com.google.javascript.jscomp.js.es6.object.assign.js Maven / Gradle / Ivy

Go to download
/*
 * 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/owns';
'require util/polyfill';

$jscomp.polyfill('Object.assign', function(orig) {
  if (orig) return orig;

  /**
   * Polyfill for Object.assign() method:
   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
   *
   * Copies values of all enumerable own properties from one or more
   * sources to the given target object, and returns the target.
   * @param {!Object} target The target object onto which to copy.
   * @param {...?Object} var_args The source objects.
   * @return {!Object} The target object is returned.
   * @suppress {reportUnknownTypes}
   */
  var polyfill = function(target, var_args) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];
      if (!source) continue;
      for (var key in source) {
        if ($jscomp.owns(source, key)) target[key] = source[key];
      }
    }
    return target;
  };

  return polyfill;
}, 'es6', 'es3');