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Emitter.once() method

Like .on() but will only fire once

Signature:

once<EventName extends keyof Events>(eventName: EventName, handler: (event: Events[EventName], context: Context) => void): () => void;

Parameters

Parameter	Type	Description
eventName	EventName
handler	(event: Events[EventName], context: Context) => void

Returns:

() => void

a function to unbind the handler