async function transformProdSsrPwaOfflineHtml (html, quasarConf) {
  html = html.replace(
    entryPointMarkup,
    attachMarkup
  )

  if (quasarConf.build.minify !== false) {
    html = await minify(html, quasarConf.build.htmlMinifyOptions)
  }

  return html
}
Used by production SSR only.
Gets index.html generated content as param.