flutter_bloc 0.22.1 in flutter :
flutter bloc new version 0.22.1 error is currentState and dispatch() method is deprecated. This flutter tutorial post is one of easy solution provide.

currentState solution
currentState to replace: state
state is return the current state of the Bloc.
For example:
if (event is PasswordInput) { yield currentState.copyWith(password: event.password); }
Solution
if (event is PasswordInput) { yield state.copyWith(password: event.password); }
dispatch() solution
dispatch() to replace: add()
Notifies the [Bloc] of a new [Event] which triggers mapEventToState
. If close
has already been called, any subsequent calls to add
will be delegated to the onError
method which can be overriden at the [Bloc] as well as the [BlocDelegate] level.
void login(callback) { dispatch(Login(callback: callback)); }
Solution
void login(callback) { add(Login(callback: callback)); }
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