puppeteer/website/versioned_docs/version-20.4.0/api/puppeteer.commoneventemitter.emit.md
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---
sidebar_label: CommonEventEmitter.emit
---
# CommonEventEmitter.emit() method
#### Signature:
```typescript
interface CommonEventEmitter {
emit(event: EventType, eventData?: unknown): boolean;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | ------------------------------------- | ------------ |
| event | [EventType](./puppeteer.eventtype.md) | |
| eventData | unknown | _(Optional)_ |
**Returns:**
boolean