Thanks, I use it for script build simple in react project. It worked https://monday-crm-clone.herokuapp.com/

"build": "GENERATE_SOURCEMAP=false react-scripts build"

That's an interesting way of hiding your code. As I understand it, source maps are supposed to be used for aiding debugging during development anyways.

Another way may be to use a JavaScript obfuscator. So not even you can read your own code 😝 (check obfuscator.io)