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