save before flutter upgrade

lib/internationalization/internationalization.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/foundation.dart';
+
+class AppLocalizations {
+  AppLocalizations(this.locale);
+
+  final Locale locale;
+
+  static AppLocalizations of(BuildContext context) =>
+      Localizations.of<AppLocalizations>(context, AppLocalizations)!;
+
+  static List<String> languages() => ['en'];
+
+  String get languageCode => locale.languageCode;
+  int get languageIndex => languages().contains(languageCode)
+      ? languages().indexOf(languageCode)
+      : 0;
+
+  String getText(String key) =>
+      (kTranslationsMap[key] ?? {})[locale.languageCode] ?? '';
+
+  String getVariableText({
+    String enText = '',
+  }) =>
+      [enText][languageIndex];
+}
+
+class AppLocalizationsDelegate extends LocalizationsDelegate<AppLocalizations> {
+  const AppLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) =>
+      AppLocalizations.languages().contains(locale.languageCode);
+
+  @override
+  Future<AppLocalizations> load(Locale locale) =>
+      SynchronousFuture<AppLocalizations>(AppLocalizations(locale));
+
+  @override
+  bool shouldReload(AppLocalizationsDelegate old) => false;
+}
+
+final kTranslationsMap =
+    <Map<String, Map<String, String>>>[].reduce((a, b) => a..addAll(b));