redux-observable - dispatch multiple redux actions in a single epic (http://stackoverflow.com/questions/40886655/redux-observable-dispatch-multiple-redux-actions-in-a-single-epic)

redux-observable-dispatch-multiple-redux-actions-in-a-single-epic.js

There is no requirement that you make a one-to-one in/out ratio. So you can emit multiple actions using flatMap if you need to:

const loaded = (results) => ({type: 'RESULTS_LOADED', results});
const otherAction = (results) => ({type: 'MY_OTHER_ACTION', results});

searchEpic = (action$) => 
    action$
    .ofType('SEARCH')
    .mergeMap(
        Observable
        .fromPromise(searchPromise)
        // Flattens this into two events on every search
        .flatMap((data) => ([loaded(results), otherAction(results)]))
    )
Note that any Rx operator that accepts an Observable also can accept a Promise, Array, or Iterable; consuming them as-if they were streams. So we could use Observable.of instead for the same effect:

.flatMap((data) => Observable.of(loaded(results), otherAction(results)))
Which one you use depends on your personal style preferences.

But it can't do something like

function* StartUpSaga(): Generator<IOEffect, void, any> {
  yield put(loadConfigAction.trigger());
  yield take(loadConfigAction.SUCCESS);
  yield put(loadCardFromFsAction.trigger());
}

in redux saga.

In redux-observable, you can only dispatch action at the end.

Ok, my fault. I ignored the fact that it is a stream.
We can do it like this: redux-observable/redux-observable#62 (comment)