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puppeteer/docs/api/puppeteer.eventemitter.once.md
jrandolf f07ad2c661
fix: update documentation on configuring puppeteer ()
This PR updates the docs regarding configuring puppeteer. In addition,
some changes have been made to the documentation generator to show
default values on the documentation site.

Also fixes: https://github.com/puppeteer/puppeteer/pull/9144
2022-10-24 09:07:05 +02:00

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813 B
Markdown

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