puppeteer/website/versioned_docs/version-25.4.0/api/puppeteer.eventemitter.on.md

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EventEmitter.on

EventEmitter.on() method

Bind an event listener to fire when an event occurs.

Signature

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

Parameters

Parameter	Type	Description
type	Key	the event type you'd like to listen to. Can be a string or symbol.
handler	Handler<EventsWithWildcard<Events>[Key]>	the function to be called when the event occurs.

Returns:

this

this to enable you to chain method calls.