What version of Tailwind CSS are you using?

"@tailwindcss/vite": "^4.1.6","tailwindcss": "^4.1.6",

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

"@tanstack/react-start": "^1.120.4-alpha.6","vite": "^6.1.0"

What version of Node.js are you using?

v20.17.0

What browser are you using?

not relevant

What operating system are you using?

macOS

Reproduction URL

yjoer/basic-virtual-file-based@9f291d9

Describe your issue

vite tailwind plugin does not support the new vite environment API yet.
This caused the build to fail in TanStack Start which uses the vite environment:

[@tailwindcss/vite:generate:build] Cannot create proxy with a non-object as target or handlerfile: /basic-virtual-file-based/src/styles.css?transform-only

The reason for this build failure is that the fallback that vite uses when a plugin usescreateResolver requires the environment to be called'ssr' which in TanStack Start's case was not the case.

We renamed the server environment in TanStack Start tossr to ensure compatibliity:TanStack/router#4167

However, the tailwind vite plugin should eventually support the vite environment API by migrating tocreateIdResolver
seevitejs/vite#20031