a redux observable epic that controls and uses a webcam.

webcam-epic.ts

const initializeWebcamEpic = (actions$: ActionsObservable<StartWebcamAction>) =>
  actions$.pipe(
    ofType(WebcamActionTypes.START_WEBCAM),
    switchMap(({ payload }) => {
      let timerIntervalMultiple = 0;
      return initializeWebcam(payload.videoElement, payload.canvasElement).pipe(
        tap(_ => (timerIntervalMultiple += 1)),
        filter(_ => (timerIntervalMultiple * 40 > 200 ? true : false)),
        map(_ =>  payload.canvasElement.toDataURL('image/jpeg', 1.0)),
        map(jpeg => storeImage(jpeg))
      );
    })
  );