opt.

lib/core/utils/icloud.dart

@@ -25,11 +25,9 @@ class SyncResult<T, E> {
   }
 }
 
-class ICloud {
+abstract final class ICloud {
   static const _containerId = 'iCloud.tech.lolli.serverbox';
 
-  const ICloud._();
-
   /// Upload file to iCloud
   ///
   /// - [relativePath] is the path relative to [docDir],

lib/core/utils/platform/auth.dart

@@ -5,9 +5,7 @@ import 'package:local_auth/local_auth.dart';
 import 'package:toolbox/core/utils/platform/base.dart';
 import 'package:local_auth/error_codes.dart' as errs;
 
-class BioAuth {
-  const BioAuth._();
-
+abstract final class BioAuth {
   static final _auth = LocalAuthentication();
 
   static bool get isPlatformSupported => isAndroid || isIOS || isWindows;

lib/core/utils/share.dart

@@ -5,9 +5,7 @@ import 'package:share_plus/share_plus.dart';
 import 'package:toolbox/core/extension/context/locale.dart';
 import 'package:toolbox/data/res/provider.dart';
 
-class Shares {
-  const Shares._();
-
+abstract final class Shares {
   static Future<bool> files(List<String> filePaths) async {
     for (final filePath in filePaths) {
       if (!await File(filePath).exists()) {