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abstract class Car{
    public description: string;

    public getDescription() : string{
        return this.description;
    };

    public abstract cost(): number;

    public abstract hello(): void;
}

class ModelS extends Car{
    public description = "Model S";

    public cost(): number {
        return 73000;
    }

    public hello(): void {
        console.log("hello from ModelS");
    }
}

let myTesla = new ModelS();
myTesla = new SmartAirSuspension(myTesla);
myTesla = new RearFacingSeats(myTesla);

console.log(myTesla.hello());