Update gulpfile.js

Tools/Gulp/gulpfile.js

@@ -957,7 +957,7 @@ gulp.task("typedoc-all", function (cb) {
  * Validate compile the code and check the comments and style case convention through typedoc
  */
 gulp.task("typedoc-check", function (cb) {
-    runSequence("typescript-compile", "typedoc-generate", "typedoc-validate", cb);
+    runSequence("typescript-compile", "gui", "loaders", "serializers", "typedoc-generate", "typedoc-validate", cb);
 });
 
 /**