mapEventToState is deprecated and not working anymore - flutter

Question

i am Working on Flutter Chat Application and when i tried to implement the MessageBloc i found that mapEventToState is not Working anymore in Version 8.0 of Bloc
This is MessageEvent
import 'package:chat/chat.dart';
import 'package:equatable/equatable.dart';
abstract class MessageEvent extends Equatable {
const MessageEvent();
factory MessageEvent.onSubscribed(User user) => Subscribed(user);
factory MessageEvent.onMessageSent(List<Message> messages) =>
MessageSent(messages);
#override
List<Object?> get props => [];
}
class Subscribed extends MessageEvent {
final User user;
Subscribed(this.user);
#override
List<Object?> get props => [user];
}
class MessageSent extends MessageEvent {
final List<Message> messages;
MessageSent(this.messages);
#override
List<Object> get props => [messages];
}
class MessageReceived extends MessageEvent {
MessageReceived(this.message);
final Message message;
#override
List<Object> get props => [message];
}
And this is MessageState
import 'package:chat/chat.dart';
import 'package:equatable/equatable.dart';
abstract class MessageState extends Equatable {
const MessageState();
factory MessageState.initial() => MessageInitial();
factory MessageState.sent(Message message) => MessageSentSuccesfully(message);
factory MessageState.received(Message message) =>
MessageReceivedSuccesfully(message);
#override
List<Object> get props => [];
}
class MessageInitial extends MessageState {}
class MessageSentSuccesfully extends MessageState {
final Message message;
const MessageSentSuccesfully(this.message);
#override
List<Object> get props => [message];
}
class MessageReceivedSuccesfully extends MessageState {
final Message message;
const MessageReceivedSuccesfully(this.message);
#override
List<Object> get props => [message];
}
and finally this is MessageBloc
import 'dart:async';
import 'package:bloc/bloc.dart';
import 'package:chat/chat.dart';
import 'package:flutter_newapp/src/blocs/message/message_event.dart';
import 'package:flutter_newapp/src/blocs/message/message_state.dart';
class MessageBloc extends Bloc<MessageEvent, MessageState> {
final IMessageService _messageService;
StreamSubscription? _subscription;
MessageBloc(this._messageService) : super(MessageState.initial());
#override
Stream<MessageState> mapEventToState(MessageEvent event) async* {
if (event is Subscribed) {
await _subscription?.cancel();
_subscription = _messageService
.messages(activeUser: event.user)
.listen((message) => add(MessageReceived(message)));
}
if (event is MessageReceived) {
yield MessageState.received(event.message);
}
if (event is MessageSent) {
final message = await _messageService.send(event.messages);
yield MessageState.sent(message);
}
}
#override
Future<void> close() {
_subscription?.cancel();
_messageService.dispose();
return super.close();
}
}
Can anyone propose me a Solution to Rewrite the MessageBloc in the new Version of Bloc ?
i am trying to move from version 7.1 of Bloc to 8.1 or the Latest version of Bloc and try to learn the new implementation of Blocs in Flutter