Function onOnce

onOnce<T>(obj, eventName, listener): IHandle
Listens for an emitted event from an object and executes a callback only once before removing the listener.
Type Parameters
- T extends Evented
Parameters
- obj: T
  The object to listen to.
- eventName: EventNames<T>
  The name of the event to listen for.
- listener: EventedCallback<T["@eventTypes"][EventNames<T>]>
  The callback to execute once the event is emitted.
Returns IHandle