'gulp task sample' throws error on CSS due to angularFilesort #8

The gulpfile.js generated, crashes on gulp serve, if the src contains some style.css.
The error is

events.js:160
throw er; // Unhandled 'error' event
^
Error: Error in parsing: "style.css", Line 1: Unexpected token .

I found that following line in the sample task is the culprit,

var files = gulp.src(['src/**/*.js', 'src/**/*.css', 'src/**/*.less', '.tmp/dist/*.js'])
                  .pipe($.if('*.js', $.angularFilesort()));

It invokes $.angular even on CSS.
This exists even if published widgets like adf-widget-clock
I have made following change and it works.

  var files = gulp.src(['src/**/*.js', '.tmp/dist/*.js'])
                  .pipe($.if('*.js', $.angularFilesort()));

  files.push(gulp.src(['src/**/*.css', 'src/**/*.less']));

Hope this post helps for rectification and someone facing the same issue.