docs: function bundleDevelopment() {
      const opts = assign({}, browersifyOptions, { debug: true });
      const bundler = browserify(opts).transform(babelify.configure(babelifyOptions));
      bundler.on('log', gutil.log); // output build logs to terminal
  
      return bundler.bundle()
      .on('error', (err) => { // log errors if they happen
          gutil.log('Browserify Error', err);
      })
      .pipe(source('crudl.js'))
      .pipe(gulp.dest(dist))
      .on('end', () => {
          gutil.log(`Successfully build ${gutil.colors.magenta(`${dist}/crudl.js`)}`)
      })
  }