/
ownkeys.js
55 lines (50 loc) · 1.68 KB
/
ownkeys.js
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/*
* 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';
'require es6/object/getownpropertysymbols';
$jscomp.polyfill('Reflect.ownKeys',
/**
* @param {*} orig
* @return {*}
* @suppress {reportUnknownTypes}
*/
function(orig) {
if (orig) return orig;
var symbolPrefix = 'jscomp_symbol_';
function isSymbol(key) {
return key.substring(0, symbolPrefix.length) == symbolPrefix;
}
/**
* Polyfill for Reflect.ownKeys() method:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/ownKeys
*
* Returns an array of the object's own property keys.
*
* @param {!Object} target
* @return {!Array<(string|symbol)>}
*/
var polyfill = function(target) {
var keys = [];
var names = Object.getOwnPropertyNames(target);
var symbols = Object.getOwnPropertySymbols(target);
for (var i = 0; i < names.length; i++) {
(isSymbol(names[i]) ? symbols : keys).push(names[i]);
}
return keys.concat(symbols);
};
return polyfill;
}, 'es6', 'es5'); // ES5: Requires Object.getOwnPropertyNames