diff --git a/pkg/frontend_server/lib/frontend_server.dart b/pkg/frontend_server/lib/frontend_server.dart
index 21d82f5a1b3..136b9ab3cbf 100644
--- a/pkg/frontend_server/lib/frontend_server.dart
+++ b/pkg/frontend_server/lib/frontend_server.dart
@@ -36,6 +36,8 @@ import 'package:vm/kernel_front_end.dart';
 import 'src/javascript_bundle.dart';
 import 'src/strong_components.dart';
 
+export 'src/to_string_transformer.dart';
+
 ArgParser argParser = ArgParser(allowTrailingOptions: true)
   ..addFlag('train',
       help: 'Run through sample command line to produce snapshot',