puppeteer/docs/api/puppeteer.commoneventemitter.once.md
2022-07-05 15:41:43 +02:00

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---
sidebar_label: CommonEventEmitter.once
---
# CommonEventEmitter.once() method
**Signature:**
```typescript
interface CommonEventEmitter {
once(event: EventType, handler: Handler): CommonEventEmitter;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | ------------------------------------- | ----------- |
| event | [EventType](./puppeteer.eventtype.md) | |
| handler | [Handler](./puppeteer.handler.md) | |
**Returns:**
[CommonEventEmitter](./puppeteer.commoneventemitter.md)