I'm writing a short game hacking project. As such, I need a way to retrieve a class that is wrapped in an anonymous function without any global references. The simplified class layout looks like this:

class n {
  constructor() {
    this.test = localStorage.getItem("test");
  }
}

My approach is to proxy the localStorage.getItem function called inside the constructor. The issue appears when I access the caller: it returns null. My code is as following:

class n {
  constructor() {
    this.test = localStorage.getItem("test");
  }
}

localStorage.getItem = new Proxy(localStorage.getItem, {
  apply: function(target, that, args) {
    console.log(arguments.callee.caller);
  }
})

const l = new n();