diff --git a/gulpfile.js b/gulpfile.js
index 421d97c..ed5bb60 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -31,4 +31,4 @@ const watchTask = function () {
   watch('src/*', script);
 };
 
-exports.default = parallel(cleanTask, copy, script, watchTask);
+exports.default = parallel(copy, script, watchTask);
diff --git a/src/message.js b/src/message.js
new file mode 100644
index 0000000..f32097e
--- /dev/null
+++ b/src/message.js
@@ -0,0 +1,7 @@
+window.addEventListener(
+  'message',
+  function (event) {
+    console.log('event: ', event);
+  },
+  false,
+);