I got tired of managing two codebases for free and premium versions of my plugins. Every WordPress plugin developer knows this pain. You either keep separate repos or rely on clunky add-on systems.

WP Plugin Builder is a set of build scripts for freemium plugins in a single codebase. Code block splitting between free and pro. Automatic tag replacement. React compilation for the block editor. Development mode with hot reloading.

It's built on WordPress Scripts, no extra tools like Gulp. Write in the src folder, and it generates separate zip files for each version.

I open-sourced it. If you build plugins for a living, it will save you hours every week.