Function baseMergeDeep

test-app/public/sinon.js:14264–14324

* A specialized version of `baseMerge` for arrays and objects which performs * deep merges and tracks traversed objects enabling objects with circular * references to be merged. * * @private * @param {Object} object The destination object. * @par

(object, source, key, srcIndex, mergeFunc, customizer, stack)

         *  counterparts.
         */
        function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
          var objValue = safeGet(object, key),
              srcValue = safeGet(source, key),
              stacked = stack.get(srcValue);
    
          if (stacked) {
            assignMergeValue(object, key, stacked);
            return;
          }
          var newValue = customizer
            ? customizer(objValue, srcValue, (key + ''), object, source, stack)
            : undefined;
    
          var isCommon = newValue === undefined;
    
          if (isCommon) {
            var isArr = isArray(srcValue),
                isBuff = !isArr && isBuffer(srcValue),
                isTyped = !isArr && !isBuff && isTypedArray(srcValue);
    
            newValue = srcValue;
            if (isArr || isBuff || isTyped) {
              if (isArray(objValue)) {
                newValue = objValue;
              }
              else if (isArrayLikeObject(objValue)) {
                newValue = copyArray(objValue);
              }
              else if (isBuff) {
                isCommon = false;
                newValue = cloneBuffer(srcValue, true);
              }
              else if (isTyped) {
                isCommon = false;
                newValue = cloneTypedArray(srcValue, true);
              }
              else {
                newValue = [];
              }
            }
            else if (isPlainObject(srcValue) || isArguments(srcValue)) {
              newValue = objValue;
              if (isArguments(objValue)) {
                newValue = toPlainObject(objValue);
              }
              else if (!isObject(objValue) || isFunction(objValue)) {
                newValue = initCloneObject(srcValue);
              }
            }
            else {
              isCommon = false;
            }
          }
          if (isCommon) {
            // Recursively merge objects and arrays (susceptible to call stack limits).
            stack.set(srcValue, newValue);
            mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
            stack['delete'](srcValue);