# Type Alias: UnsubscribeFn()

> 

> **UnsubscribeFn**: () => `void`

Defined in: [packages/server/src/observable/types.ts:7](https://github.com/trpc/trpc/blob/7c907acfd8b31929214792e3b8c2ad7a8ac72563/packages/server/src/observable/types.ts#L7)

Stops a subscription.

## Returns

`void`