DayOfWeek type
Definiuje wartości dayOfWeek. Możliwe wartości to: "Poniedziałek", "Wtorek", "Środa", "Czwartek", "Piątek", "Sobota", "Niedziela"
type DayOfWeek =
| "Monday"
| "Tuesday"
| "Wednesday"
| "Thursday"
| "Friday"
| "Saturday"
| "Sunday"