diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 876547fd6..588eb0300 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -4331,13 +4331,130 @@ result = <{}>_(testCreateProto).create(testCreateProps).value();
 result = <TestCreateProto>_(testCreateProto).create<TestCreateProto>().value();
 result = <TestCreateTResult>_(testCreateProto).create<TestCreateTResult>(testCreateProps).value();
 
-interface Food {
-    name: string;
-    type: string;
+// _.defaults
+module TestDefaults {
+    interface Obj {a: string};
+    interface S1 {a: number};
+    interface S2 {b: number};
+    interface S3 {c: number};
+    interface S4 {d: number};
+    interface S5 {e: number};
+
+    let obj: Obj;
+    let s1: S1;
+    let s2: S2;
+    let s3: S3;
+    let s4: S4;
+    let s5: S5;
+
+    {
+        let result: Obj;
+
+        result = _.defaults<Obj>(obj);
+    }
+
+    {
+        let result: {a: string};
+
+        result = _.defaults<Obj, S1, {a: string}>(obj, s1);
+    }
+
+    {
+        let result: {a: string, b: number};
+
+        result = _.defaults<Obj, S1, S2, {a: string, b: number}>(obj, s1, s2);
+    }
+
+    {
+        let result: {a: string, b: number, c: number};
+
+        result = _.defaults<Obj, S1, S2, S3, {a: string, b: number, c: number}>(obj, s1, s2, s3);
+    }
+
+    {
+        let result: {a: string, b: number, c: number, d: number};
+
+        result = _.defaults<Obj, S1, S2, S3, S4, {a: string, b: number, c: number, d: number}>(obj, s1, s2, s3, s4);
+    }
+
+    {
+        let result: {a: string, b: number, c: number, d: number, e: number};
+
+        result = _.defaults<Obj, {a: string, b: number, c: number, d: number, e: number}>(obj, s1, s2, s3, s4, s5);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<Obj>;
+
+        result = _(obj).defaults();
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: string}>;
+
+        result = _(obj).defaults<S1, {a: string}>(s1);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: string, b: number}>;
+
+        result = _(obj).defaults<S1, S2, {a: string, b: number}>(s1, s2);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: string, b: number, c: number}>;
+
+        result = _(obj).defaults<S1, S2, S3, {a: string, b: number, c: number}>(s1, s2, s3);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: string, b: number, c: number, d: number}>;
+
+        result = _(obj).defaults<S1, S2, S3, S4, {a: string, b: number, c: number, d: number}>(s1, s2, s3, s4);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: string, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).defaults<{a: string, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<Obj>;
+
+        result = _(obj).chain().defaults();
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: string}>;
+
+        result = _(obj).chain().defaults<S1, {a: string}>(s1);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: string, b: number}>;
+
+        result = _(obj).chain().defaults<S1, S2, {a: string, b: number}>(s1, s2);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: string, b: number, c: number}>;
+
+        result = _(obj).chain().defaults<S1, S2, S3, {a: string, b: number, c: number}>(s1, s2, s3);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: string, b: number, c: number, d: number}>;
+
+        result = _(obj).chain().defaults<S1, S2, S3, S4, {a: string, b: number, c: number, d: number}>(s1, s2, s3, s4);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: string, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).chain().defaults<{a: string, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5);
+    }
 }
-var foodDefaults = { 'name': 'apple' };
-result = <Food>_.defaults(foodDefaults, { 'name': 'banana', 'type': 'fruit' });
-result = <_.LoDashImplicitObjectWrapper<Food>>_(foodDefaults).defaults({ 'name': 'banana', 'type': 'fruit' });
 
 //_.defaultsDeep
 interface DefaultsDeepResult {
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 359cc0fb9..fc26d183a 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -9135,23 +9135,170 @@ declare module _ {
     //_.defaults
     interface LoDashStatic {
         /**
-        * Assigns own enumerable properties of source object(s) to the destination object for all
-        * destination properties that resolve to undefined. Once a property is set, additional defaults
-        * of the same property will be ignored.
-        * @param object The destination object.
-        * @param sources The source objects.
-        * @return The destination object.
-        **/
-        defaults<T, TResult>(
-            object: T,
-            ...sources: any[]): TResult;
+         * Assigns own enumerable properties of source object(s) to the destination object for all destination
+         * properties that resolve to undefined. Once a property is set, additional values of the same property are
+         * ignored.
+         *
+         * Note: This method mutates object.
+         *
+         * @param object The destination object.
+         * @param sources The source objects.
+         * @return The destination object.
+         */
+        defaults<Obj extends {}, TResult extends {}>(
+            object: Obj,
+            ...sources: {}[]
+        ): TResult;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<Obj extends {}, S1 extends {}, TResult extends {}>(
+            object: Obj,
+            source1: S1,
+            ...sources: {}[]
+        ): TResult;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<Obj extends {}, S1 extends {}, S2 extends {}, TResult extends {}>(
+            object: Obj,
+            source1: S1,
+            source2: S2,
+            ...sources: {}[]
+        ): TResult;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<Obj extends {}, S1 extends {}, S2 extends {}, S3 extends {}, TResult extends {}>(
+            object: Obj,
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            ...sources: {}[]
+        ): TResult;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<Obj extends {}, S1 extends {}, S2 extends {}, S3 extends {}, S4 extends {}, TResult extends {}>(
+            object: Obj,
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            source4: S4,
+            ...sources: {}[]
+        ): TResult;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<TResult extends {}>(
+            object: {},
+            ...sources: {}[]
+        ): TResult;
     }
 
     interface LoDashImplicitObjectWrapper<T> {
         /**
-        * @see _.defaults
-        **/
-        defaults<T, TResult>(...sources: any[]): LoDashImplicitObjectWrapper<TResult>
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, TResult extends {}>(
+            source1: S1,
+            ...sources: {}[]
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            ...sources: {}[]
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, S3 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            ...sources: {}[]
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, S3 extends {}, S4 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            source4: S4,
+            ...sources: {}[]
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults(): LoDashImplicitObjectWrapper<T>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<TResult>(...sources: {}[]): LoDashImplicitObjectWrapper<TResult>;
+    }
+
+    interface LoDashExplicitObjectWrapper<T> {
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, TResult extends {}>(
+            source1: S1,
+            ...sources: {}[]
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            ...sources: {}[]
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, S3 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            ...sources: {}[]
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<S1 extends {}, S2 extends {}, S3 extends {}, S4 extends {}, TResult extends {}>(
+            source1: S1,
+            source2: S2,
+            source3: S3,
+            source4: S4,
+            ...sources: {}[]
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults(): LoDashExplicitObjectWrapper<T>;
+
+        /**
+         * @see _.defaults
+         */
+        defaults<TResult>(...sources: {}[]): LoDashExplicitObjectWrapper<TResult>;
     }
 
     //_.defaultsDeep