Redux-observable epic with polling.

gamesEpic.js

const loadGames = (action$, store, scheduler, timeout = 1000 * 30, debounce = 350) =>
  action$
    .ofType('LOAD_GAMES')
    .debounceTime(debounce, scheduler)
    .switchMap(({ payload: { date } }) =>
      of({
        type: 'SET_GAMES_LOADING', payload: { date },
      })
        .merge(ajax({
          url: `${url}date/${date}`,
          responseType: 'json',
        })
          .map(({ response }) => ({
            type: 'RECEIVE_GAMES', payload: { date, items: response },
          }))
          .repeatWhen(o => o.concatMap(() => timer(timeout, timeout, scheduler)))
          .retryWhen(e => e.delay(timeout, scheduler))
          .takeUntil(action$.ofType('LOAD_GAMES_CANCEL'))))