Handling Abstract Properties in Extended Classes Using Class API

abstract class Human extends S.Class<Human>('Human')({ name: S.String }) {
  abstract title: string;
  get fullname(){ return `${this.title} ${this.name}` }
}

class Doctor extends Human.extend<Doctor>('Doctor')({ specialty: S.String }) {
  // title = "Dr."
}

new Doctor({name: 'Phil', specialty: 'Psychology'}).fullname // "undefined Phil"