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Version: 22.7.1

EventEmitter.once() method

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

Signature:

class EventEmitter {
once<Key extends keyof EventsWithWildcard<Events>>(
type: Key,
handler: Handler<EventsWithWildcard<Events>[Key]>
): this;
}

Parameters

Parameter

Type

Description

type

Key

the event you'd like to listen to

handler

Handler<EventsWithWildcard<Events>[Key]>

the handler function to run when the event occurs

Returns:

this

this to enable you to chain method calls.