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:convert';
   
  
positive.code:   final String actionText;
  
    final Function(
      DevToolsJsonFile firstImportedFile,
      DevToolsJsonFile secondImportedFile,
      void Function(String error) onError,
    ) onAction;
  
  
negative.code:         widget.instructions,
          textAlign: TextAlign.center,
          style: TextStyle(
            color: Theme.of(context).textTheme.headline1!.color,
          ),
        ),
      );
  