HarmonyOS SDK .d.ts 声明问题

class UserInfo { 
  private uid: string; 
  private name: string; 
  private age: number; 
  constructor(uid: string) { 
    this.uid = uid; 
  } 
  getUserInfo(): Promise<UserInfo>; 
  getUserInfo(callback: (user: UserInfo) => void): void; 
  getUserInfo(callback?: (user: UserInfo) => void): Promise<UserInfo> | void { 
    if (callback) { 
      let user = new UserInfo(this.uid); 
      user.name = "testName"; 
      user.age = 12; 
      if (callback) { 
        callback(user); 
      } 
    } else { 
      return new Promise((resolve: Function, reject: Function) => { 
        let user = new UserInfo(this.uid); 
        user.name = "testName"; 
        user.age = 12; 
        resolve(user); 
      }); 
    } 
  }