class BookingInfoEvent with _$BookingInfoEvent {
  // another (const factory) events ...
  const factory BookingInfoEvent._search({required int mid}) = _Search;
}

class _BookingInfoSearch with _$_BookingInfoSearch {
  const factory _BookingInfoSearch.searchBySearchBar() =_SearchBySearchBar;
  const factory _BookingInfoSearch.searchByQRScan() = _SearchByQRScan;
}

我想用下面的方式来表达上面的代码。

abstract class BookingInfoEvent {...}

abstract class _BookingInfoSearchEvent extends BookingInfoEvent {
  final int mid;
  // ... some data
  _BookingInfoSearchEvent(this.mid);
}
//
class BookingInfoBySearchBar extends _BookingInfoSearchEvent {
  BookingInfoByTextForm(int mid) : super(mid);
}

我想使用Freezed来划分Event类。我该怎么做？