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var Stack = require('./_Stack'),    assignMergeValue = require('./_assignMergeValue'),    baseFor = require('./_baseFor'),    baseMergeDeep = require('./_baseMergeDeep'),    isObject = require('./isObject'),    keysIn = require('./keysIn'),    safeGet = require('./_safeGet');
/** * 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);}
module.exports = baseMerge;