From 5d0f0c9085c05c5ac1a06bf52d8cd0b87e4139fd Mon Sep 17 00:00:00 2001
From: Ilya Mochalov <chrootsu@gmail.com>
Date: Fri, 6 Nov 2015 02:19:46 +0500
Subject: [PATCH] lodash: signatures of the method _.assign have been changed

---
 lodash/lodash-tests.ts | 341 +++++++++++++++++++++++++---
 lodash/lodash.d.ts     | 499 +++++++++++++++++++++++++++--------------
 2 files changed, 649 insertions(+), 191 deletions(-)

diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 876547fd6..d86326259 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -4285,32 +4285,166 @@ module TestRandom {
     }
 }
 
-/*********
-* Object *
-**********/
-interface NameAge {
-    name: string;
-    age: number;
+/**********
+ * Object *
+ **********/
+
+// _.assign
+module TestAssign {
+    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 customizer: (objectValue: any, sourceValue: any, key?: string, object?: {}, source?: {}) => any;
+
+    {
+        let result: Obj;
+
+        result = _.assign<Obj>(obj);
+    }
+
+    {
+        let result: {a: number};
+
+        result = _.assign<Obj, S1, {a: number}>(obj, s1);
+        result = _.assign<Obj, S1, {a: number}>(obj, s1, customizer);
+        result = _.assign<Obj, S1, {a: number}>(obj, s1, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number};
+
+        result = _.assign<Obj, S1, S2, {a: number, b: number}>(obj, s1, s2);
+        result = _.assign<Obj, S1, S2, {a: number, b: number}>(obj, s1, s2, customizer);
+        result = _.assign<Obj, S1, S2, {a: number, b: number}>(obj, s1, s2, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number};
+
+        result = _.assign<Obj, S1, S2, S3, {a: number, b: number, c: number}>(obj, s1, s2, s3);
+        result = _.assign<Obj, S1, S2, S3, {a: number, b: number, c: number}>(obj, s1, s2, s3, customizer);
+        result = _.assign<Obj, S1, S2, S3, {a: number, b: number, c: number}>(obj, s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number, d: number};
+
+        result = _.assign<Obj, S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(obj, s1, s2, s3, s4);
+        result = _.assign<Obj, S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(obj, s1, s2, s3, s4, customizer);
+        result = _.assign<Obj, S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(obj, s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number, d: number, e: number};
+
+        result = _.assign<Obj, {a: number, b: number, c: number, d: number, e: number}>(obj, s1, s2, s3, s4, s5);
+        result = _.assign<Obj, {a: number, b: number, c: number, d: number, e: number}>(obj, s1, s2, s3, s4, s5, customizer);
+        result = _.assign<Obj, {a: number, b: number, c: number, d: number, e: number}>(obj, s1, s2, s3, s4, s5, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<Obj>;
+
+        result = _(obj).assign();
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number}>;
+
+        result = _(obj).assign<S1, {a: number}>(s1);
+        result = _(obj).assign<S1, {a: number}>(s1, customizer);
+        result = _(obj).assign<S1, {a: number}>(s1, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number}>;
+
+        result = _(obj).assign<S1, S2, {a: number, b: number}>(s1, s2);
+        result = _(obj).assign<S1, S2, {a: number, b: number}>(s1, s2, customizer);
+        result = _(obj).assign<S1, S2, {a: number, b: number}>(s1, s2, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number}>;
