puppeteer/website/versioned_docs/version-19.3.0/api/puppeteer.eventemitter.md
release-please[bot] c4803e4a37
chore: release main (#9313)
🤖 I have created a release *beep* *boop*
---


<details><summary>ng-schematics: 0.1.0</summary>

## 0.1.0 (2022-11-23)


### Features

* **ng-schematics:** Release @puppeteer/ng-schematics
([#9244](https://github.com/puppeteer/puppeteer/issues/9244))
([be33929](be33929770))
</details>

<details><summary>puppeteer: 19.3.0</summary>

##
[19.3.0](https://github.com/puppeteer/puppeteer/compare/puppeteer-v19.2.2...puppeteer-v19.3.0)
(2022-11-23)


### Miscellaneous Chores

* **puppeteer:** Synchronize puppeteer versions


### Dependencies

* The following workspace dependencies were updated
  * dependencies
    * puppeteer-core bumped from 19.2.2 to 19.3.0
</details>

<details><summary>puppeteer-core: 19.3.0</summary>

##
[19.3.0](https://github.com/puppeteer/puppeteer/compare/puppeteer-core-v19.2.2...puppeteer-core-v19.3.0)
(2022-11-23)


### Features

* **puppeteer-core:** Infer element type from complex selector
([#9253](https://github.com/puppeteer/puppeteer/issues/9253))
([bef1061](bef1061c06))
* **puppeteer-core:** update Chrome launcher flags
([#9239](https://github.com/puppeteer/puppeteer/issues/9239))
([ae87bfc](ae87bfc2b4))


### Bug Fixes

* remove boundary conditions for visibility
([#9249](https://github.com/puppeteer/puppeteer/issues/9249))
([e003513](e003513c0c))
</details>

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
2022-11-23 14:14:25 +01:00

2.6 KiB

sidebar_label
EventEmitter

EventEmitter class

The EventEmitter class that many Puppeteer classes extend.

Signature:

export declare class EventEmitter implements CommonEventEmitter

Implements: CommonEventEmitter

Remarks

This allows you to listen to events that Puppeteer classes fire and act accordingly. Therefore you'll mostly use on and off to bind and unbind to event listeners.

The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the EventEmitter class.

Methods

Method Modifiers Description
addListener(event, handler) Add an event listener.
emit(event, eventData) Emit an event and call any associated listeners.
listenerCount(event) Gets the number of listeners for a given event.
off(event, handler) Remove an event listener from firing.
on(event, handler) Bind an event listener to fire when an event occurs.
once(event, handler) Like on but the listener will only be fired once and then it will be removed.
removeAllListeners(event) Removes all listeners. If given an event argument, it will remove only listeners for that event.
removeListener(event, handler) Remove an event listener.