Design Patterns: Builder Pattern in TypeScript

user-builder.ts

class UserBuilder {
  public username!: string;
  public sex!: string;
  public age!: number;
  public photo!: string;
  public email!: string;

  setUserName(name: string) {
    this.username = name;
    return this;
  }

  setSex(sex: string) {
    this.sex = sex;
    return this;
  }

  setAge(age: number) {
    this.age = age;
    return this;
  }

  setPhoto(photo: string) {
    this.photo = photo;
    return this;
  }

  setEmail(email: string) {
    this.email = email;
    return this;
  }

  build() {
    return new User(this.username, this.sex, this.age, this.photo, this.email);
  }
}