import 'package:equatable/equatable.dart'; class MailPriorityHeader with EquatableMixin { static const String firstXPriority = '1'; static const String highImportance = 'high'; static const String urgentPriority = 'urgent'; final String? xPriority; final String? importance; final String? priority; MailPriorityHeader({ this.xPriority, this.importance, this.priority, }); @override List get props => [ xPriority, importance, priority, ]; }