It lets you write to files. Except that these are files that exist in a self contained virtual file system in the browser. You can do things like fs.writeFile()

It lets you write to files. Except that these are files that exist in a self contained virtual file system in the browser. You can do things like fs.writeFile() or fs.readFile() (like electron, but without needing a desktop app, but directly inside the browser), and push that entire file system to a remote git repository, or pull from one.