anchor.diff:  
       Logger.root.level = logLevel;
   
  -    logListener = Logger.root.onRecord.listen(environment.onLog);
  +    var logListener = Logger.root.onRecord.listen(environment.onLog);
   
       /// Set up other defaults.
       debounceDelay ??= const Duration(milliseconds: 250);
  
positive.code: // BSD-style license that can be found in the LICENSE file.
  
  import 'dart:async';
  
  import 'package:build_config/build_config.dart';
  import 'package:logging/logging.dart';
  
negative.code:     enableLowResourcesMode ??= false;
      trackPerformance ??= false;
  
      List<String> rootPackageFilesWhitelist;
      if (rootPackageConfig == null ||
          (rootPackageConfig.buildTargets.length == 1 &&
              rootPackageConfig.buildTargets.values.single.sources.include ==
  