Function watch

watch<Payload>(
    hub: Hub,
    channel: ChannelRoute | ChannelRoute[],
    target: EventTarget,
    eventType: string,
    processor?: WatchProcessor<Payload>,
): () => void
Watch an event emitter and retransmit events to a channel.
Type Parameters
- Payload
  The type of the payload carried by the message(s) being published.
Parameters
- hub: Hub
  Hub to which watched events will be dispatched.
- channel: ChannelRoute | ChannelRoute[]
  The name of the channel(s) to dispatch to. Will create fully qualified routes if they do not already exist.
- target: EventTarget
  EventTarget to watch for events of eventType.
- eventType: string
  Type of event to watch for on target.
- Optionalprocessor: WatchProcessor<Payload>
  Callback to convert events from target into the appropriate payload for channel. Defaults to simply returning the entire event object.
Returns () => void
Example
```
const hub = new Hub();

watch(hub, 'sandwiches', window, 'sandwich');

hub.sub('sandwiches', (p) => console.log(`received: ${p.detail}`));
window.dispatchEvent(new CustomEvent('sandwich', {detail: 'reuben'}));
// "received: reuben"
```
- Defined in work/denden/denden/src/extensions/watch.ts:30