puppeteer/new-docs/puppeteer.eventemitter.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [EventEmitter](./puppeteer.eventemitter.md)

## EventEmitter class

The EventEmitter class that many Puppeteer classes extend.

<b>Signature:</b>

```typescript
export declare class EventEmitter implements CommonEventEmitter 
```
<b>Implements:</b> CommonEventEmitter

## Remarks

This allows you to listen to events that Puppeteer classes fire and act accordingly. Therefore you'll mostly use [on](./puppeteer.eventemitter.on.md) and [off](./puppeteer.eventemitter.off.md) 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)](./puppeteer.eventemitter.addlistener.md) |  | Add an event listener. |
|  [emit(event, eventData)](./puppeteer.eventemitter.emit.md) |  | Emit an event and call any associated listeners. |
|  [listenerCount(event)](./puppeteer.eventemitter.listenercount.md) |  | Gets the number of listeners for a given event. |
|  [off(event, handler)](./puppeteer.eventemitter.off.md) |  | Remove an event listener from firing. |
|  [on(event, handler)](./puppeteer.eventemitter.on.md) |  | Bind an event listener to fire when an event occurs. |
|  [once(event, handler)](./puppeteer.eventemitter.once.md) |  | Like <code>on</code> but the listener will only be fired once and then it will be removed. |
|  [removeAllListeners(event)](./puppeteer.eventemitter.removealllisteners.md) |  | Removes all listeners. If given an event argument, it will remove only listeners for that event. |
|  [removeListener(event, handler)](./puppeteer.eventemitter.removelistener.md) |  | Remove an event listener. |