Add withRouter HOC to next.js typedef

types/next/router.d.ts

@@ -32,5 +32,7 @@ export interface SingletonRouter {
     onRouteChangeError?(error: any, url: string): void;
 }
 
+export function withRouter<T extends {}>(Component: React.ComponentType<T & {router: SingletonRouter}>): React.ComponentType<T>;
+
 export const Singleton: SingletonRouter;
 export default Singleton;

types/next/test/next-router-tests.tsx

@@ -51,3 +51,5 @@ Router.replace('/route', '/asRoute', {shallow: false}).then((success: boolean) =
 Router.prefetch('/route').then(Component => {
   const element = (<Component />);
 });
+
+r.withRouter(props => <div />);