Use Partial types for Object.assign

Author: falsandtru

lib/lib.es2015.core.d.ts

@@ -296,36 +296,9 @@ interface ObjectConstructor {
       * Copy the values of all of the enumerable own properties from one or more source objects to a
       * target object. Returns the target object.
       * @param target The target object to copy to.
-      * @param source The source object from which to copy properties.
+      * @param sources The source objects from which to copy properties.
       */
-    assign<T, U>(target: T, source: U): T & U;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      */
-    assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      * @param source3 The third source object from which to copy properties.
-      */
-    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param sources One or more source objects from which to copy properties
-      */
-    assign(target: any, ...sources: any[]): any;
+    assign<T>(target: Partial<T>, ...sources: Partial<T>[]): T;
 
     /**
       * Returns an array of all symbol properties found directly on object o.

lib/lib.es6.d.ts

@@ -4474,36 +4474,9 @@ interface ObjectConstructor {
       * Copy the values of all of the enumerable own properties from one or more source objects to a
       * target object. Returns the target object.
       * @param target The target object to copy to.
-      * @param source The source object from which to copy properties.
+      * @param sources The source objects from which to copy properties.
       */
-    assign<T, U>(target: T, source: U): T & U;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      */
-    assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      * @param source3 The third source object from which to copy properties.
-      */
-    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param sources One or more source objects from which to copy properties
-      */
-    assign(target: any, ...sources: any[]): any;
+    assign<T>(target: Partial<T>, ...sources: Partial<T>[]): T;
 
     /**
       * Returns an array of all symbol properties found directly on object o.

src/lib/es2015.core.d.ts

@@ -276,36 +276,9 @@ interface ObjectConstructor {
       * Copy the values of all of the enumerable own properties from one or more source objects to a
       * target object. Returns the target object.
       * @param target The target object to copy to.
-      * @param source The source object from which to copy properties.
+      * @param sources The source objects from which to copy properties.
       */
-    assign<T, U>(target: T, source: U): T & U;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      */
-    assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param source1 The first source object from which to copy properties.
-      * @param source2 The second source object from which to copy properties.
-      * @param source3 The third source object from which to copy properties.
-      */
-    assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
-
-    /**
-      * Copy the values of all of the enumerable own properties from one or more source objects to a
-      * target object. Returns the target object.
-      * @param target The target object to copy to.
-      * @param sources One or more source objects from which to copy properties
-      */
-    assign(target: any, ...sources: any[]): any;
+    assign<T>(target: Partial<T>, ...sources: Partial<T>[]): T;
 
     /**
       * Returns an array of all symbol properties found directly on object o.