bookshelf/books_flutter/lib/bloc/library/library_state.dart

class LibraryState {
  final String searchQuery;
  final int tabIndex;

  const LibraryState({this.searchQuery = '', this.tabIndex = 0});

  LibraryState copyWith({String? searchQuery, int? tabIndex}) {
    return LibraryState(
      searchQuery: searchQuery ?? this.searchQuery,
      tabIndex: tabIndex ?? this.tabIndex,
    );
  }
}