promise api technique

promises.ts

export class Worker {
  getLock(v: string, cb: Function){
     this.getLockInternal(v,cb);
  } 
  getLockp(v:string){
     return new Promise((resolve,reject) => {
       this.getLockInternal(v, (err,result) => {
          err ? reject(err) : resolve(result);
       });
     });
  }
}