@tailwindcss/vite@4.0.6 is not compatible with vite@7.x.

[guotie]

Which project does this relate to?

Create Tanstack App

Describe the bug

4:40:47 PM [vite] (client) ✨ new dependencies optimized: @tanstack/ai-react, @tanstack/ai-client
4:40:47 PM [vite] (client) ✨ optimized dependencies changed. reloading
4:40:48 PM [vite] Internal server error: Cannot convert undefined or null to object
  Plugin: @tailwindcss/vite:generate:serve
  File: /Volumes/T9/product/2026/tokstudio/src/styles.css?direct
      at M.generate (file:///Volumes/T9/product/2026/tokstudio/node_modules/.pnpm/@tailwindcss+vite@4.0.6_vite@7.1.7/node_modules/@tailwindcss/vite/dist/index.mjs:1:5762)
      at async TransformPluginContext.transform (file:///Volumes/T9/product/2026/tokstudio/node_modules/.pnpm/@tailwindcss+vite@4.0.6_vite@7.1.7/node_modules/@tailwindcss/vite/dist/index.mjs:1:3431)
      at async EnvironmentPluginContainer.transform (file:///Volumes/T9/product/2026/tokstudio/node_modules/.pnpm/vite@7.1.7_@types+node@22.10.2_tsx@4.0.0/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:30984:14)
      at async loadAndTransform (file:///Volumes/T9/product/2026/tokstudio/node_modules/.pnpm/vite@7.1.7_@types+node@22.10.2_tsx@4.0.0/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:26116:26)
      at async viteTransformMiddleware (file:///Volumes/T9/product/2026/tokstudio/node_modules/.pnpm/vite@7.1.7_@types+node@22.10.2_tsx@4.0.0/node_modules/vite/dist/node/chunks/dep-Bm2ujbhY.js:27187:20)

Your Example Website or App

no url

Steps to Reproduce the Bug or Issue

1. npm create @tanstack/start@latest
2. npm run dev
3. error occurs

Expected behavior

As a user, I expect works well

Screenshots or Videos

No response

Platform

• OS: [macOS]
• Browser: [Chrome]
• Version: [143]

Additional context

I ask clause code opus, answer as following:
The issue is a version incompatibility: @tailwindcss/vite@4.0.6 is too old for vite@7.1.7. The @tailwindcss/vite plugin at version 4.0.6 was designed for Vite 5/6, and the internal API changes in Vite 7 cause the "Cannot convert undefined or null to object" error in the plugin's generate method.

After I upgrade @tailwindcss/vite to 4.1.18, it works.