You Provided `undefined` Where A Stream Was Expected In Redux Observable

Trying to wrap my head around RxJS and redux observable I have this: export const getSomeData = (action$) => action$.pipe( ofType(GET_USER_DATA), mergeMap((

Solution 1:

mergeMap should return an observable

mergeMap((data) => {
            const newData = data.somethingelse
            return of(fetchUserFulfilled(newData), anotherOne(newData))
        }),