Example notifications middleware with saga

example.js

import { takeLatest } from 'redux-saga'
import { EVENT1, EVENT2, EVENTETC } from '../constants'
import { put } from 'redux-saga/effects'
import { addAlert } from '../actions/alerts'
import t from '../../i18n/helper'

function* dispatchAlert(action) {
  let message;

  try {
    message = t('alerts.'+action.type);
    yield put(addAlert({message}));
  } catch(e){
    if(e.name != 'SagaCancellationException') throw(e);
  }
}

//Check every action to see if we should dispatch an alert
export default function* alerts() {
  yield* takeLatest([
    EVENT1,
    EVENT2,
    EVENTETC
  ], dispatchAlert);
}