`read` cutting first character of path

[Torbet]

Describe the bug

when using import { read } from '$app/server';, the first character of the path gets cut off.

I have a map.pgm in src/lib/map.pgm (but same for any path), and calling read('src/lib/map.pgm) gives:

Error: Asset does not exist: rc/lib/map.pgm

fs.readFileSync works correctly.

Calling read('ssrc/lib/map.pgm) (adding extra s at the start) does not error.

Reproduction

Described above.

Logs

Error: Asset does not exist: rc/lib/map.pgm

System Info

System:
    OS: macOS 14.3.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 187.16 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 21.6.2 - /opt/homebrew/bin/node
    npm: 10.2.4 - /opt/homebrew/bin/npm
  Browsers:
    Safari: 17.3.1
  npmPackages:
    @sveltejs/adapter-node: ^4.0.1 => 4.0.1 
    @sveltejs/kit: ^2.0.0 => 2.5.0 
    @sveltejs/vite-plugin-svelte: ^3.0.0 => 3.0.2 
    svelte: ^4.2.7 => 4.2.10 
    vite: ^5.0.3 => 5.0.12

Severity

serious, but I can work around it

Additional Information

No response

[Conduitry]

This is not the correct way to be using read(), although it doesn't look like we're documenting this well currently, as far as I can tell.

read() should be passed the path generated by Vite upon importing an asset, not just a path to the file. Vite needs to know about the file so that it can be properly included in your production build at build-time. This is the problem read() was designed to solve. Just reading the file from src at runtime won't work, because it won't be there anymore in the built production app.