Single Fetch: Readonly arrays are not accepted as valid serialisable data in loader

[artursvonda]

Reproduction

https://stackblitz.com/edit/remix-run-remix-a4chia?file=app%2Froutes%2F_index.tsx

System Info

System:
    OS: macOS 14.4.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 76.98 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 21.6.1 - ~/.nvm/versions/node/v21.6.1/bin/node
    npm: 10.2.4 - ~/.nvm/versions/node/v21.6.1/bin/npm
  Browsers:
    Chrome: 124.0.6367.119
    Safari: 17.4.1

Used Package Manager

npm

Expected Behavior

Types are correctly inferred

Actual Behavior

Loader data is inferred as never

[artursvonda]

The solution should be just to add ReadonlyArray and other readonly types to Serializable type.

[brophdawg11]

I think this is resolved by #9372 - we should have an prerelease out shortly to confirm.

[brophdawg11]

This fix is available in 2.9.2-pre.1 if you'd like to give it a shot and see if it resolves your issue! Here's the draft release notes: https://github.com/remix-run/remix/blob/release-next/CHANGELOG.md#v292

[brophdawg11]

2.9.2 is released - https://github.com/remix-run/remix/releases/tag/remix%402.9.2