anchor.diff:  // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
   
  -// @dart=2.9
  +// ignore_for_file: import_of_legacy_library_into_null_safe
   
   import 'dart:async';
   
  
positive.code:     this.isRunningOnDartVM,
    });
  
    factory OfflineConnectedApp.parse(Map<String, Object> json) {
      if (json == null) return null;
      return OfflineConnectedApp(
        isFlutterAppNow: json[isFlutterAppKey],
        isProfileBuildNow: json[isProfileBuildKey],
        isDartWebAppNow: json[isDartWebAppKey],
        isRunningOnDartVM: json[isRunningOnDartVMKey],
      );
    }
  
    @override
    final bool isFlutterAppNow;
  
    @override
    final bool isProfileBuildNow;
  
    @override
    final bool isDartWebAppNow;
  
    @override
    final bool isRunningOnDartVM;
  }
  
negative.code:       flutterVersionServiceListenable.addListener(listener = () async {
          final registered = flutterVersionServiceListenable.value;
          if (registered) {
            _flutterVersionCompleter.complete(FlutterVersion.parse(
                (await serviceManager.flutterVersion).json!));
          }
        });
  
  