added BlocObserver example

lib/core/bloc/custom_bloc_observer.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+class CustomBlocObserver extends BlocObserver {
+  const CustomBlocObserver();
+
+  @override
+  void onCreate(BlocBase bloc) {
+    debugPrint('--- ${bloc.runtimeType} created');
+
+    super.onCreate(bloc);
+  }
+
+  @override
+  void onEvent(Bloc bloc, Object? event) {
+    debugPrint('--- ${bloc.runtimeType} received event: $event');
+
+    super.onEvent(bloc, event);
+  }
+
+  @override
+  void onChange(BlocBase bloc, Change change) {
+    debugPrint('--- ${bloc.runtimeType} changed state: $change');
+
+    super.onChange(bloc, change);
+  }
+
+  @override
+  void onTransition(Bloc bloc, Transition transition) {
+    debugPrint('--- ${bloc.runtimeType} moved to: $transition');
+
+    super.onTransition(bloc, transition);
+  }
+
+  @override
+  void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
+    debugPrint('--- Error in ${bloc.runtimeType}: $error');
+
+    super.onError(bloc, error, stackTrace);
+  }
+
+  @override
+  void onClose(BlocBase bloc) {
+    debugPrint('--- ${bloc.runtimeType} closed');
+
+    super.onClose(bloc);
+  }
+}

lib/features/profile/bloc/profile_bloc_event.dart

@@ -6,6 +6,11 @@ class ProfileBlocEventFetch extends ProfileBlocEvent {
   ProfileBlocEventFetch({
     required this.isLogIn,
   });
+
+  @override
+  String toString() {
+    return 'ProfileBlocEventFetch{isLogIn: $isLogIn}';
+  }
 }
 
 class ProfileBlocEventLogIn extends ProfileBlocEvent {}

lib/features/profile/bloc/profile_bloc_state.dart

@@ -9,6 +9,11 @@ class ProfileBlocStateLoading extends ProfileBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateLoading{}';
+  }
 }
 
 class ProfileBlocStateLoaded extends ProfileBlocState {
@@ -30,6 +35,11 @@ class ProfileBlocStateLoaded extends ProfileBlocState {
 
   @override
   int get hashCode => Object.hash(profile, isLoggedIn);
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateLoaded{profile: $profile, isLoggedIn: $isLoggedIn}';
+  }
 }
 
 class ProfileBlocStateError extends ProfileBlocState {
@@ -46,4 +56,9 @@ class ProfileBlocStateError extends ProfileBlocState {
 
   @override
   int get hashCode => error.hashCode;
+
+  @override
+  String toString() {
+    return 'ProfileBlocStateError{error: $error}';
+  }
 }

lib/features/profile/model/profile.dart

@@ -26,4 +26,9 @@ class Profile {
 
   @override
   int get hashCode => firstName.hashCode ^ lastName.hashCode;
+
+  @override
+  String toString() {
+    return 'Profile{firstName: $firstName, lastName: $lastName}';
+  }
 }

lib/features/users/bloc/users_bloc_state.dart

@@ -12,6 +12,11 @@ sealed class UsersBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocState{}';
+  }
 }
 
 class UsersBlocStateLoading extends UsersBlocState {
@@ -23,6 +28,11 @@ class UsersBlocStateLoading extends UsersBlocState {
 
   @override
   int get hashCode => runtimeType.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocStateLoading{}';
+  }
 }
 
 class UsersBlocStateLoaded extends UsersBlocState {
@@ -53,6 +63,11 @@ class UsersBlocStateLoaded extends UsersBlocState {
       page,
     );
   }
+
+  @override
+  String toString() {
+    return 'UsersBlocStateLoaded{users (count): ${users.length}, canLoadMore: $canLoadMore, page: $page}';
+  }
 }
 
 class UsersBlocStateError extends UsersBlocState {
@@ -69,4 +84,9 @@ class UsersBlocStateError extends UsersBlocState {
 
   @override
   int get hashCode => error.hashCode;
+
+  @override
+  String toString() {
+    return 'UsersBlocStateError{error: $error}';
+  }
 }

lib/main.dart

@@ -1,3 +1,4 @@
+import 'package:bloc_example/core/bloc/custom_bloc_observer.dart';
 import 'package:bloc_example/core/di/di.dart';
 import 'package:bloc_example/features/home/home_page.dart';
 import 'package:bloc_example/features/profile/bloc/profile_bloc.dart';
@@ -9,6 +10,7 @@ import 'package:path_provider/path_provider.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  Bloc.observer = const CustomBlocObserver();
   HydratedBloc.storage = await HydratedStorage.build(
     storageDirectory: kIsWeb
         ? HydratedStorageDirectory.web