Function has

has<E extends keyof Events>(
    eventName: E,
    listener: Events[E],
    context?: any,
): boolean
Check if a listener is registered for a given event.
Type Parameters
- E extends keyof Events
Parameters
- eventName: E
  The event name.
- listener: Events[E]
  The listener function.
- Optionalcontext: any
  The context that was used when registering the listener.
Returns boolean
true if the listener is registered.
Example
```
if (me.event.has("event-name", myFunction)) {
    // listener is registered
}
```
- Defined in packages/melonjs/src/system/event.ts:466