Super Blocks plugin directory structure:

/src/Blocks/SuperImageBlock.php <-- main block class /assets/js/blocks.js <-- Gutenberg block JS (was gutenberg_blocks.js) /assets/js/frontend.js <-- Frontend JS (was frontend_js.js) /assets/css/blocks-editor.css <-- Editor CSS (was super_blocks_css.css) /assets/css/blocks-frontend.css <-- Frontend CSS (copy or split as needed) /languages/ <-- translation files

All PHP classes should use PSR-4 namespaces and be placed in /src/Blocks/.