A couple of weeks ago google announced a long-awaited updated on googlebot. It now runs chrome engine version 74, the same we’re currently running in our Chromes. What’s more, it announced that from now on it will keep doing regular updates on it to ensure continued support for new web technologies.
It’s still missing support for some features, but different people reported their websites being crawled and rendered perfectly by google bot now. You can use ES6 syntax and many more things without the need to polyfill or apply babel!, at least not so heavily as if the website was from 2015.