tailwindcss

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Postcss: Run plugin in Once hook (#15273 )

Closes #15138

This PR changes the postcss client to run in the `Once` hook instead of
`OnceExit`. This makes sure the postcss order in v4 matches that of v3.

Conceptually this also makes more sense, since we expect tailwindcss to
be run as one of the first plugins in the pipeline (where `OnceExit`
would run it almost at the end).

To make sure it's still possible to use `postcss-import` before and have
it resolve to the right paths, we also needed to change the
`postcss-fix-relative-paths` plugin to run in the `Once` order
(`postcss-import` also uses `Once` order so the order).

## Test Plan

This issue had many ways in which it can manifest. I added a unit test
to ensure the plugin order works but here's a concrete example when
using the postcss plugin in Vite.

### Before

Image `url()`s were not properly handled since the postcss plugin to
transform these was run before Tailwind CSS could generate the class for
it:

<img width="2532" alt="Screenshot 2024-12-02 at 14 55 42"
src="https://github.com/user-attachments/assets/2f23b409-1576-441d-9ffe-6f24ad6e7436">

### After

<img width="2529" alt="Screenshot 2024-12-02 at 14 53 52"
src="https://github.com/user-attachments/assets/b754c3d8-1af1-4aeb-87da-0bfc3ffecdb7">

---------

Co-authored-by: Jordan Pittman <jordan@cryptica.me>

2024-12-03 10:28:51 +01:00

src

Postcss: Run plugin in Once hook (#15273 )

2024-12-03 10:28:51 +01:00

package.json

Prepare v4.0.0-beta.4 (#15245 )

2024-11-29 17:18:42 +01:00

README.md

Copy README file to every package (#13096 )

2024-03-06 08:49:31 -05:00

tsconfig.json

introduce v4 codebase