How whould you translate the following "epic" or "saga" to MobX? Just interested...

Redux-Observable Redux-Saga

//Epic
export default function searchUsers(action$) {
  return action$.ofType(ActionTypes.SEARCHED_USERS)
    .map(action => action.payload.query)
    .filter(q => !!q)
    .switchMap(q =>
      Observable.timer(800) // debounce
        .takeUntil(action$.ofType(ActionTypes.CLEARED_SEARCH_RESULTS))
        .mergeMap(() => Observable.merge(
          Observable.of(replace(`?q=${q}`)),
          ajax.getJSON(`https://api.github.com/search/users?q=${q}`)
            .map(res => res.items)
            .map(receiveUsers)
        ))
    );
};

//SAGA
function* watchAuth() {
  while(true) {
    try {
      const {name, password} = yield take(LOGIN_REQUEST)

      yield race([
        take(LOGOUT),
        call(authAndRefreshTokenOnExpiry, name, password)
      ])

      // user logged out, next while iteration will wait for the
      // next LOGIN_REQUEST action

    } catch(error) {
      yield put( login.error(error) )
    }
  }
}