underscore - add typing to pick (#35977)

* add typing to underscore pick

* add typing to underscore pick

* add typing to underscore pick

* add typing to underscore pick

types/underscore/index.d.ts

@@ -6,6 +6,7 @@
 //                 Ard Timmerman <https://github.com/confususs>,
 //                 Julian Gonggrijp <https://github.com/jgonggrijp>,
 //                 Florian Keller <https://github.com/ffflorian>
+//                 Regev Brody <https://github.com/regevbr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -3710,9 +3711,9 @@ declare module _ {
         * @keys The key/value pairs to keep on `object`.
         * @return Copy of `object` with only the `keys` properties.
         **/
-        pick(
-            object: any,
-            ...keys: any[]): any;
+        pick<T, K extends keyof T>(obj: T, ...keys: K[]): Pick<T, K>;
+        pick<T, K extends keyof T>(obj: T, keys: K[]): Pick<T, K>;
+        pick<T, K extends keyof T>(obj: T, predicate: ObjectIterator<T[K], boolean>): Pick<T, K>;
 
         /**
         * @see _.pick

types/underscore/underscore-tests.ts

@@ -340,7 +340,13 @@ _.functions(_);
 _.extend({ name: 'moe' }, { age: 50 });
 _.extendOwn({ name: 'moe'}, { age: 50 });
 _.assign({ name: 'moe'}, { age: 50 });
-_.pick({ name: 'moe', age: 50, userid: 'moe1' }, 'name', 'age');
+
+_.pick({ name: 'moe', age: 50, userid: 'moe1' }, 'name', 'age').age = 5;
+_.pick({ name: 'moe', age: 50, userid: 'moe1' }, ['name', 'age']).age = 5;
+_.pick({ name: 'moe', age: 50, userid: 'moe1' }, (value, key) => {
+    return key === 'name' || key === 'age';
+}).age = 5;
+
 _.omit({ name: 'moe', age: 50, userid: 'moe1' }, 'name');
 _.omit({ name: 'moe', age: 50, userid: 'moe1' }, 'name', 'age');
 _.omit({ name: 'moe', age: 50, userid: 'moe1' }, ['name', 'age']);