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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2018 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.
 */

/**
 * @fileoverview
 * @suppress {uselessCode}
 */
'require util/owns';
'require util/polyfill';
'require util/shouldpolyfill';

/**
 * Equivalent to the Object.assign() method, but guaranteed to be available for use in code
 * generated by the compiler.
 *
 * 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.
 *
 * @final
 * @param {!Object} target The target object onto which to copy.
 * @param {...?Object} var_args The source objects.
 * @return {!Object} The target object is returned.
 */
$jscomp.assign =
    ($jscomp.TRUST_ES6_POLYFILLS && typeof Object.assign == 'function') ?
    Object.assign :
    /**
     * @param {!Object} target
     * @param {...?Object} var_args
     * @return {!Object}
     * @suppress {reportUnknownTypes}
     */
    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;
    };