Handler for disconnect event type

ws-handler6.ts

if (eventType === 'DISCONNECT') {
  // Get all subscribers
  const subscriptions = mapper.query(Subscription, {
    connectionId: equals(connectionId)
  });
  // Remove subscriptions
  for await (const subscription of subscriptions) {
    const sub = Object.assign(new Subscription(), {
      id: `${connectionId}|${subscription.subscription.id}`
    });
    await mapper.delete(sub);
  }
  // Remove connection
  const connection = Object.assign(new Connection(), { id: connectionId });
  await mapper.delete(connection);

  return {
    statusCode: 200,
    body: ''
  };
}