/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 * @provides Object.es6
 * @polyfill
 */

// https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign

if (!Object.assign) {
  Object.assign = function(target, sources) {
    if (target === null || target === undefined) {
      throw new TypeError('Object.assign target cannot be null or undefined');
    }

    var to = Object(target);
    var hasOwnProperty = Object.prototype.hasOwnProperty;

    for (var nextIndex = 1; nextIndex < arguments.length; nextIndex++) {
      var nextSource = arguments[nextIndex];
      if (nextSource === null || nextSource === undefined) {
        continue;
      }

      var from = Object(nextSource);

      // We don't currently support accessors nor proxies. Therefore this
      // copy cannot throw. If we ever supported this then we must handle
      // exceptions and side-effects.

      for (var key in from) {
        if (hasOwnProperty.call(from, key)) {
          to[key] = from[key];
        }
      }
    }

    return to;
  };
}