com.google.javascript.jscomp.js.es6.reflect.defineproperty.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';
'require es6/reflect/reflect';
$jscomp.polyfill('Reflect.defineProperty', function(orig) {
if (orig) return orig;
/**
* Polyfill for Reflect.defineProperty() method:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/defineProperty
*
* Version of Object.defineProperty that returns a boolean.
*
* @param {!Object} target Target on which to define the property.
* @param {string} propertyKey Name of the property to define.
* @param {!ObjectPropertyDescriptor} attributes Property attributes.
* @return {boolean} Whether the property was defined.
*/
var polyfill = function(target, propertyKey, attributes) {
try {
Object.defineProperty(target, propertyKey, attributes);
var desc = Object.getOwnPropertyDescriptor(target, propertyKey);
if (!desc) return false;
return desc.configurable === (attributes.configurable || false) &&
desc.enumerable === (attributes.enumerable || false) &&
('value' in desc ?
desc.value === attributes.value &&
desc.writable === (attributes.writable || false) :
desc.get === attributes.get &&
desc.set === attributes.set);
} catch (err) {
return false;
}
};
return polyfill;
}, 'es6', 'es5'); // ES5: Requires Object.defineProperty