delay-between-retries.js

pendingItems
  .map(item => Rx.Observable.of(item).delay(item.sync.counter > 0 ? delayBetweenRetries : 0))
  .mergeAll()
  .subscribe((itemWithMetaData) => {
  api.syncEvent(itemWithMetaData.item)
  .then((result) => {
    console.log('successfully synced a mouse event');
  })
  .catch((reason) => {
    console.error('got an error while trying to sync an event, going to try again');
    queue(itemWithMetaData);
  });
});