PostCSS Loader has been initialized using an options object that does not match the API schema

[strarsis]

You may want to try the Sage 9.x update branch that updates a lot of dependencies and fixes most if not all build issues:

Sage "9.1": Please test

Note: Changed Sage 9.2 to 9.1 (as 9.0.10 is the current release in master). Updated Sage 9.x You can now try out the Sage PR branch for webpack 5 and updated dependencies. The sage-installer which is used by Sage 9.x for adding framework support was also updated to add the right configuration and styles. Bootstrap 5 (Beta2) has been added for selection. Tailwind 2 is used now. Trying it out now! To prevent siloing of existing working forks of Sage 9 + (insert framework), please try this set…