save mhtml in playwright

save-mhtml.js

const { chromium } = require('playwright');
const fs = require('node:fs/promises');
(async () => {
  const browser = await chromium.launch();
  const context = await browser.newContext();
  const page = await context.newPage();
  await page.goto('https://playwright.dev/');
  const session = await context.newCDPSession(page)
  const {data:mhtmlData} = await session.send('Page.captureSnapshot')
  await fs.writeFile('./mynewmhtml.mhtml', mhtmlData)
  await browser.close();
})();