TypeScript OOP Polymorphism, Liskov Substitution Principle with Decorator Pattern

Barista.ts

// POLYMORPHISM
// Liskov Substitution principle with composition and the Decorator Pattern
// source: https://blog.appsignal.com/2022/04/06/principles-of-object-oriented-programming-in-typescript.html
interface Coffee {
    getCost(): number;
    getIngredients(): string;
}

class SimpleCoffee implements Coffee {
    getCost(): number {
        return 8;
    }
    getIngredients(): string {
        return "Coffee";
    }
}

abstract class CoffeeDecorator implements Coffee {
    constructor(private readonly decoratedCoffee: Coffee) { }

    getCost() {
        return this.decoratedCoffee.getCost();
    }

    getIngredients() {
        return this.decoratedCoffee.getIngredients();
    }
}

class WithMilk extends CoffeeDecorator {
    constructor(private readonly coffee: Coffee) {
        super(coffee);
    }

    getCost() {
        return super.getCost() + 2.5;
    }

    getIngredients() {
        return super.getIngredients() + ", Milk";
    }
}

class WithSugar extends CoffeeDecorator {
    constructor(private readonly coffee: Coffee) {
        super(coffee);
    }

    getCost() {
        return super.getCost() + 1;
    }

    getIngredients() {
        return super.getIngredients() + ", Sugar";
    }
}

class WithSprinkles extends CoffeeDecorator {
    constructor(private readonly c: Coffee) {
        super(c);
    }

    getCost() {
        return super.getCost() + 1.7;
    }

    getIngredients() {
        return super.getIngredients() + ", Sprinkles";
    }
}

class Barista {
    constructor(private readonly cupOfCoffee: Coffee) {}

    orders() {
        this.orderUp(this.cupOfCoffee);
        let cup: Coffee = new WithMilk(this.cupOfCoffee);
        this.orderUp(cup);
        cup = new WithSugar(cup);
        this.orderUp(cup);
        cup = new WithSprinkles(cup);
        this.orderUp(cup);
    }

    private orderUp(coffee: Coffee) {
        console.log(`Cost: ${coffee.getCost()}, Ingredients: ${coffee.getIngredients()}`);
    }
}

const barista = new Barista(new SimpleCoffee());
barista.orders();