mirror of
https://github.com/wassname/template.git
synced 2026-07-01 19:15:33 +08:00
Shan Carter
33 lines
1.4 KiB
JavaScript
33 lines
1.4 KiB
JavaScript
/**
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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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* Because `new.target` is a syntax error in VMs that don't support it, this
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* shim must only be loaded in browsers that do.
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*/
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(() => {
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let origHTMLElement = HTMLElement;
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// TODO(justinfagnani): Tests!!
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window.HTMLElement = function() {
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// prefer new.target for elements that call super() constructors or
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// Reflect.construct directly
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let newTarget = new.target || this.constructor;
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return Reflect.construct(origHTMLElement, [], newTarget);
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}
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HTMLElement.prototype = Object.create(origHTMLElement.prototype, {
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constructor: {value: HTMLElement, configurable: true, writable: true},
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});
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})();
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