Приложение на флаторе, настройки

client-mobile/lib/core/errors/errors.dart

@@ -0,0 +1,15 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'errors.freezed.dart';
+
+@freezed
+class AppError with _$AppError {
+  const factory AppError.unknown({String? message}) = UnknownError;
+  const factory AppError.network({String? message}) = NetworkError;
+  const factory AppError.unauthorized({String? message}) = UnauthorizedError;
+  const factory AppError.forbidden({String? message}) = ForbiddenError;
+  const factory AppError.notFound({String? message}) = NotFoundError;
+  const factory AppError.server({int? statusCode, String? message}) = ServerError;
+  const factory AppError.database({String? message}) = DatabaseError;
+  const factory AppError.validation({Map<String, String>? fieldErrors}) = ValidationError;
+}

client-mobile/lib/core/errors/result.dart

@@ -0,0 +1,30 @@
+import 'errors.dart';
+
+/// A generic class for handling success/failure results
+class Result<T> {
+  final T? data;
+  final AppError? error;
+
+  const Result.success(this.data) : error = null;
+  const Result.failure(this.error) : data = null;
+
+  bool get isSuccess => error == null;
+  bool get isFailure => error != null;
+
+  R when<R>({
+    required R Function(T data) onSuccess,
+    required R Function(AppError error) onFailure,
+  }) {
+    if (isSuccess) {
+      return onSuccess(data as T);
+    }
+    return onFailure(error!);
+  }
+
+  T getOrThrow() {
+    if (isFailure) {
+      throw error!;
+    }
+    return data as T;
+  }
+}