> ## Documentation Index
> Fetch the complete documentation index at: https://fastmcp-ts.docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Next

```ts theme={null}
type Next<R> = () => Promise<R>;
```

Defined in: [server/middleware.ts:15](https://github.com/PrefectHQ/fastmcp-ts/blob/e4b6038f642b529f601463a576229747afebe9a4/src/server/middleware.ts#L15)

## Type Parameters

### R

`R` = `unknown`

## Returns

`Promise`\<`R`>