pizza.ts

export abstract class PizzaFactory {
  protected abstract create(): Pizza;
}

export class ProsciuttoFactory extends PizzaFactory {
  public create(): Pizza {
    let pizza = new Pizza();
    pizza.addIngredients([ tomatoes, mozzarella, ham, salt, oliveOil ]);
    return pizza;
  }
}

export class MargheritaFactory extends PizzaFactory {
  public create(): Pizza {
    let pizza = new Pizza();
    pizza.addIngredients([ tomatoes, mozzarella, basil, salt, oliveOil ]);
    return pizza;
  }
}