Upgrade @vue/compiler-sfc to PostCSS 8

[Uninen]

What problem does this feature solve?

Now that Tailwind 2.0 is out, it would be nice to get @vue/compiler-sfc upgraded to PostCSS 8.

All PostCSS 7 plugins are compatible with PostCSS 8, it's fully backwards compatible, so this probably isn't a huge effort.

This also affects all Vite users as Vite uses @vue/compiler-sfc for CSS processing: vitejs/vite#873

What does the proposed API look like?

Bump PostCSS 7 to PostCSS 8.

[dnlsndr]

This has been a nuisance for me, since PCSS 8 came out. It would be really nice to have v8 running as default in vue, so one doesn't have to always take care which old PCSS plugin versions to install. Would be great to have this!

[posva]

Do not comment +1 on issues, use the reactions.
Locking to prevent spam since there isn't anything left to discuss but people can still track the progress of the issue 🙂

[songololo]

For those waiting for official v8 support for the purpose of tailwindcss, an FYI that v2 of tailwind currently has a bridging compatibility version per tailwindcss@compat, useful until above issues are resolved...

[nomadboy20]

There is lot of people waiting for major support of PostCSS (beacuse of tailwindcss)