message test

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);

src/message.js

@@ -0,0 +1,7 @@
+window.addEventListener(
+  'message',
+  function (event) {
+    console.log('event: ', event);
+  },
+  false,
+);