How to use the @pluralsight/ps-design-system-build.fs.mkdir function in @pluralsight/ps-design-system-build

;(async _ => {
  await fs.mkdir('dist')

  const src = path.join('css', 'index.css')

  postcss.transform(src, path.join('dist', 'index.css'), [
    require('postcss-import'),
    require('postcss-cssnext')({ browsers: ['Last 2 versions', 'IE >= 11'] }),
    require('cssnano')
  ])
})()

const writeHtml = async (pageType, html) => {
  const outputDir = path.join(__dirname, '..', 'dist', 'html')
  await fs.mkdir(outputDir)
  const outputPath = path.join(outputDir, pageType + '.html')
  await fs.writeFile(outputPath, html)
}

;(async _ => {
  await fs.mkdir('dist')

  const src = path.join('css', 'index.css')
  postcss.transform(src, path.join('dist', 'index.css'), [
    postcssImport,
    postcss.postcssCssVarSelectors(postcssCssVarSelectorsOptions),
    autoprefixer(autoprefixerOptions)
  ])

  postcss.transform(src, path.join('dist', 'index.module.scss'), [
    postcssImport,
    postcss.postcssCssVarSassVar(),
    autoprefixer(autoprefixerOptions)
  ])
})()