Figured out that v2 uses PostCSS under the hood (to use autoprefixer) but the documentation doesn't mention it at all. Is there an official way to configure built-in PostCSS plugins and/or add new plugins? The standard way to do it by adding a postcss.config.js file in the project root doesn't work.
yes
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But to answer your question, you'll have to modify the config internally with configureWebpack hooks.
The issue is related to the documentation which doesn't tell anything about built-in PostCSS. But ok.