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define(['./_baseAssignValue', './eq'], function(baseAssignValue, eq) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /** Used for built-in method references. */  var objectProto = Object.prototype;
  /** Used to check objects for own properties. */  var hasOwnProperty = objectProto.hasOwnProperty;
  /**   * Assigns `value` to `key` of `object` if the existing value is not equivalent   * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)   * for equality comparisons.   *   * @private   * @param {Object} object The object to modify.   * @param {string} key The key of the property to assign.   * @param {*} value The value to assign.   */  function assignValue(object, key, value) {    var objValue = object[key];    if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||        (value === undefined && !(key in object))) {      baseAssignValue(object, key, value);    }  }
  return assignValue;});