diff --git a/js/commonjs/export.js b/js/commonjs/export.js
new file mode 100644
index 0000000..a93ee92
--- /dev/null
+++ b/js/commonjs/export.js
@@ -0,0 +1,31 @@
+/**
+ * @fileoverview Export symbols needed by generated code in CommonJS style.
+ *
+ * This effectively is our canonical list of what we publicly export from
+ * the google-protobuf.js file that we build at distribution time.
+ */
+
+// Include a dummy provide statement so that closurebuilder.py does not skip over this
+// file.
+goog.provide('jspb.Export');
+
+goog.require('goog.object');
+goog.require('jspb.BinaryReader');
+goog.require('jspb.BinaryWriter');
+goog.require('jspb.ExtensionFieldBinaryInfo');
+goog.require('jspb.ExtensionFieldInfo');
+goog.require('jspb.Message');
+goog.require('jspb.Map');
+
+exports.Map = jspb.Map;
+exports.Message = jspb.Message;
+exports.BinaryReader = jspb.BinaryReader;
+exports.BinaryWriter = jspb.BinaryWriter;
+exports.ExtensionFieldInfo = jspb.ExtensionFieldInfo;
+exports.ExtensionFieldBinaryInfo = jspb.ExtensionFieldBinaryInfo;
+
+// These are used by generated code but should not be used directly by clients.
+exports.exportSymbol = goog.exportSymbol;
+exports.inherits = goog.inherits;
+exports.object = {extend: goog.object.extend};
+exports.typeOf = goog.typeOf;