Gulp critical css snippet

critical-for-jekyll-site.js

criticalOpts: {
        base: paths.dest,
        css: [paths.dest + 'css/styles.css'],  // multiple stylesheets concatenated 
        minify: true,
        
    }
        
     // htmldir.in = '_site/**/*.html';
     // gulp-concat combines all files from multiple pages into one
     // nano purges redundant code and minifies. 

gulp.task('critical', function () {
    return gulp.src(paths.htmldir.in)
        .pipe(critical(paths.cssdir.criticalOpts))
        .pipe(concat('critical.css'))
        .pipe(nano())
        .pipe(gulp.dest(paths.includeDir))
});