sidebar_label: EventEmitter.once

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](./puppeteer.handler.md)<[EventsWithWildcard](./puppeteer.eventswithwildcard.md)<Events>\[Key\]>	the handler function to run when the event occurs

Returns:

this

this to enable you to chain method calls.