Do you know some example code of OOP Vanilla JS

Hi everyone…
I am at the beginning of learning JS. I am wondering if you can refer me to some repositories that have OOP JS .
My goal is to expand my knowledge about OOP JS by watching and modifying code.
I`m looking for small and medium projects, but i won’t complain if you can point to some good large organize code.
Maybe even some open source project that i can contribute.
Also if you know any repositories that will be god for beginner it will be appreciated.

There are two main ways to do OOP in JS. The classic way is doing Prototypes, which is used in ES5 and below.

Currently what is being used is ECMAScript 6+ Classes.

This is where MDN really helps so try to refer on MDN a lot.