lodash: added _.defaultsDeep() method

lodash/lodash-tests.ts

@@ -896,6 +896,18 @@ var foodDefaults = { 'name': 'apple' };
 result = <Food>_.defaults(foodDefaults, { 'name': 'banana', 'type': 'fruit' });
 result = <_.LoDashObjectWrapper<Food>>_(foodDefaults).defaults({ 'name': 'banana', 'type': 'fruit' });
 
+//_.defaultsDeep
+interface DefaultsDeepResult {
+    user: {
+        name: string;
+        age: number;
+    }
+}
+var TestDefaultsDeepObject = {'user': {'name': 'barney'}};
+var TestDefaultsDeepSource = {'user': {'name': 'fred', 'age': 36}};
+result = <DefaultsDeepResult>_.defaultsDeep(TestDefaultsDeepObject, TestDefaultsDeepSource);
+result = <DefaultsDeepResult>_(TestDefaultsDeepObject).defaultsDeep<DefaultsDeepResult>(TestDefaultsDeepSource).value();
+
 result = <string>_.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function (num) {
     return num % 2 == 0;
 });

lodash/lodash.d.ts

@@ -5564,6 +5564,26 @@ declare module _ {
         defaults<T, TResult>(...sources: any[]): LoDashObjectWrapper<TResult>
     }
 
+    //_.defaultsDeep
+    interface LoDashStatic {
+        /**
+         * This method is like _.defaults except that it recursively assigns default properties.
+         * @param object The destination object.
+         * @param sources The source objects.
+         * @return Returns object.
+         **/
+        defaultsDeep<T, TResult>(
+            object: T,
+            ...sources: any[]): TResult;
+    }
+
+    interface LoDashObjectWrapper<T> {
+        /**
+         * @see _.defaultsDeep
+         **/
+        defaultsDeep<TResult>(...sources: any[]): LoDashObjectWrapper<TResult>
+    }
+
     //_.findKey
     interface LoDashStatic {
         /**