FCalendarDayPickerStyle constructor
      const
      FCalendarDayPickerStyle({ 
    
- required TextStyle headerTextStyle,
 - required FCalendarEntryStyle current,
 - required FCalendarEntryStyle enclosing,
 - int? startDayOfWeek,
 - double tileSize = 42,
 
Creates a FCalendarDayPickerStyle.
Implementation
const FCalendarDayPickerStyle({
  required this.headerTextStyle,
  required this.current,
  required this.enclosing,
  this.startDayOfWeek,
  this.tileSize = 42,
}) : assert(
       startDayOfWeek == null || (DateTime.monday <= startDayOfWeek && startDayOfWeek <= DateTime.sunday),
       'startDayOfWeek ($startDayOfWeek) must be between DateTime.monday (1) and DateTime.sunday (7)',
     ),
     assert(0 < tileSize, 'tileSize ($tileSize) must be positive');