Bump to v4.0.0.

merge.js

@@ -0,0 +1,37 @@
+import baseMerge from './internal/baseMerge';
+import createAssigner from './internal/createAssigner';
+
+/**
+ * Recursively merges own and inherited enumerable properties of source
+ * objects into the destination object, skipping source properties that resolve
+ * to `undefined`. Array and plain object properties are merged recursively.
+ * Other objects and value types are overridden by assignment. Source objects
+ * are applied from left to right. Subsequent sources overwrite property
+ * assignments of previous sources.
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The destination object.
+ * @param {...Object} [sources] The source objects.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var users = {
+ *   'data': [{ 'user': 'barney' }, { 'user': 'fred' }]
+ * };
+ *
+ * var ages = {
+ *   'data': [{ 'age': 36 }, { 'age': 40 }]
+ * };
+ *
+ * _.merge(users, ages);
+ * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
+ */
+var merge = createAssigner(function(object, source) {
+  baseMerge(object, source);
+});
+
+export default merge;