Change the production JS code after build

Question

Hello everyone.

How are you?

I have got an offer from a client that I have to change the built version of the ReactJS code. You know that it is kind long messy code that we can't just change ( I think that ).

Is there a way to somehow parse it and make it like React?

Thank your answares in advance.

Have a good day.

I tried to analyized and make a change. I tried to fetch a data from an API and set some variable with the response. I expected some changes but I know React so it won't change 'cause lack of the re-render. ( States, forceUpdate etc..)