opt.

lib/core/provider_base.dart

@@ -1,31 +0,0 @@
-import 'dart:async';
-
-import 'package:flutter/widgets.dart';
-
-class ProviderBase with ChangeNotifier {
-  void setState(void Function() callback) {
-    callback();
-    notifyListeners();
-  }
-}
-
-class BusyProvider extends ProviderBase {
-  bool _isBusy = false;
-  bool get isBusy => _isBusy;
-
-  setBusyState([bool isBusy = true]) {
-    _isBusy = isBusy;
-    notifyListeners();
-  }
-
-  FutureOr<T> busyRun<T>(FutureOr<T> Function() func) async {
-    setBusyState(true);
-    try {
-      return await Future.sync(func);
-    } catch (e) {
-      rethrow;
-    } finally {
-      setBusyState(false);
-    }
-  }
-}