import { combineEpics } from 'redux-observable'; import 'rxjs';// used for example epic const rootEpic = combineEpics( ); // use this //export { rootEpic as default }; // delete example export default function exampleEpic(action$) { return action$.filter(x => x.type === 'PING') .mapTo({type: 'PONG'}); };