Error Event and Promise Rejection Monitor via Saga and saga-event-observer

errorObserver.js

import { call } from 'redux-saga/effects'

import eventObserverSaga from 'saga-event-observer'

/*
handlers looks something like this:
this.eventHandlers = {
  onEvent:  [ this, this.handleEvent  ],
  onError:  [ this, this.handleError  ],
  onCancel: [ this, this.handleCancel ],
}
*/

export default function* startKeypressMonitor(config, handlers) {
  if ( ! config.monitor.errors ) { return }
  yield call(
    eventObserverSaga,
    'errors-observer',
    [ 'error' ],
    handlers
  )
  yield call(
    eventObserverSaga,
    'promise-rejection-observer',
    [ 'unhandledrejection' ],
    handlers
  )
}