the code appears in inspect element > app/src, however i removed the map files

I just knew how to remove the map files and it actually it was removed from the folder called static/js but it still appears under app/src. I use "build": "react-scripts build && rm build/static/js/*.map && rm build/static/css/*.map" and "postbuild": "rimraf build/**/*.map" in the package.json. so how to removed the code from app/src?