Function epic

test/createEpicMiddleware-spec.ts:46–50

(action$, _state$)

    spySandbox.spy(console, 'warn');
    const reducer: Reducer = (state = [], action) => state.concat(action);
    const epic: Epic = (action$, _state$) => action$.pipe(
      ofType('PING'),
      map(() => ({ type: 'PONG' })),
      ignoreElements(),
    );

    const middleware = createEpicMiddleware();
    createStore(reducer, applyMiddleware(middleware));