interface Foo {
  Promise<ResponsePromise<sequence<DOMString?>>> bar();
};

// Extracted from https://w3c.github.io/ServiceWorker/ on 2014-05-08

interface ServiceWorkerClients {
  Promise<Client[]?> getServiced();
  Promise<any> reloadAll();
};

// Extracted from https://w3c.github.io/ServiceWorker/ on 2014-05-13

interface FetchEvent : Event {
  ResponsePromise<any> default();
};