React Uncaught ReferenceError: process is not defined

If You are facing same problem like this, it is so easy to solving.It is about your react-scripts library version. So;

-Remove package-lock.json
-Into package.json file;
1.Replace dependency "react-scripts" with "react-scripts": "4.0.3"
2.Add react-error-overlay into the dev dependencies with "react-error-overlay": "6.0.9"
-npm update
its done !