[v4] 4.0.8 Vite plugin breaks if there are virtual imports like `unfonts.css`

[octoper]

What version of Tailwind CSS are you using?

For example: v4.0.8

What build tool (or framework if it abstracts the build tool) are you using?

For example: Vite v6.1.1

What version of Node.js are you using?

For example: v20.13.1

What browser are you using?

For example: Chrome

What operating system are you using?

For example: macOS

Reproduction URL

https://github.com/octoper/vitejs-tailwind408-repro

Describe your issue

When upgraded to @tailwindcss/vite to 4.0.8 I started seeing the error below, this seem to occur when I'm importing a virtual module unfonts.css coming from the https://github.com/cssninjaStudio/unplugin-fonts Vite plugin. Downgrading to 4.0.7 fixes the issue

node:internal/fs/promises:1028
  path = getValidatedPath(path);
         ^

TypeError [ERR_INVALID_ARG_VALUE]: The argument 'path' must be a string, Uint8Array, or URL without null bytes. Received '/Users/octoper/projects/vitejs-tailwind408-repro/\x00unfonts.css'
    at Object.stat (node:internal/fs/promises:1028:10)
    at C.addBuildDependency (file:///Users/octoper/projects/vitejs-tailwind408-repro/node_modules/@tailwindcss/vite/dist/index.mjs:1:5234)
    at C.generate (file:///Users/octoper/projects/vitejs-tailwind408-repro/node_modules/@tailwindcss/vite/dist/index.mjs:1:3810)
    at TransformPluginContext.transform (file:///Users/octoper/projects/vitejs-tailwind408-repro/node_modules/@tailwindcss/vite/dist/index.mjs:1:1967)
    at EnvironmentPluginContainer.transform (file:///Users/octoper/projects/vitejs-tailwind408-repro/node_modules/vite/dist/node/chunks/dep-Cg8OuIew.js:48466:19)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async loadAndTransform (file:///Users/octoper/projects/vitejs-tailwind408-repro/node_modules/vite/dist/node/chunks/dep-Cg8OuIew.js:42166:27) {
  code: 'ERR_INVALID_ARG_VALUE'
}

[philipp-spiess]

Hey! This is fixed now as of the latest patch release. Thanks for your report!