+
+        result = _(obj).assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3);
+        result = _(obj).assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3, customizer);
+        result = _(obj).assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number, d: number}>;
+
+        result = _(obj).assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4);
+        result = _(obj).assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4, customizer);
+        result = _(obj).assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5);
+        result = _(obj).assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5, customizer);
+        result = _(obj).assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<Obj>;
+
+        result = _(obj).chain().assign();
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number}>;
+
+        result = _(obj).chain().assign<S1, {a: number}>(s1);
+        result = _(obj).chain().assign<S1, {a: number}>(s1, customizer);
+        result = _(obj).chain().assign<S1, {a: number}>(s1, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number}>;
+
+        result = _(obj).chain().assign<S1, S2, {a: number, b: number}>(s1, s2);
+        result = _(obj).chain().assign<S1, S2, {a: number, b: number}>(s1, s2, customizer);
+        result = _(obj).chain().assign<S1, S2, {a: number, b: number}>(s1, s2, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number}>;
+
+        result = _(obj).chain().assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3);
+        result = _(obj).chain().assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3, customizer);
+        result = _(obj).chain().assign<S1, S2, S3, {a: number, b: number, c: number}>(s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number, d: number}>;
+
+        result = _(obj).chain().assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4);
+        result = _(obj).chain().assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4, customizer);
+        result = _(obj).chain().assign<S1, S2, S3, S4, {a: number, b: number, c: number, d: number}>(s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).chain().assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5);
+        result = _(obj).chain().assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5, customizer);
+        result = _(obj).chain().assign<{a: number, b: number, c: number, d: number, e: number}>(s1, s2, s3, s4, s5, customizer, any);
+    }
 }
-result = <NameAge>_.assign({ 'name': 'moe' }, { 'age': 40 });
-result = <NameAge>_.assign({ 'name': 'moe' }, { 'age': 40 }, function (a, b) {
-    return typeof a == 'undefined' ? b : a;
-});
-
-result = <_.LoDashImplicitObjectWrapper<NameAge>>_({ 'name': 'moe' }).assign({ 'age': 40 });
-result = <_.LoDashImplicitObjectWrapper<NameAge>>_({ 'name': 'moe' }).assign({ 'age': 40 }, function (a, b) {
-    return typeof a == 'undefined' ? b : a;
-});
-
-result = <NameAge>_.extend({ 'name': 'moe' }, { 'age': 40 });
-result = <NameAge>_.extend({ 'name': 'moe' }, { 'age': 40 }, function (a, b) {
-    return typeof a == 'undefined' ? b : a;
-});
-
-result = <_.LoDashImplicitObjectWrapper<NameAge>>_({ 'name': 'moe' }).extend({ 'age': 40 });
-result = <_.LoDashImplicitObjectWrapper<NameAge>>_({ 'name': 'moe' }).extend({ 'age': 40 }, function (a, b) {
-    return typeof a == 'undefined' ? b : a;
-});
 
