[v4] @tailwindcss/upgrade fails silently without error due to missing dependencies

[julian-scholz]

What version of Tailwind CSS are you using?

v4.0.5

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

Angular v19.1.5, PostCSS v8.5.1

What version of Node.js are you using?

v22.13.1

What browser are you using?

Chrome

What operating system are you using?

Ubuntu 20.04 (WSL)

Reproduction URL

N/A

Describe your issue

When migrating a v3 project, the migration tool did not produce any results when executed and did not change anything in the project files. However, no error message is displayed.

The reason why the migration fails only becomes clear when the @tailwindcss/upgrade package is manually installed (npm i).
In my case, the make utility was missing.

After installing the build essentials package for Ubuntu (which includes the make utility), the migration then also worked.
It would be good if this error message was also displayed when running with npx. Otherwise, the Tailwind migration documentation could indicate that the package should first be installed manually before running it with npx to simplify potential debugging scenarios.

[philipp-spiess]

Thanks! Improved our error reporting around this now. Thanks for the report. Should be out with the next patch release 👍