Type error on `toFetchHandler` when implementing Express

[alpheusmtx]

Environment

Package manager: pnpm v10.24.0
Node.js version: v24.11.1

Reproduction

https://github.com/alpheusmtx/srvx-express-type-error

Describe the bug

When putting the express app variable into toFetchHandler, even it is working in JS, but type error show up.

const ex = express();

const fetchHandler = toFetchHandler(ex);

Additional context

No response

Logs