[Home](./index.md) > [puppeteer](./puppeteer.md) > [EventEmitter](./puppeteer.eventemitter.md) > [addListener](./puppeteer.eventemitter.addlistener.md) ## EventEmitter.addListener() method > Warning: This API is now obsolete. > > please use `on` instead. > Add an event listener. Signature: ```typescript addListener(event: EventType, handler: Handler): EventEmitter; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | event | EventType | | | handler | Handler | | Returns: [EventEmitter](./puppeteer.eventemitter.md)