I started working on a new project yesterday and starting getting this notice while using yarn start:
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.
I just confirmed that this also occurs on a completely fresh install. Have you noticed the same and is there a fix?
You have likely experienced two different problems. I’d recommend for you to keep using 9.0.9 to eliminate several issues causing confusion at the same time.
I have just noticed exactly the same problem, was getting errors Module build failed: ModuleNotFoundError: Module not found: Error: Can't resolve './images/wall.png' in... when running yarn build but installing 9.0.9 and moving all files to that resolved issue. Not sure what’s going wrong with 9.0.10?
You may want to try this sage 9 pull request that updates a lot of dependencies and webpack to v4, which should fix these issues: https://github.com/roots/sage/pull/2603