How to minify libraries in Gulp 4?

Question

gulp.js

Hello. Tell me please.

In gulp 4, I have libraries (libs.min.css, libs.min.js) and scripts (scripts.min.css, scripts.min.js) in separate files. But when minifying libraries, I need them to go one after another with comments, here is an example: And

now it turns out like this Here is my code

function libsCss() {
  return src(paths.styles.srcLibs)
    .pipe(eval(preprocessor)())
    .pipe(concat(paths.cssLibsOutputName))
    .pipe(autoprefixer({
      overrideBrowserslist: ['last 10 versions'],
      grid: true
    }))
    .pipe(cleancss({
      level: {
        1: {
          specialComments: 'all'
        }
      },
      /*format: 'beautify' */
    }))
    .pipe(dest(paths.styles.dest))
    .pipe(browserSync.stream())
}