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2c1dea4c1a
Closes #15220 This PR fixes an issue where the upgrade tool would not be able to load some JavaScript config files across different drive letters on Windows. The issue in detail is that `path.relative(…)` tries to build a relative path but if the file is inside the same folder, it won't start the relative path with a `./` so we manually appended it in case that it isn't there. The issue on Windows specifically is that `file.relative(…)` can also return a legit absolute path, e.g. when the file is on a different drive. In this case we obviously don't want to prefix a path with `./`. ## Test plan To reproduce this issue, I checked out a Tailwind v3 project _on a different drive letter than my Windows installation_. In that case, I was adding a repo inside `D:` while `npm` was installed in `C:`. I then run `npx @tailwindcss/upgrade` to reproduce the issue. The fix was validated with a local `bun` run of the upgrade tool: 