com.google.javascript.jscomp.js.es6.object.setprototypeof.js Maven / Gradle / Ivy
/*
* Copyright 2016 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'require util/polyfill';
$jscomp.polyfill('Object.setPrototypeOf', function(orig) {
if (orig) return orig;
// IE<11 has no way to polyfill this, so don't even try.
if (typeof ''.__proto__ != 'object') return null;
/**
* Polyfill for Object.setPrototypeOf() method:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
*
* Sets the prototype in a "standard" way.
*
* @param {!Object} target Target on which to get the property.
* @param {?Object} proto The new prototype.
* @return {!Object}
*/
var polyfill = function(target, proto) {
target.__proto__ = proto;
if (target.__proto__ !== proto) {
throw new TypeError(target + ' is not extensible');
}
return target;
};
return polyfill;
}, 'es6', 'es5');