> ## Documentation Index
> Fetch the complete documentation index at: https://colin-feat-client-cache-mode.mintlify.site/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/8976c37f79efa6b87809b884f29a1f235a8c4ad1/src/server/middleware.ts#L15)

## Type Parameters

### R

`R` = `unknown`

## Returns

`Promise`\<`R`>