Don’t be lost in complex JS config to just build a Gutenberg block. Set it up minimal and focus on your main work.
Gutenberg
How to Detect Gutenberg via JavaScript and PHP
The elegant way to detect if Gutenberg is active on the current admin screen with JavaScript and PHP.
A Beginners Guide to the WordPress Gutenberg Editor
Easy step-by-step guide to create a post or page in WordPress Gutenberg Editor with its extremely user-friendly interface.