can you use attribute class definitions annotations typescript interface method signature code example

Example 1: classes in typescript

class Info {
  private name: string ;
  constructor(n:string){
    this.name = n ;
  };
  describe(){
    console.log(`Your name is  ${this.name}`);
  }
}

const a = new Info('joyous');
a.describe();

Example 2: interface ts one valu

// use type instead interface
type StringOrNull = string | null;