added new function

lib/src/common/services/storage/shared_preferences_service_new.dart

@@ -0,0 +1,26 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'storage_service.dart';
+
+class SharedPreferencesServicesNew implements StorageService {
+  SharedPreferencesServicesNew(this._sharedPreferences);
+  final SharedPreferencesAsync _sharedPreferences;
+
+  @override
+  Future<void> remove(String key) async => await _sharedPreferences.remove(key);
+
+  @override
+  Future<String?> get(String key) async =>
+      await _sharedPreferences.getString(key);
+
+  @override
+  Future<void> set(String key, String data) async =>
+      await _sharedPreferences.setString(key, data.toString());
+
+  @override
+  Future<void> clear() async => await _sharedPreferences.clear();
+
+  @override
+  Future<bool> has(String key) async =>
+      await _sharedPreferences.containsKey(key) ? true : false;
+}

lib/src/common/services/storage/storage_service.dart

@@ -0,0 +1,12 @@
+/// Storage service interface
+abstract class StorageService {
+  Future<void> remove(String key);
+
+  Future<String?> get(String key);
+
+  Future<void> set(String key, String data);
+
+  Future<void> clear();
+
+  Future<bool> has(String key);
+}