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define(['./_Stack', './_assignMergeValue', './_baseFor', './_baseMergeDeep', './isObject', './keysIn', './_safeGet'], function(Stack, assignMergeValue, baseFor, baseMergeDeep, isObject, keysIn, safeGet) {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /**   * The base implementation of `_.merge` without support for multiple sources.   *   * @private   * @param {Object} object The destination object.   * @param {Object} source The source object.   * @param {number} srcIndex The index of `source`.   * @param {Function} [customizer] The function to customize merged values.   * @param {Object} [stack] Tracks traversed source values and their merged   *  counterparts.   */  function baseMerge(object, source, srcIndex, customizer, stack) {    if (object === source) {      return;    }    baseFor(source, function(srcValue, key) {      stack || (stack = new Stack);      if (isObject(srcValue)) {        baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);      }      else {        var newValue = customizer          ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)          : undefined;
        if (newValue === undefined) {          newValue = srcValue;        }        assignMergeValue(object, key, newValue);      }    }, keysIn);  }
  return baseMerge;});