test build with headless browser

[brodybits]

such as Puppeteer or Playwright, ideally in CI testing

to avoid breaking the Babel build for browser targets

some resources from a quick search:

• https://github.com/ianwalter/playwright-container
• https://github.com/ianwalter/puppeteer-container
• https://www.infoworld.com/article/3584868/testing-web-applications-with-nodejs-and-playwright.html
• https://www.npmjs.com/package/playwright
• https://playwright.dev/