Yarn warning about workspaces

[ledermann]

Describe the bug

Since release 1.2.0 I got this warning while installing packages with Yarn:

warning Workspaces can only be enabled in private projects.

In context:

yarn install v1.22.19
[1/5] 🔍  Resolving packages...
[2/5] 🚚  Fetching packages...
[3/5] 🔗  Linking dependencies...
warning Workspaces can only be enabled in private projects.
[4/5] 🔨  Building fresh packages...
[5/5] ♻️  Cleaning modules...
✨  Done in 2.41s.

After reverting to 1.1.1 it is fine again:

yarn install v1.22.19
[1/5] 🔍  Resolving packages...
[2/5] 🚚  Fetching packages...
[3/5] 🔗  Linking dependencies...
[4/5] 🔨  Building fresh packages...
[5/5] ♻️  Cleaning modules...
✨  Done in 2.28s.

Reproduction URL

https://stackblitz.com/edit/vitejs-vite-xpgczc

Reproduction

1. Open new terminal in StackBlitz
2. Run yarn check
3. See the warning

Logs

No response

System Info

System:
    OS: macOS 13.0.1
    CPU: (20) arm64 Apple M1 Ultra
    Memory: 21.37 GB / 64.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 19.1.0 - /opt/homebrew/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 8.19.3 - /opt/homebrew/bin/npm
  Browsers:
    Brave Browser: 107.1.45.127
    Chrome: 107.0.5304.110
    Firefox: 107.0
    Safari: 16.1
  npmPackages:
    @sveltejs/vite-plugin-svelte: ^1.3.0 => 1.3.0
    svelte: ^3.53.1 => 3.53.1
    vite: ^3.2.4 => 3.2.4

[bluwy]

Looks like yarnpkg/yarn#8580 happening for the new vitefu dep we added in 1.2.0. Not sure why yarn validates that for third-party packages, but I could fix this upstream nonetheless.

[ledermann]

With vitefu 0.2.2 the warning is gone, thanks!