// compiler target es6 
class UsersController { 

  constructor(templateService, calendarsServer) {
    this.templateService = templateService;
    this.calendarsServer = calendarsServer;
  }

  indexAction(request, response) {
  }

  get index() {
  }

};

// compiler target es5
function UsersController1(templateService, calendarsServer) {
    this.templateService = templateService;
    this.calendarsServer = calendarsServer;
}

UsersController1.prototype.indexAction = function(request, response) {
}

const p1 = UsersController.prototype;
const p2 = UsersController1.prototype;

console.log(p1);
console.log(p2);

console.log(Object.keys(p1).length); // returns 0
console.log(Object.keys(p2).length); // returns 1