puppeteer/website/versioned_docs/version-20.5.0/api/puppeteer.commoneventemitter.on.md
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---
sidebar_label: CommonEventEmitter.on
---
# CommonEventEmitter.on() method
#### Signature:
```typescript
interface CommonEventEmitter {
on(event: EventType, handler: Handler): this;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | ------------------------------------- | ----------- |
| event | [EventType](./puppeteer.eventtype.md) | |
| handler | [Handler](./puppeteer.handler.md) | |
**Returns:**
this