code: function () {
      // paths.admin.js_watch.forEach(fs.statSync);
      return gulp.src(paths.admin.js_watch)
        .pipe(gulpif(!production, sourcemaps.init()))
        .on('error', handleError('JS'))
        .pipe(concat('index.min.js'))
        .pipe(gulpif(production, uglify({preserveComments: 'license', mangle: false})))
        .pipe(sourcemaps.write())
        .pipe(gulp.dest(paths.admin.build + 'js/'));
    }
docs: /*
  Concatenate js