Upgrade tools fails to upgrade the TailwindCSS from v3 to v4.

[bhaveshxrawat]

Upon following the upgrade guide, and using the upgrade tool.

When ran this command, npx @tailwindcss/upgrade@next

this is the result.

≈ tailwindcss v4.0.0

│ Searching for CSS files in the current directory and its subdirectories… 

│ ↳ Linked `.\tailwind.config.js` to `.\src\index.css` 

│ Migrating JavaScript configuration files…

│ ↳ Could not load the configuration file: Can't resolve '././E:\WDP\react\moodloom\tailwind.config.js' in 
│   'C:\Users\ACER-E5\AppData\Local\npm-cache\_npx\0044b4041b3b52e1\node_modules\@tailwindcss\upgrade\dist'

Now, I checked the destination it is trying to resolve the tailwind.config.js file from, and the destination only has a file named, index.mjs.

I'm using Node v22, and npm v11

[murnifine]

same here

[Kaishiyoku]

Same here

[bxacosta]

It seems to be an issue specific to Windows OS. If you really want to proceed with the migration, I recommend cloning your project on a Linux-based system or using WSL (Windows Subsystem for Linux). Then, run the migration tool in that environment. This approach worked for me when using WSL.

[YannickWhorst]

Worked for me as well

[Kaishiyoku]

Worked for me, too.

[bhaveshxrawat]

Worked, thanks!

[sumittttpaul]

If you do not wish to use or are unable to utilize WSL (Windows Subsystem for Linux), then the final option is:
https://tailwindcss.com/docs/upgrade-guide#upgrading-manually