 // _.create
 interface TestCreateProto {
@@ -4351,6 +4485,163 @@ var TestDefaultsDeepSource = {'user': {'name': 'fred', 'age': 36}};
 result = <DefaultsDeepResult>_.defaultsDeep(TestDefaultsDeepObject, TestDefaultsDeepSource);
 result = <DefaultsDeepResult>_(TestDefaultsDeepObject).defaultsDeep<DefaultsDeepResult>(TestDefaultsDeepSource).value();
 
+// _.extend
+module TestExtend {
+    type Obj = {a: string};
+    type S1 = {a: number};
+    type S2 = {b: number};
+    type S3 = {c: number};
+    type S4 = {d: number};
+    type S5 = {e: number};
+
+    let obj: Obj;
+    let s1: S1;
+    let s2: S2;
+    let s3: S3;
+    let s4: S4;
+    let s5: S5;
+
+    let customizer: (objectValue: any, sourceValue: any, key?: string, object?: {}, source?: {}) => any;
+
+    {
+        let result: Obj;
+
+        result = _.extend<Obj>(obj);
+    }
+
+    {
+        let result: {a: number};
+
+        result = _.extend<Obj, S1, Obj & S1>(obj, s1);
+        result = _.extend<Obj, S1, Obj & S1>(obj, s1, customizer);
+        result = _.extend<Obj, S1, Obj & S1>(obj, s1, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number};
+
+        result = _.extend<Obj, S1, S2, Obj & S1 & S2>(obj, s1, s2);
+        result = _.extend<Obj, S1, S2, Obj & S1 & S2>(obj, s1, s2, customizer);
+        result = _.extend<Obj, S1, S2, Obj & S1 & S2>(obj, s1, s2, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number};
+
+        result = _.extend<Obj, S1, S2, S3, Obj & S1 & S2 & S3>(obj, s1, s2, s3);
+        result = _.extend<Obj, S1, S2, S3, Obj & S1 & S2 & S3>(obj, s1, s2, s3, customizer);
+        result = _.extend<Obj, S1, S2, S3, Obj & S1 & S2 & S3>(obj, s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number, d: number};
+
+        result = _.extend<Obj, S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(obj, s1, s2, s3, s4);
+        result = _.extend<Obj, S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(obj, s1, s2, s3, s4, customizer);
+        result = _.extend<Obj, S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(obj, s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: {a: number, b: number, c: number, d: number, e: number};
+
+        result = _.extend<Obj, Obj & S1 & S2 & S3 & S4 & S5>(obj, s1, s2, s3, s4, s5);
+        result = _.extend<Obj, Obj & S1 & S2 & S3 & S4 & S5>(obj, s1, s2, s3, s4, s5, customizer);
+        result = _.extend<Obj, Obj & S1 & S2 & S3 & S4 & S5>(obj, s1, s2, s3, s4, s5, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<Obj>;
+
+        result = _(obj).extend();
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number}>;
+
+        result = _(obj).extend<S1, Obj & S1>(s1);
+        result = _(obj).extend<S1, Obj & S1>(s1, customizer);
+        result = _(obj).extend<S1, Obj & S1>(s1, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number}>;
+
+        result = _(obj).extend<S1, S2, Obj & S1 & S2>(s1, s2);
+        result = _(obj).extend<S1, S2, Obj & S1 & S2>(s1, s2, customizer);
+        result = _(obj).extend<S1, S2, Obj & S1 & S2>(s1, s2, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number}>;
+
+        result = _(obj).extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3);
+        result = _(obj).extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3, customizer);
+        result = _(obj).extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number, d: number}>;
+
+        result = _(obj).extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4);
+        result = _(obj).extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4, customizer);
+        result = _(obj).extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: _.LoDashImplicitObjectWrapper<{a: number, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5);
+        result = _(obj).extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5, customizer);
+        result = _(obj).extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<Obj>;
+
+        result = _(obj).chain().extend();
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number}>;
+
+        result = _(obj).chain().extend<S1, Obj & S1>(s1);
+        result = _(obj).chain().extend<S1, Obj & S1>(s1, customizer);
+        result = _(obj).chain().extend<S1, Obj & S1>(s1, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number}>;
+
+        result = _(obj).chain().extend<S1, S2, Obj & S1 & S2>(s1, s2);
+        result = _(obj).chain().extend<S1, S2, Obj & S1 & S2>(s1, s2, customizer);
+        result = _(obj).chain().extend<S1, S2, Obj & S1 & S2>(s1, s2, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number}>;
+
+        result = _(obj).chain().extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3);
+        result = _(obj).chain().extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3, customizer);
+        result = _(obj).chain().extend<S1, S2, S3, Obj & S1 & S2 & S3>(s1, s2, s3, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number, d: number}>;
+
+        result = _(obj).chain().extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4);
+        result = _(obj).chain().extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4, customizer);
+        result = _(obj).chain().extend<S1, S2, S3, S4, Obj & S1 & S2 & S3 & S4>(s1, s2, s3, s4, customizer, any);
+    }
+
+    {
+        let result: _.LoDashExplicitObjectWrapper<{a: number, b: number, c: number, d: number, e: number}>;
+
+        result = _(obj).chain().extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5);
+        result = _(obj).chain().extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5, customizer);
+        result = _(obj).chain().extend<Obj & S1 & S2 & S3 & S4 & S5>(s1, s2, s3, s4, s5, customizer, any);
+    }
+}
+
 // _.findKey
 module TestFindKey {
     let result: string;
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 359cc0fb9..05c3f43b9 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -8922,195 +8922,191 @@ declare module _ {
      **********/
 
