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define(['./_copyObject', './_createAssigner', './keysIn'], function(copyObject, createAssigner, keysIn) {
  /**   * This method is like `_.assign` except that it iterates over own and   * inherited source properties.   *   * **Note:** This method mutates `object`.   *   * @static   * @memberOf _   * @since 4.0.0   * @alias extend   * @category Object   * @param {Object} object The destination object.   * @param {...Object} [sources] The source objects.   * @returns {Object} Returns `object`.   * @see _.assign   * @example   *   * function Foo() {   *   this.a = 1;   * }   *   * function Bar() {   *   this.c = 3;   * }   *   * Foo.prototype.b = 2;   * Bar.prototype.d = 4;   *   * _.assignIn({ 'a': 0 }, new Foo, new Bar);   * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }   */  var assignIn = createAssigner(function(object, source) {    copyObject(source, keysIn(source), object);  });
  return assignIn;});