Init core module

core/lib/presentation/state/app_state.dart

@@ -0,0 +1,14 @@
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:meta/meta.dart';
+import 'package:equatable/equatable.dart';
+
+@immutable
+abstract class AppState with EquatableMixin {
+  final Either<Failure, Success> viewState;
+
+  AppState(this.viewState);
+
+  @override
+  List<Object?> get props => [viewState];
+}

core/lib/presentation/state/failure.dart

@@ -0,0 +1,5 @@
+import 'package:equatable/equatable.dart';
+
+abstract class Failure extends Equatable {}
+
+abstract class FeatureFailure extends Failure {}

core/lib/presentation/state/success.dart

@@ -0,0 +1,15 @@
+import 'package:equatable/equatable.dart';
+
+abstract class Success with EquatableMixin {}
+
+abstract class ViewState extends Success {}
+
+class UIState extends ViewState {
+  static final idle = UIState();
+  static final loading = UIState();
+
+  UIState() : super();
+
+  @override
+  List<Object?> get props => [];
+}