Factory Module pattern in modren js

es6_module_with_instances.js

window.Namespace = window.Namespace || {};

// Usage:
// Namespace.Rolenamee.init({ prop1: '.prop1', prop2: '.prop2' })
const Rolename = (function Rolename(expose) {
  // private class/constructor
  function Implementor({ foo, bar }) {
    this.foo = $(foo);         // store a value that will be needed asyncronously
    $(bar).on("event", () => { // set up an asyncronous reaction
      this.foo.method();       // use the stored value asyncronously through =>'s lexical `this`
    });
  }

  // Return a new Implementor instance bound to a particular `foo` and `bar` values
  expose.init = function init({ foo, bar }) {
    return new Implementor({ foo, bar });
  };

  return expose;
})({});

window.Namespace.Rolename = Rolename;