class Dupa {
    public getCars(): Cars {
        return this.carsRepository.getCars()
            .then((cars) => {
                return cars;
            })
            .then((cars) => {
                cars.forEach((car) => {
                    this.someRepository.updateSomethingByCar(car)
                        .then((sth) => console.log(sth));
                });
            })
            .catch((err) => console.log(err));
    }
}