MIgrating to bloc >= 7.2.0 with multiple enevts and shared preferences - flutter

Question

I am working on a login page that was created with the pre >=7.2.0 bloc version and I am having issues migrating this AuthBloc because it has multiple events and shared preferences within.
class AuthBloc extends Bloc<AuthEvent, AuthStates> {
AuthBloc() : super(Initialization());
Stream<AuthStates> mapEventToState(AuthEvent event) async* {
yield WaitingAuth();
switch (event.runtimeType) {
case InitEvent:
SharedPreferences prefs = await SharedPreferences.getInstance();
bool login = prefs.getBool('login');
if (login == null || !login) {
prefs.clear();
yield Initialization();
break;
} else {
String token = prefs.getString('token');
String tokenJWT = prefs.getString('tokenJWT');
if (token == null ||
tokenJWT == null ||
token.isEmpty ||
tokenJWT.isEmpty) {
yield Initialization();
} else {
setToken(token);
setJWTToken(tokenJWT);
final response = await Api.getAccount();
if (response is Account) {
final sensorResponse = await Api.getDevices();
if (sensorResponse is List<Sensor>) {
yield SuccessAuth(account: response, sensors: sensorResponse);
} else {
yield SuccessAuth(account: response, sensors: []);
}
} else {
yield Initialization();
}
}
}break;
default:
SentryCapture.error(
loggerName: 'AuthBloc',
environment: 'switch',
message: 'unhandled event($event)');
}
}
}
How do I go about it?

Answer 1

With flutter bloc >= 7.2.0 you have to use the new on< Event> API and replace your yield with emit. Here is a small example.
MyBloc() : super (MyInitialState()) {
on<MyEvent1>((event, emit) => emit(MyState1()));
on<MyEvent2>((event, emit) => emit(MyState2()));
}
For your case do the following.
AuthBloc() : super(Initialization()) {
on<AuthEvent>((event, emit) {
emit(WaitingAuth());
// Your logic
}
}