EventEmitter.once() method

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

Signature

typescript

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

Parameters

Parameter

</th><th>

Type

</th><th>

Description

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type

</td><td>

Key

</td><td>

the event you'd like to listen to

</td></tr> <tr><td>

handler

</td><td>

Handler<EventsWithWildcard<Events>[Key]>

</td><td>

the handler function to run when the event occurs

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Returns:

this

this to enable you to chain method calls.