Update PostCSS packages

[raix]

Update postcss-loader@4.04 postcss-flexbugs-fixes@5.0.0 postcss-normalize@9.0.0

Changes:

• indent is no longer needed accordingly to changelog
• options from Object to Array syntax
• postcss is now a peer dependency

ref: https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md#400-2020-09-07

Part of making way for Webpack 5 #9994

Reference to initial pr #10003 reverted in #10216

[raix]

@ianschmitz & @ai I've created a new pr for updating postcss to v8

I do see multiple versions of postcss but I don't think it will be solved until all plugins are updated to the new plugin format (without a postcss dependency?)

postcss@7.0.21

• resolve-url-loader

postcss@7.0.35

• postcss-preset-env
• postcss-normalize Compatibility with PostCSS 8
• css-loader
• optimize-css-assets-webpack-plugin

postcss@8.2.4 (we could stay at 8.1.9)

• react-scripts

postcss@8.1.9

• postcss-safe-parser

regarding postcss-browser-comments I could not find any open issues regarding updating to postcss8

In our private build setup we also had to add autoprefixer as a dependency - but for now the CRA build haven't complained about it.

[ai]

LGTM

I do see multiple versions of postcss but I don't think it will be solved until all plugins are updated to the new plugin format (without a postcss dependency?)

Yeap, for the transition period we will still see PostCSS in deep dependencies.

[msalahz]

Any updates on this?

[ianschmitz]

Many thanks @raix. Sorry about the long delays

[raix]

No worries @ianschmitz :)

[msalahz]

When we should expect this to be released?

[radiosilence]

@raix does postcss-normalize 9 actually support postcss 8?

There's currently an active PR on master suggesting that it does not:

csstools/postcss-normalize#53

[raix]

@radiosilence Thanks it's been unclear as postcss should work with older plugins - we should bump normalize to 10.0.0

[radiosilence]

Yep, postcss-normalize 10.0.0 has been released so we should indeed bump it

[Bluefitdev]

Added the PR #10946