'Why am I getting postcss warnings when I'm not using it?

I'm using NX to build a React demo and it has a dependency of postcss however I'm not using it and none of my webpack configs or anything else is using it either... Yet when I run yarn start I get the following warning in my CLI.

You did not set any plugins, parser, or stringifier. Right now, PostCSS does nothing. Pick plugins for your case on https://www.postcss.parts/ and use them in postcss.config.js.


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