Front End Functionalities of JavaScript

Front End Functionalities of JavaScript, I am looking for someone who is an expert in object-oriented programming in javascript You will need to rewrite modules/code in this Git repo. Outcome expected- To get everything working with the revised code as the original or even better. This is a really simple tool/script if you know what you are doing. Please reach out, and include "Callstack" in your message. I am looking for someone to do this immediately. Thank you.