export function ofTypeAndPayload<T extends Action, R>(
  action: string
): OperatorFunction<T, R> {
  return pipe(
    ofType(action),
    map(Rprop('payload'))
  );
}

export function withLatestAndFilter<T extends Action, R>(
  selector: MemoizedSelector<any, boolean>,
  store: Store<any>
): OperatorFunction<T, any> {
  return pipe(
    withLatestFrom(store.pipe(select(selector))),
    filter(([_, state]: [any, boolean]) => !state)
  );
}