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EventEmitter.once() method

Like on but the listener will only be fired once and then it will be removed.

Signature:

once(event: EventType, handler: Handler): EventEmitter;

Parameters

Parameter	Type	Description
event	EventType	the event you'd like to listen to
handler	Handler	the handler function to run when the event occurs

Returns:

EventEmitter

this to enable you to chain method calls.