anchor.diff:    String target,
     String flxPath,
     String aotPath,
  -  List<String> addFiles,
     ApkKeystoreInfo keystore
   }) async {
     // Validate that we can find an android sdk.
  
positive.code:       target: argResults['target'],
        flxPath: argResults['flx'],
        aotPath: argResults['aot-path'],
        addFiles: argResults['add-file'],
        keystore: (argResults['keystore'] ?? '').isEmpty ? null : new ApkKeystoreInfo(
          keystore: argResults['keystore'],
          password: argResults['keystore-password'],
  
negative.code:   }
  
    Map<String, File> extraFiles = <String, File>{};
    if (FileSystemEntity.isDirectorySync(_kDefaultAssetsPath)) {
      Directory assetsDir = new Directory(_kDefaultAssetsPath);
      for (FileSystemEntity entity in assetsDir.listSync(recursive: true)) {
  