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interface ParkingSystem {    addCar(carType: number): boolean;}export default ParkingSystem;function ParkingSystem(    big: number,    medium: number,    small: number,): ParkingSystem {    const park = new Map<number, number>();    park.set(1, big);    park.set(2, medium);    park.set(3, small);    function addCar(carType: number): boolean {        const full = park.get(carType) === 0;        if (full) return false;        else {            park.set(carType, -1 + (park.get(carType) || 0));            return true;        }    }    return { addCar };}