Using data utility function breaks useLoaderData types

[asgeo1]

Reproduction

Type safety seems messed up when returning data utility function from action/loader.

export const loader = async ({ request }: LoaderFunctionArgs) => {
  ...
  return data(mapped, {
    headers: {
      'Cache-Control': 'max-age=900, s-maxage=900, stale-while-revalidate=31536000'
    }
  })
}

export const VideosListPage = () => {
  const data = useLoaderData<typeof loader>()
  console.log(data[0]?.title)
  ...
}

Basically if you return data() from loader/action, the type of const data = useLoaderData<typeof loader>() will incorrectly be of DataWithResponseInit.

The typescript LSP will suggest properties like .data etc are available, but they don't work as that's not actually what is returned.

Searching this repo, there are other similar issues, but they are marked as closed/fixed. Which doesn't make sense, as the issue is definitely not fixed.

• useLoaderData types broken if unstable_data is conditionally used #9826
• Single fetch typesafety when using unstable_data conditionally #9998

System Info

System:
    OS: macOS 15.2
    CPU: (10) arm64 Apple M1 Max
    Memory: 1.76 GB / 64.00 GB
    Shell: 3.7.1 - /opt/homebrew/bin/fish
  Binaries:
    Node: 22.11.0 - ~/.nodenv/versions/22.11.0/bin/node
    npm: 10.9.0 - ~/.nodenv/versions/22.11.0/bin/npm
    Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
  Browsers:
    Brave Browser: 130.1.71.121
    Chrome: 131.0.6778.140
    Edge: 131.0.2903.99
    Safari: 18.2
  npmPackages:
    @remix-run/dev: ^2.15.1 => 2.15.1
    @remix-run/eslint-config: ^2.15.1 => 2.15.1
    @remix-run/node: ^2.15.1 => 2.15.1
    @remix-run/react: ^2.15.1 => 2.15.1
    @remix-run/route-config: ^2.15.1 => 2.15.1
    @remix-run/serve: ^2.15.1 => 2.15.1
    vite: ^5.1.0 => 5.4.8

Used Package Manager

npm

Expected Behavior

Types should be returned correctly

Actual Behavior

Types returned incorrectly

[bravo-kernel]

Confirmed as not fixed when using remix 2.15.0 and v3 future flag for single fetch.

Solution is provided here #9826 (comment)