Wrapper-ES5.js

var yourApp = (function (/* outer scope variables*/) {
  function User () {
    /* stuff */
  }
  
  User.prototype.someMethod (arg) {
    state.users[this.id].something = arg;
  }
  
  function App () {
    /* stuff */
  }
  
  var state = {
    /* app state stuff */
    users: {
      /* user state stuff */
    }
  };
  
  return {
    user: function () { return new User(); },
    app: function () { return new App(); }
  }
})(/* outer scope variables */);