gulp task for bundling with browserify

gistfile1.js

gulp.task('bundle', function () {
  watchify.args.debug = true;
  //watchify.args.ignoreMissing = true;
  var bundler = watchify(browserify('./main.js', watchify.args));

  bundler.on('update', rebundle);

  function rebundle() {
    return bundler.bundle()
      //.pipe(exorcist(__dirname + '/dist/bundle.js.map'))
      // log errors if they happen
      .on('error', gutil.log.bind(gutil, 'Browserify Error'))
      .pipe(source('bundle.js'))
      .pipe(gulp.dest('./dist'));
  }

  return rebundle();
});