Support PostCSS 8

[jonathantneal]

Hey, neat project. I did notice this is still running PostCSS 7. I also saw that it hasn’t had a commit since April. Did you have a chance to see that PostCSS 8 is out? The creators of the project have even released this migration guide.

• Can we expect support for PostCSS 8?
• Are you still working on the project?
• Can I help? 😄

Oh wait hold up I’m me. Umm...

• Yes!
• Yes, tho proof must be in the pudding.
• Of course.

[Semigradsky]

I will be happy to help 😸

[Semigradsky]

Plugin	Ready for Postcss 8	Note
css-blank-pseudo	✅ Ready - v2.0.0	Plugin require JS
css-has-pseudo	✅ Ready - v2.0.0	Plugin require JS
css-prefers-color-scheme	✅ Ready - v5.0.0	Plugin require JS; >92% browser support
postcss-color-functional-notation	✅ Ready - v4.0.0	>93% browser support
postcss-color-hex-alpha	✅ Ready - v7.0.0	>94% browser support
postcss-custom-media	✅ Ready - v8.0.0
postcss-custom-selectors	✅ Ready - v6.0.0
postcss-dir-pseudo-class	✅ Ready - v6.0.0
postcss-double-position-gradients	✅ Ready - v3.0.0	>93% browser support
postcss-env-function	✅ Ready - v4.0.0	>93% browser support
postcss-focus-visible	✅ Ready - v6.0.0	Plugin require JS
postcss-focus-within	✅ Ready - v5.0.0	Plugin require JS; >94% browser support
postcss-font-variant	✅ Ready - v5.0.0
postcss-gap-properties	✅ Ready - v3.0.0	>93% browser support
postcss-image-set-function	✅ Ready - v4.0.0
postcss-lab-function	✅ Ready - v4.0.0
postcss-logical	✅ Ready - v5.0.0
postcss-media-minmax	✅ Ready - v5.0.0
postcss-nesting	✅ Ready - v8.0.0
postcss-overflow-shorthand	✅ Ready - v3.0.0	>92% browser support
postcss-page-break	✅ Ready - v3.0.2
postcss-place	✅ Ready - v7.0.0	>94% browser support
postcss-selector-not	✅ Ready - v5.0.0	>91% browser support

Candidates for removing?

Plugin	Ready for Postcss 8	Note
postcss-attribute-case-insensitive	✅ Ready - v5.0.0	96.35% browser support - candidate for removing?
postcss-color-gray	PR was merged. Wait new release.	Was removed from Spec - candidate for removing?
postcss-color-mod-function	PR was merged. Wait new release.	Was removed from Spec - candidate for removing?
postcss-color-rebeccapurple	✅ Ready - v7.0.0	97.19% browser support - candidate for removing?
postcss-custom-properties	✅ Ready - v12.0.0	Has limitations. Also 96.21% browser support - candidate for removing?
postcss-font-family-system-ui	✅ Ready - v5.0.0	Currently postcss-preset-env use 'fork'; 95.07% browser support - candidate for removing?
postcss-initial	✅ Ready - v4.0.0	97.88% browser support - candidate for removing?
postcss-pseudo-class-any-link	✅ Ready - v7.0.0	97.38% browser support - candidate for removing?
postcss-replace-overflow-wrap	✅ Ready - v4.0.0	97.15% browser support - candidate for removing?
postcss-selector-matches	PR: postcss/postcss-selector-matches#22	:mathes was renamed to :is and incorrectly implemented - candidate for removing?

[Semigradsky]

Candidates for adding

Plugin	Ready for Postcss 8	Note
postcss-font-format-keywords	✅ Ready - v2.0.0
postcss-clamp	✅ Ready - v2.0.0	>92% browser support
postcss-normalize-display-values	✅ Ready - v5.0.0
postcss-ic-unit	✅ Ready - v2.0.0
postcss-opacity-percentage	✅ Ready - v1.0.0

[JLHwung]

Note that it is also blocked by an upstream postcss-tape issue: csstools/postcss-tape#5

[goto-bus-stop]

PR for postcss-color-hex-alpha: postcss/postcss-color-hex-alpha#15

[heath-freenome]

How close are you to making the simplest update possible ready (i.e. just porting to the Once() syntax), then doing the hard work of switching to using the Rule(), AtRule(), etc... later?