Parameters for the root path?

[jaens]

Is it possible to add a common path prefix to every route with file-based routing?

eg. in a multi-tenant / multi-login app, every path starts with eg. /user/12345/project/12345.

As far as I see, this can currently be achieved by nesting every file under /user/$userId/project/$projectId or adding that as a prefix to every source file, both options have fairly... terrible ergonomics (eg. due to making unreadable imports in IDEs and command line paths).

[jaens]

Another related question would then be - how to specify <Link> components without having to repeat the initial prefix part everywhere. I guess every link would have to be relative? That, I think, prevents extracting common React components containing <Link>s since those could be instantiated at different levels in the path tree...

Every such link could theoretically be generated with a hook that uses eg. useMatches() to copy the first segments of the path, but can this approach support type safety?