New folder with the version 0.3.0 !
In this folder, you can generate js script file for Gutenberg editor.
The files are compilated with vite.js, like the assets for the front.
The files are in
admin/assets/css for CSS.
You have a example in
admin/assets/js/visibility.jsx for extend core/group block.
You have two mode :
npm run dev:admin
Mode build (production):
npm run build:admin
npm run build, this assets are as well compilated. This files are automatically imported
Bonus ! You have a
admin/assets/css/custom-login.css file for customize the login page. This file isn't preprocessed. Use only standard css