v1. It sets new.target to the value of
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* this.constructor so that the native HTMLElement constructor can access the
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* current under-construction element's definition.
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*/
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(function() {
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if (
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// No Reflect, no classes, no need for shim because native custom elements
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// require ES2015 classes or Reflect.
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window.Reflect === undefined ||
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window.customElements === undefined ||
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// The webcomponentsjs custom elements polyfill doesn't require
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// ES2015-compatible construction (`super()` or `Reflect.construct`).
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window.customElements.polyfillWrapFlushCallback
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) {
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return;
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}
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const BuiltInHTMLElement = HTMLElement;
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/**
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* With jscompiler's RECOMMENDED_FLAGS the function name will be optimized away.
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* However, if we declare the function as a property on an object literal, and
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* use quotes for the property name, then closure will leave that much intact,
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* which is enough for the JS VM to correctly set Function.prototype.name.
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*/
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const wrapperForTheName = {
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HTMLElement: /** @this {!Object} */ function HTMLElement() {
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return Reflect.construct(
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BuiltInHTMLElement,
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[],
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/** @type {!Function} */ (this.constructor)
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);
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}
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};
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window.HTMLElement = wrapperForTheName["HTMLElement"];
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HTMLElement.prototype = BuiltInHTMLElement.prototype;
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HTMLElement.prototype.constructor = HTMLElement;
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Object.setPrototypeOf(HTMLElement, BuiltInHTMLElement);
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})();
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