     //_.assign
+    interface AssignCustomizer {
+        (objectValue: any, sourceValue: any, key?: string, object?: {}, source?: {}): any;
+    }
+
     interface LoDashStatic {
         /**
-        * Assigns own enumerable properties of source object(s) to the destination object. Subsequent
-        * sources will overwrite property assignments of previous sources. If a callback is provided
-        * it will be executed to produce the assigned values. The callback is bound to thisArg and
-        * invoked with two arguments; (objectValue, sourceValue).
-        * @param object The destination object.
-        * @param s1-8 The source object(s)
-        * @param callback The function to customize merging properties.
-        * @param thisArg The this binding of callback.
-        * @return The destination object.
-        **/
-        assign<P, T, S1, Value, Result>(
-            object: T,
-            s1: S1,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * Assigns own enumerable properties of source object(s) to the destination object. Subsequent sources
+         * overwrite property assignments of previous sources. If customizer is provided it’s invoked to produce the
+         * assigned values. The customizer is bound to thisArg and invoked with five arguments:
+         * (objectValue, sourceValue, key, object, source).
+         *
+         * Note: This method mutates object and is based on Object.assign.
+         *
+         * @alias _.extend
+         *
+         * @param object The destination object.
+         * @param source The source objects.
+         * @param customizer The function to customize assigned values.
+         * @param thisArg The this binding of callback.
+         * @return The destination object.
+         */
+        assign<TObject extends {}, TSource extends {}, TResult extends {}>(
+            object: TObject,
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
 
         /**
-        * @see _.assign
-        **/
-        assign<P, T, S1, S2, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * @see assign
+         */
+        assign<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            object: TObject,
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
 
         /**
-        * @see _.assign
-        **/
-        assign<P, T, S1, S2, S3, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * @see assign
+         */
+        assign<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            object: TObject,
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
 
         /**
-        * @see _.assign
-        **/
-        assign<P, T, S1, S2, S3, S4, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * @see assign
+         */
+        assign<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {},
+            TResult extends {}>
+        (
+            object: TObject,
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            source4: TSource4,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
 
         /**
-        * @see _.assign
-        **/
-        extend<P, T, S1, Value, Result>(
-            object: T,
-            s1: S1,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * @see _.assign
+         */
+        assign<TObject extends {}>(object: TObject): TObject;
 
         /**
-        * @see _.assign
-        **/
-        extend<P, T, S1, S2, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
-
-        /**
-        * @see _.assign
-        **/
-        extend<P, T, S1, S2, S3, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
-
-        /**
-        * @see _.assign
-        **/
-        extend<P, T, S1, S2, S3, S4, Value, Result>(
-            object: T,
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): Result;
+         * @see _.assign
+         */
+        assign<TObject extends {}, TResult extends {}>(
+            object: TObject, ...otherArgs: any[]
+        ): TResult;
     }
 
     interface LoDashImplicitObjectWrapper<T> {
         /**
-        * @see _.assign
-        **/
-        assign<S1, Value, TResult>(
-            s1: S1,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
+         * @see _.assign
+         */
+        assign<TSource extends {}, TResult extends {}>(
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
 
         /**
-        * @see _.assign
-        **/
-        assign<S1, S2, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        assign<S1, S2, S3, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        assign<S1, S2, S3, S4, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        assign<S1, S2, S3, S4, S5, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            s5: S5,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
 
         /**
-        * @see _.assign
-        **/
-        extend<S1, Value, TResult>(
-            s1: S1,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
 
