How to set the formatting style of the final file in PostCSS?

Question

Preprocessors

In sass, it is possible to set the formatting style of the final file using the outputStyle option, which can accept nested, compact, expanded, compressed
How to do something similar in PostCSS, and more specifically the expanded style?

gulp.task('css', function() {
  gulp.src(source + 'style.css')
  .pipe(sourcemaps.init())
  .pipe(postcss([
    postcssPartialImport({prefix: '_', extension: '.css'}),
    postcssPresetEnv({
      autoprefixer: {
        browsers: [
          "> 1%",
          "last 2 versions",
          "Android >= 4", 
          "Firefox >= 20", 
          "iOS >= 8"
        ]
      },
      features: {
        'nesting-rules': true,
        'color-mod-function': true,
        'custom-selectors': true,
        'custom-media-queries': true
      }      
    })
  ]))
  .on('error', gutil.log)
  .pipe(sourcemaps.write('.'))
  .pipe(gulp.dest(dest + 'css'));
});

Answer 1

In general, I solved the problem with the stylefmt plugin , in particular for my case gulp-stylefmt , it seems to be recommended on the official page with plugins