1  var baseMerge = require('./_baseMerge'),
 2      isObject = require('./isObject');
 3  
 4  /**
 5   * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
 6   * objects into destination objects that are passed thru.
 7   *
 8   * @private
 9   * @param {*} objValue The destination value.
10   * @param {*} srcValue The source value.
11   * @param {string} key The key of the property to merge.
12   * @param {Object} object The parent object of `objValue`.
13   * @param {Object} source The parent object of `srcValue`.
14   * @param {Object} [stack] Tracks traversed source values and their merged
15   *  counterparts.
16   * @returns {*} Returns the value to assign.
17   */
18  function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
19    if (isObject(objValue) && isObject(srcValue)) {
20      // Recursively merge objects and arrays (susceptible to call stack limits).
21      stack.set(srcValue, objValue);
22      baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
23      stack['delete'](srcValue);
24    }
25    return objValue;
26  }
27  
28  module.exports = customDefaultsMerge;