sortedTodoListState.dart

final sortedTodoListState = StateProvider<List<Todo>?>((ref) {
  final List<Todo>? todoList = ref.watch(_todoListState);

  if (ref.watch(_sortOrderState) == SortOrder.ASC) {
    todoList?.sort((a, b) => a.timestamp.compareTo(b.timestamp));
  } else {
    todoList?.sort((a, b) => b.timestamp.compareTo(a.timestamp));
  }
  return todoList;
});