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lib/components/extensions/theme_mode.dart

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+// Flutter imports:
+import 'package:flutter/material.dart' show ThemeMode;
+
+/// Расширение [ThemeMode]
+extension ThemModeExtension on ThemeMode {
+  ///
+  /// Получение инверсивного [ThemeMode]
+  ///
+  ThemeMode get inversed {
+    switch (this) {
+      case ThemeMode.system:
+        return ThemeMode.light;
+
+      case ThemeMode.light:
+        return ThemeMode.dark;
+
+      case ThemeMode.dark:
+        return ThemeMode.light;
+    }
+  }
+}