diff --git a/packages/metro-bundler/react-packager/src/lib/JsonReporter.js b/packages/metro-bundler/react-packager/src/lib/JsonReporter.js
new file mode 100644
index 00000000..6d47bc0c
--- /dev/null
+++ b/packages/metro-bundler/react-packager/src/lib/JsonReporter.js
@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @flow
+ */
+
+'use strict';
+
+import {Writable} from 'stream';
+
+class JsonReporter<TEvent> {
+
+  _stream: Writable;
+
+  constructor(stream: Writable) {
+    this._stream = stream;
+  }
+
+  update(event: TEvent) {
+    this._stream.write(JSON.stringify(event) + '\n');
+  }
+
+}
+
+module.exports = JsonReporter;