Doesn't support vitest workspaces

[lishaduck]

Describe the bug

When trying to use @sveltejs/kit in a monorepo that uses Vitest workspaces, SvelteKit fails to resolve its peer dependency @sveltejs/vite-plugin-svelte.

Reproduction

https://github.com/lishaduck/svk-vitest-repro

Run pnpm i && pnpm vitest (from root)

Logs

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Startup Error ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
Error: Could not resolve peer dependency "@sveltejs/vite-plugin-svelte" relative to your project — please install it and try again.
    at resolve_peer_dependency (file:///Users/dukese01/Developer/psdtools.github.io/node_modules/.pnpm/@sveltejs+kit@2.15.3_@sveltejs+vite-plugin-svelte@5.0.3_svelte@5.18.0_vite@6.0.7_@types_68510af3441b04c6bc21b13c7b195734/node_modules/@sveltejs/kit/src/utils/import.js:16:9)
    at sveltekit (file:///Users/dukese01/Developer/psdtools.github.io/node_modules/.pnpm/@sveltejs+kit@2.15.3_@sveltejs+vite-plugin-svelte@5.0.3_svelte@5.18.0_vite@6.0.7_@types_68510af3441b04c6bc21b13c7b195734/node_modules/@sveltejs/kit/src/exports/vite/index.js:157:27)

System Info

System:
    OS: macOS 14.7.2
    CPU: (8) arm64 Apple M1
    Memory: 104.83 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 23.6.0 - /opt/homebrew/bin/node
    npm: 10.9.2 - /opt/homebrew/bin/npm
    pnpm: 10.0.0 - ~/.nvm/versions/node/v22.10.0/bin/pnpm
    Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 132.0.6834.84
    Safari: 18.2
  npmPackages:
    @sveltejs/adapter-static: ^3.0.8 => 3.0.8 
    @sveltejs/kit: ^2.0.0 => 2.15.3 
    @sveltejs/vite-plugin-svelte: ^5.0.3 => 5.0.3 
    svelte: ^5.0.0 => 5.18.0 
    vite: ^6.0.7 => 6.0.7

Severity

serious, but I can work around it

Additional Information

By "work around it", I mean, I can skip tests.

Originally found in a Vite 6 + Vitest 3 project, but the repro is Vite 5 + Vitest 3. Haven't tried Vitest 2 (because I'm using the new way of configuring workspaces in Vitest 3)

I use pnpm.

[eltigerchino]

I've created a PR to fix the peer dependency resolution but #11356 is still an issue