use jsdom to prerender simple page.

jsdom-prerender.js

const jsdom = require("jsdom");
const { JSDOM } = jsdom;
const path = require('path')
const fetch = require('node-fetch')
const finalhandler = require('finalhandler')
const http = require('http')
const serveStatic = require('serve-static')

function createServer (port, root = path.join(__dirname, 'dist')) {
  const serve = serveStatic(root)
  const server = http.createServer((req, res) => {
    serve(req, res, finalhandler(req, res))
  })
  server.listen(port)
  return server
}

module.exports = async () => {
  const port = process.env.PORT || 3333
  const host = `http://localhost:${port}`
  const server = createServer(port)
  const { promise, resolve } = new function () {
    this.promise = new Promise((resolve) => {
      this.resolve = resolve
    })
  }
  const virtualConsole = new jsdom.VirtualConsole();
  virtualConsole.on('error', (...e) => { console.error(...e) })
  const buildTime = function () {
    var d = new Date(TIME);
    console.log('build: ' + d.toLocaleDateString() + ' ' + d.toLocaleTimeString());
  }
  const dom = await JSDOM.fromURL(host, {
    runScripts: 'dangerously',
    resources: 'usable',
    virtualConsole,
    pretendToBeVisual: true,
    beforeParse(window) {
      window.fetch = window.fetch || ((url, option) => {
        return fetch(host + url, option)
      });
      window.__prerender = resolve
    }
  })
  await promise
  const doc = dom.window.document
  const injectScript = doc.createElement('script')
  injectScript.textContent = [
    `(${buildTime.toString().replace('TIME', Date.now()).replace(/\s{2,}/g, ' ')})()`
  ].join(';')
  doc.head.appendChild(injectScript)
  server.close()
  const html = dom.serialize()
  dom.window.close()
  return html
}

if (require.main === module) {
  console.log('Start prerendering...')
  module.exports().then((renderedHtml) => {
    console.log('Prerender done.', renderedHtml)
  }).catch(e => {
    console.error('prerender failed.', e)
  })
}

That's what I was hoping!! Brilliant. Wonderful.