Postcss: Run plugin in Once hook
#15273
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| ### Fixed | ||
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| - Ensure other plugins can run after `@tailwindcss/postcss` ([#15273](https://github.com/tailwindlabs/tailwindcss/pull/15273)) | ||
| - Rebase `url()` inside imported CSS files when using Vite with the `@tailwindcss/postcss` extension ([#15273](https://github.com/tailwindlabs/tailwindcss/pull/15273)) |
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Do we have a test for this specifically?
thecrypticace
approved these changes
Dec 2, 2024
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Closes #15138
This PR changes the postcss client to run in the
Oncehook instead ofOnceExit. 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
OnceExitwould run it almost at the end).To make sure it's still possible to use
postcss-importbefore and have it resolve to the right paths, we also needed to change thepostcss-fix-relative-pathsplugin to run in theOnceorder (postcss-importalso usesOnceorder 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:After