Updating past 3.1.1 breaks postCSS plugins customisation. Fully debugged, just needs fixing about docusaurus

[slorber]

I understand the issue thanks for reporting.

Indeed, if a plugin add a loader that has a postcss config, that postcss config should also be configured.

The sass plugin uses our getStyleLoader function (using postcss under the hood) so yes this has to be modified by the configurePostCss to work:
https://github.com/rlamana/docusaurus-plugin-sass/blob/master/docusaurus-plugin-sass.js

I'll fix it in #10132

Note your 3.1.1 setup looks dependent on plugin ordering, I suspect using the sass plugin last would break it too.

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I took a look at your repro, but it's not clear exactly what I'm supposed to see. The repo seems quite empty, and I don't see any meaningful change when upgrading. What does "works" and "broken" mean? What am I supposed to see, on what page?

How can I be sure my attempt to fix the problem works if I can't see it broken in the first place?

"Tailwind stops working": how can I see that it stops working?