Use browserify.

gulpfile.js

@@ -1,11 +1,13 @@
 'use strict';
 
 var gulp = require('gulp')
+  , browserify = require('browserify')
   , bump = require('gulp-bump')
   , jshint = require('gulp-jshint')
   , rename = require('gulp-rename')
   , rimraf = require('gulp-rimraf')
   , sass = require('gulp-sass')
+  , transform = require('vinyl-transform')
   , uglify = require('gulp-uglify');
 
 gulp.task('lint', function () {
@@ -15,38 +17,59 @@ gulp.task('lint', function () {
 });
 
 gulp.task('clean:js', function () {
-  return gulp.src('./out/perfect-scrollbar.js', {read: false})
+  return gulp.src('./out/js/perfect-scrollbar.js', {read: false})
     .pipe(rimraf());
 });
 
-gulp.task('uglify', ['clean:js'], function () {
-  return gulp.src('./src/perfect-scrollbar.js')
+gulp.task('clean:js:min', function () {
+  return gulp.src('./out/js/perfect-scrollbar.min.js', {read: false})
+    .pipe(rimraf());
+});
+
+function browserified() {
+  return transform(function (filename) {
+    var b = browserify(filename);
+    return b.bundle();
+  });
+}
+
+gulp.task('js', ['clean:js'], function () {
+  return gulp.src('./src/js/main.js')
+    .pipe(browserified())
+    .pipe(rename('perfect-scrollbar.js'))
+    .pipe(gulp.dest('./out/js'));
+});
+
+gulp.task('js:min', ['clean:js:min'], function () {
+  return gulp.src('./src/js/main.js')
+    .pipe(browserified())
     .pipe(uglify())
     .pipe(rename('perfect-scrollbar.min.js'))
-    .pipe(gulp.dest('./out'));
+    .pipe(gulp.dest('./out/js'));
 });
 
 gulp.task('clean:css', function () {
-  return gulp.src('./out/perfect-scrollbar.css', {read: false})
+  return gulp.src('./out/css/perfect-scrollbar.css', {read: false})
+    .pipe(rimraf());
+});
+
+gulp.task('clean:css:min', function () {
+  return gulp.src('./out/css/perfect-scrollbar.min.css', {read: false})
     .pipe(rimraf());
 });
 
 gulp.task('sass', ['clean:css'], function () {
-  return gulp.src('./src/perfect-scrollbar.scss')
+  return gulp.src('./src/css/main.scss')
     .pipe(sass())
-    .pipe(gulp.dest('./out'));
-});
-
-gulp.task('clean:css:min', function () {
-  return gulp.src('./out/perfect-scrollbar.css', {read: false})
-    .pipe(rimraf());
+    .pipe(rename('perfect-scrollbar.css'))
+    .pipe(gulp.dest('./out/css'));
 });
 
 gulp.task('sass:min', ['clean:css:min'], function () {
-  return gulp.src('./src/perfect-scrollbar.scss')
+  return gulp.src('./src/css/main.scss')
     .pipe(sass({outputStyle: 'compressed'}))
     .pipe(rename('perfect-scrollbar.min.css'))
-    .pipe(gulp.dest('./out'));
+    .pipe(gulp.dest('./out/css'));
 });
 
 function bumpType() {
@@ -67,5 +90,5 @@ gulp.task('bump', function () {
 
 gulp.task('release', ['bump', 'build']);
 
-gulp.task('build', ['uglify', 'sass', 'sass:min']);
+gulp.task('build', ['js', 'js:min', 'sass', 'sass:min']);
 gulp.task('default', ['lint', 'build']);