deprecate usage of JSDOM

[thescientist13]

Type of Change

• New Feature Request
• Documentation / Website
• Improvement / Suggestion
• Bug
• Other (please clarify below)

Summary

In regards to a comment here just questioning usage of JSDOM

Details

Will make an issue for it specifically, but have been wondering if there's a way we can remove our dependency on JSDOM? In particular in browser.js it seems clunky to get the content from puppeteer (a real browser) but then just pass it back into a "fake" browser.

const browser = await puppeteer.launch({
  headless: true,
  args: ['--no-sandbox']
});
const renderer = new Renderer(browser);
const result = await renderer.serialize(url);

// need url: https://github.com/jsdom/jsdom/issues/2005
const dom = new JSDOM(result.content, { url });
const html = dom.serialize();
const target = path.join(outputDirectory, route);

I could see how JSDOM could be helpful for unit testing, so maybe we just need to make it a devDependency or just get some sort of simple DOM parsing library? Just seems like a lot to have both Puppeteer and JSDOM.