Example of cubit state using const/factory in only one state.

url_state.dart

part of 'url_cubit.dart';

enum ErrorType { defaultError, urlAlreadyExists, none }

class UrlState extends Equatable {
  const UrlState({
    this.isLoading,
    this.url,
    this.urlList,
    this.hasError,
  });

  /// const way (syntax sugar for factory way)
  const UrlState.initial()
      : this(
          isLoading: false,
          url: const UrlModel(),
          urlList: const <UrlShortenerModel>[],
          hasError: ErrorType.none,
        );

  /// Factory way
  // factory UrlState.initial() => const UrlState(
  //       isLoading: false,
  //       url: UrlModel(),
  //       urlList: <UrlShortenerModel>[],
  //       hasError: ErrorType.none,
  //     );

  final bool isLoading;
  final UrlModel url;
  final List<UrlShortenerModel> urlList;
  final ErrorType hasError;

  @override
  List<Object> get props => [
        isLoading,
        url,
        urlList,
        hasError,
      ];
}