"skippedContentGlobs" doesn't seem to work on Gulp plugin

[stefanobartoletti]

I'm trying to prevent some files from being scanned by gulp-purgecss, but it does not seem to recognize the skippedContentGlobs option.

This is the relevant configuration on my Gulp tasks:

    .pipe(purgecss({
      content: [ './**/*.php', './src/js/**/*.js' ],
      skippedContentGlobs: [ 'node_modules/**', 'components/**', 'pattern-library.php' ],
      safelist: [ /^carousel-item.*/, /collapsing/, /show/ ]
    }))

but it doesn't work, since the final CSS bundle still contains classes from pattern-library.php.

Am I doing something wrong? How can I correctly configure purgecss to exclude specific files?