anchor.diff:  import "dart:async";
   import "dart:convert";
   
  +import "package:logging/logging.dart";
   import "package:crypto/crypto.dart";
   import "package:path/path.dart";
   import 'package:http/http.dart' as http;
  
positive.code: final String PACKAGES_DATA_URI = "http://pub.dartlang.org/packages.json";
  final String PACKAGE_STORAGE_ROOT = "gs://dartdocs.org/documentation";
  final String DOCUMENTATION_HTTP_ROOT = "http://storage.googleapis.com/dartdocs.org/documentation";
  final String BUILD_DOCUMENTATION_CACHE = "build_documentation_cache";
  final String BUILD_DOCUMENTATION_ROOT_PATH =
  "build_documentation_cache/hosted/pub.dartlang.org";
  final String DARTDOC_VIEWER_OUT = 'dartdoc-viewer/client/out';
  
  
  /**
   * Class prepresentation of `<package>.json` file.
  
negative.code:       workingDirectory: workingDirectory, runInShell: true);
    stdout.write(processResult.stdout);
    stderr.write(processResult.stderr);
    Logger.root.fine("docgen exit code = ${processResult.exitCode}");
    return processResult.exitCode;
  }
  
  