How to retrieve type of serverFn's returned data?

I've defined a serverFn like so:

const fetchDataFn = createServerFn({ method: "GET" }).handler(
  async () => { return fetchDataFromDB() }
);

const fetchDataFn = createServerFn({ method: "GET" }).handler(
  async () => { return fetchDataFromDB() }
);

const fetchDataFn = createServerFn({ method: "GET" }).handler(
  async () => { return fetchDataFromDB() }
);

const fetchDataFn = createServerFn({ method: "GET" }).handler(
  async () => { return fetchDataFromDB() }
);

In earlier TanStack versions I was able to do:

type FetchedData = Awaited<ReturnType<typeof fetchDataFn>>

type FetchedData = Awaited<ReturnType<typeof fetchDataFn>>

type FetchedData = Awaited<ReturnType<typeof fetchDataFn>>

type FetchedData = Awaited<ReturnType<typeof fetchDataFn>>

and this worked fine e.g

FetchedData

FetchedData

FetchedData

FetchedData was just

{ message: string }

{ message: string }

{ message: string }

{ message: string } or whatever;

But now,

FetchedData

FetchedData

FetchedData

FetchedData is a more complex type:

{ message: string } | FullFetcherData<undefined, { message: string }>;

{ message: string } | FullFetcherData<undefined, { message: string }>;

{ message: string } | FullFetcherData<undefined, { message: string }>;

{ message: string } | FullFetcherData<undefined, { message: string }>;
Is there maybe a type helper I should be using here?