puppeteer/website/versioned_docs/version-10.0.0/puppeteer.commoneventemitter.once.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [CommonEventEmitter](./puppeteer.commoneventemitter.md) &gt; [once](./puppeteer.commoneventemitter.once.md)

## CommonEventEmitter.once() method

<b>Signature:</b>

```typescript
once(event: EventType, handler: Handler): CommonEventEmitter;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  event | [EventType](./puppeteer.eventtype.md) |  |
|  handler | [Handler](./puppeteer.handler.md) |  |

<b>Returns:</b>

[CommonEventEmitter](./puppeteer.commoneventemitter.md)