Backend event stop

External events can call cancel(reason) without involving timer schedules.

Backend event stopLive

External event

Listening

idle

TransportWebSocket/SSE

Local stateidle

Actioncancel(reason)

useEffect(() => {
  return subscribeToAuction(auctionId, event => {
    if (event.type === 'auction:sold') timer.cancel('sold');
  });
}, [auctionId, timer.cancel]);