Allowed functions in jest's describe

As of 22.0.5, jest allows classes for describe blocks.

types/jest/index.d.ts

@@ -220,7 +220,7 @@ declare namespace jest {
     }
 
     interface Describe {
-        (name: string, fn: EmptyFunction): void;
+        (name: string | Function, fn: EmptyFunction): void;
         only: Describe;
         skip: Describe;
     }

types/jest/jest-tests.ts

@@ -10,6 +10,10 @@ declare const $: any;
 // Tests based on the Jest website
 jest.unmock('../sum');
 
+class TestClass { }
+
+describe(TestClass, () => { });
+
 describe('sum', () => {
     it('adds 1 + 2 to equal 3', () => {
         const sum: (a: number, b: number) => number = require('../sum');