AppLoadContext in typegen files isn't correctly augmented when using NodeNext module resolution

[pawelblaszczyk5]

I'm using React Router as a...

framework

Reproduction

This was previously reported as a part of #12424 Since that one is already resolved I wanted to separate this part into its own issue, so it can be tracked.

Reproduction - I separated reproduction into separate commit

1. Go to app/routes/home.tsx
2. Observe mismatch between context from typegen file and context imported from react-router

System Info

Not applicable here, but here you go:

  System:
    OS: macOS 15.1.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 195.36 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.10.0 - ~/.local/state/fnm_multishells/18617_1736447107271/bin/node
    Yarn: 1.22.19 - ~/.local/state/fnm_multishells/18617_1736447107271/bin/yarn
    npm: 10.2.3 - ~/.local/state/fnm_multishells/18617_1736447107271/bin/npm
    pnpm: 8.15.8 - ~/.local/state/fnm_multishells/18617_1736447107271/bin/pnpm
    bun: 1.1.33 - ~/.bun/bin/bun
  Browsers:
    Chrome: 131.0.6778.205
    Edge: 120.0.2210.121
    Safari: 18.1.1
  npmPackages:
    @react-router/dev: ^7.1.1 => 7.1.1 
    @react-router/node: ^7.1.1 => 7.1.1 
    @react-router/serve: ^7.1.1 => 7.1.1 
    react-router: ^7.1.1 => 7.1.1 
    vite: ^5.4.11 => 5.4.11

Used Package Manager

pnpm

Expected Behavior

When I augment AppLoadContext types I expect them to work also in types coming from typegen files

Actual Behavior

There's a mismatch between AppLoadContext in type gen file and imported from react-router one:

[Mordred]

I'm also experiencing this issue. I solved it for now with explicit typing:

export const loader = ({ context }: Route.LoaderArgs & { context: AppLoadContext }) => {
  ...
}