Fixing renderComponent

It should return a descriptor, not be void.

react/react.d.ts

@@ -10,7 +10,7 @@ declare module "react" {
 declare module React {
     export function createClass<P, S>(specification: Specification<P, S>): Factory<P>;
 
-    export function renderComponent(component: Descriptor<any>, container: Element, callback?: () => void): void;
+    export function renderComponent<P>(component: Descriptor<P>, container: Element, callback?: () => void): Descriptor<P>;
 
     export function unmountComponentAtNode(container: Element): boolean;