Factory Pattern

function Developer(name) {
  this.name = name;
}

function Tester(name) {
  this.name = name;
}

function CreateUser() {
  this.create = function (type, name) {
    switch (type.name) {
      case Developer.name:
        return new Developer(name);
      case Tester.name:
        return new Tester(name);
      default:
        return new Tester(name);
    }
  };
}

const developer = new CreateUser().create(Developer, "dev101");
const tester = new CreateUser().create(Tester, "tester101");

console.log(developer);
console.log(tester);

class Developer {
  constructor(name) {
    this.name = name;
  }
}

class Tester {
  constructor(name) {
    this.name = name;
  }
}

class CreateUser {
  constructor() {}
  create(type, name) {
    switch (type.name) {
      case Developer.name:
        return new Developer(name);
      case Tester.name:
        return new Tester(name);
      default:
        return new Tester(name);
    }
  }
}

const developer = new CreateUser().create(Developer, "dev101");
const tester = new CreateUser().create(Tester, "tester101");

console.log(developer);
console.log(tester);