I worked out the bugs, added some formatting, and tested it.
Looking for some tips, pointers, critiques.
Nice!
It would be cool to see if this script gets hosted somewhere so users don’t have to visit your repo, download and run it. Using a sandbox like https://repl.it/~ could be helpful.
Have you considered using Prettier? The easiest way to use it is through vscode, you can tweak some settings so that whenever you save a file, it automatically formats it for you.
I have been letting ESLint do the formatting for me recently.