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Viewing / Editing File: _customDefaultsMerge.js

var baseMerge = require('./_baseMerge'),
    isObject = require('./isObject');

/**
 * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
 * objects into destination objects that are passed thru.
 *
 * @private
 * @param {*} objValue The destination value.
 * @param {*} srcValue The source value.
 * @param {string} key The key of the property to merge.
 * @param {Object} object The parent object of `objValue`.
 * @param {Object} source The parent object of `srcValue`.
 * @param {Object} [stack] Tracks traversed source values and their merged
 *  counterparts.
 * @returns {*} Returns the value to assign.
 */
function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
  if (isObject(objValue) && isObject(srcValue)) {
    // Recursively merge objects and arrays (susceptible to call stack limits).
    stack.set(srcValue, objValue);
    baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
    stack['delete'](srcValue);
  }
  return objValue;
}

module.exports = customDefaultsMerge;

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