puppeteer/docs/api/puppeteer.eventemitter.once.md

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---
sidebar_label: EventEmitter.once
---
# EventEmitter.once() method
Like `on` but the listener will only be fired once and then it will be removed.
#### Signature:
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```typescript
class EventEmitter {
once(event: EventType, handler: Handler<any>): this;
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}
```
## Parameters
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| Parameter | Type | Description |
| --------- | -------------------------------------------- | ------------------------------------------------- |
| event | [EventType](./puppeteer.eventtype.md) | the event you'd like to listen to |
| handler | [Handler](./puppeteer.handler.md)&lt;any&gt; | the handler function to run when the event occurs |
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**Returns:**
this
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`this` to enable you to chain method calls.