text: import gulp from 'gulp'
  import packageFiles from 'package-files'
  import minifyCss from 'gulp-minify-css'
  import concat from 'gulp-concat'
  
  gulp.task('vendorCSS', vendorCSSTask)
  
  function vendorCSSTask() {
    const dependencies = packageFiles()
      .filter(dep => dep.endsWith('.css'))
  
    return gulp
      .src(dependencies)
      .pipe(concat('vendor.css'))
      .pipe(minifyCss())
      .pipe(gulp.dest('./public'))
  }
  