Function event

event<TEventArgs>(targetOrQuery, name, initialValue, options?): ReactiveInitial<TEventArgs> & Reactive<TEventArgs>
Subscribes to an event, emitting data
Type Parameters
- TEventArgs extends Record<string, any>
Parameters
- targetOrQuery: null | string | EventTarget
  Event emitter, HTML element or string. If a string, it will be queryed as a selector.
- name: string
  Event name
- initialValue: undefined | TEventArgs
- options: Partial<EventOptions> = {}
  Options
Returns ReactiveInitial<TEventArgs> & Reactive<TEventArgs>
Example: Print x,y position of mouse as it moves
```
const r = Rx.From.event(document, `pointermove`);
r.onValue(event => {
 const { x, y } = event;
});
```
If options.lazy is true (default: false), event will only be subscribed to when the stream itself has a subscriber.

options.debugFiring and options.debugLifecycle can be turned on to troubleshoot behaviour of the stream if necessary.