Mixins typescript

type ClassConstructor<T> = new (...args: any[]) => T;

function withEZDebug<C extends ClassConstructor<{ getDebugValue(): object }>>(
  Class: C
) {
  return class extends Class {
    debug() {
      let Name = Class.name;
      let value = this.getDebugValue();
      return Name + '(' + JSON.stringify(value) + ')';
    }
  };
}

class HardToDebugUser {
  constructor(
    private id: number,
    private firstName: string,
    private lastName: string
  ) {}
  getDebugValue() {
    return {
      id: this.id,
      name: this.firstName + ' ' + this.lastName,
    };
  }
}

let User = withEZDebug(HardToDebugUser);
let user = new User(3, 'Emma', 'Gluzman');
console.log(user.debug());