According to CRA documentation, source maps are generated by default in production mode.
However, you can disable this behavior (generating source maps in production mode) by running GENERATE_SOURCEMAP=false ./node_modules/.bin/react-scripts build or if you want this behavior to be permanent, do one of the following solutions:
- Set GENERATE_SOURCEMAP=false in your .env file.
- Modify the scripts in your package.json and replace
"build": "react-scripts build"with"build": "GENERATE_SOURCEMAP=false react-scripts build"
https://facebook.github.io/create-react-app/docs/advanced-configuration