wait-concurrent-task-queue.js

// the first to fire between "all done" and "cancel"
const { cancelDownload, allDone } = yield race({
  allDone: take(allDoneChannel),
  cancelDownload: take("CANCEL_DOWNLOAD")
});

// stop the queue manager
yield cancel(watcherTask);

// in case of cancellation just return;
if (cancelDownload){
  return;
}
// in case of "all done" create a  link and put a new action
if (allDone) {
  const link = URL.createObjectURL(blobBuilder.build());
  yield put(downloadFinished({ id, link }));
  return;
}