anchor.diff:  import 'dart:async';
   import 'dart:math' as math;
   
  -import 'package:json_annotation/json_annotation.dart';
   import 'package:vm_service/vm_service.dart';
   
   import '../globals.dart';
  
positive.code:         'gc': isGC,
        };
  
    @JsonKey(name: 'timestamp')
    final int timestamp;
  
    @JsonKey(name: 'rss')
    final int rss;
  
    @JsonKey(name: 'capacity')
    final int capacity;
  
    @JsonKey(name: 'used')
    final int used;
  
    @JsonKey(name: 'external')
    final int external;
  
    @JsonKey(name: 'gc')
    final bool isGC;
  }
  
  
negative.code:   }
  }
  
  class HeapSample {
    HeapSample(
      this.timestamp,
  