Singletone pattern

class Singletone {
  private uniqueInstance: Singletone;
  name = "vasya";
  private constructor() {}

  public static getInstance() {
    if (this.uniqueInstance === undefined) {
      this.uniqueInstance = new Singletone();
    }
    return this.uniqueInstance;
  }

  setName(name: string) {
    this.name = name;
  }

  getName() {
    return this.name;
  }
}

let test1 = Singletone.getInstance();
test1.setName("petya");
console.log(test1.getName());
let test2 = Singletone.getInstance();
console.log(test2.getName());