Recently, Google updated the mobile-friendly test and the rich results test to better support JavaScript sites. Google posted a Tweet saying that you will now see rendered HTML, console log, exceptions and slack traces.
In other words, those who build sites using JabaScript, AJAX and other types of JavaScript frameworks will be able to debug their sites better with these tools.
The following screen shot from Google shows how the mobile-friendly test tool renders JavaScript:
This test tool shows how easily it would be for a visitor to use your page on a mobile device. Although the rich results test shows you search results that go beyond the standard blue link, it’s possibly that they could include a carousel, image or non-textual user interface elements for your page.
Another announcement Google made was that they had a session at Google I/O named deliver search-friendly JavaScript-powered websites.