Use browserify.

package.json

@@ -9,7 +9,7 @@
       "email": "me@noraesae.net"
     }
   ],
-  "main": "src/perfect-scrollbar.js",
+  "main": "out/js/perfect-scrollbar.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/noraesae/perfect-scrollbar"
@@ -26,13 +26,15 @@
     "node": ">= 0.8.0"
   },
   "devDependencies": {
+    "browserify": "^8.1.1",
     "gulp": "^3.8.10",
     "gulp-bump": "^0.1.11",
     "gulp-jshint": "^1.9.0",
     "gulp-rename": "^1.2.0",
     "gulp-rimraf": "^0.1.1",
     "gulp-sass": "^1.3.1",
-    "gulp-uglify": "^1.0.2"
+    "gulp-uglify": "^1.0.2",
+    "vinyl-transform": "^1.0.0"
   },
   "scripts": {
     "test": "gulp"