         /**
-        * @see _.assign
-        **/
-        extend<S1, S2, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        extend<S1, S2, S3, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        extend<S1, S2, S3, S4, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
-        /**
-        * @see _.assign
-        **/
-        extend<S1, S2, S3, S4, S5, Value, TResult>(
-            s1: S1,
-            s2: S2,
-            s3: S3,
-            s4: S4,
-            s5: S5,
-            callback?: (objectValue: Value, sourceValue: Value) => Value,
-            thisArg?: any): TResult;
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            source4: TSource4,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
 
+        /**
+         * @see _.assign
+         */
+        assign(): LoDashImplicitObjectWrapper<T>;
+
+        /**
+         * @see _.assign
+         */
+        assign<TResult extends {}>(...otherArgs: any[]): LoDashImplicitObjectWrapper<TResult>;
+    }
+
+    interface LoDashExplicitObjectWrapper<T> {
+        /**
+         * @see _.assign
+         */
+        assign<TSource extends {}, TResult extends {}>(
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        assign<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            source4: TSource4,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.assign
+         */
+        assign(): LoDashExplicitObjectWrapper<T>;
+
+        /**
+         * @see _.assign
+         */
+        assign<TResult extends {}>(...otherArgs: any[]): LoDashExplicitObjectWrapper<TResult>;
     }
 
     //_.create
@@ -9174,6 +9170,177 @@ declare module _ {
         defaultsDeep<TResult>(...sources: any[]): LoDashImplicitObjectWrapper<TResult>
     }
 
+    //_.extend
+    interface LoDashStatic {
+        /**
+         * @see assign
+         */
+        extend<TObject extends {}, TSource extends {}, TResult extends {}>(
+            object: TObject,
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
+
+        /**
+         * @see assign
+         */
+        extend<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            object: TObject,
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
+
+        /**
+         * @see assign
+         */
+        extend<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            object: TObject,
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): TResult;
+
+        /**
+         * @see assign
+         */
+        extend<TObject extends {}, TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {},
+            TResult extends {}>
+            (
+                object: TObject,
+                source1: TSource1,
+                source2: TSource2,
+                source3: TSource3,
+                source4: TSource4,
+                customizer?: AssignCustomizer,
+                thisArg?: any
+            ): TResult;
+
+        /**
+         * @see _.assign
+         */
+        extend<TObject extends {}>(object: TObject): TObject;
+
+        /**
+         * @see _.assign
+         */
+        extend<TObject extends {}, TResult extends {}>(
+            object: TObject, ...otherArgs: any[]
+        ): TResult;
+    }
+
+    interface LoDashImplicitObjectWrapper<T> {
+        /**
+         * @see _.assign
+         */
+        extend<TSource extends {}, TResult extends {}>(
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            source4: TSource4,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashImplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.assign
+         */
+        extend(): LoDashImplicitObjectWrapper<T>;
+
+        /**
+         * @see _.assign
+         */
+        extend<TResult extends {}>(...otherArgs: any[]): LoDashImplicitObjectWrapper<TResult>;
+    }
+
+    interface LoDashExplicitObjectWrapper<T> {
+        /**
+         * @see _.assign
+         */
+        extend<TSource extends {}, TResult extends {}>(
+            source: TSource,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see assign
+         */
+        extend<TSource1 extends {}, TSource2 extends {}, TSource3 extends {}, TSource4 extends {}, TResult extends {}>(
+            source1: TSource1,
+            source2: TSource2,
+            source3: TSource3,
+            source4: TSource4,
+            customizer?: AssignCustomizer,
+            thisArg?: any
+        ): LoDashExplicitObjectWrapper<TResult>;
+
+        /**
+         * @see _.assign
+         */
+        extend(): LoDashExplicitObjectWrapper<T>;
+
+        /**
+         * @see _.assign
+         */
+        extend<TResult extends {}>(...otherArgs: any[]): LoDashExplicitObjectWrapper<TResult>;
+    }
+
     //_.findKey
     interface LoDashStatic {
         /**