This is in BETA and the first version is incredibly simple. All it can do is help you create an extend.php file for situations where you need JavaScript to load for all posts/pages. This is usually required due to Flarum being a single page app. So, simply loading JavaScript in your footer the normal way won’t always work depending on what you are trying to do.
Right now, you need to know everything else that’s needed besides the extend.php file to make an extension. Such as the composer.json file. This does not help with that. But, look at one of my Flarum extensions at https://github.com/zerosonesfun to see how you can take this extend file, add a few other things, and have an extension. From there, you'd need to get it all on GitHub, submit it to Packagist.org, and then you can install it with composer like other extensions.
Take me to the generator
