GitHub is currently shipping ES2019-compatible code, and will soon ship ES2020 code.
Wow, won’t that exclude a whole bunch of browsers? No. Looking at the data, the majority of their visitors use the latest version of a browser, or the version before that (wow!).
This shows us that the promise of evergreen browsers is here today. The days of targeting one specific version of one browser are long gone. […] With that said, we still need to ensure some compatibility for user agents, which do not fall into the neat box of evergreen browsers. Universal access is important, and 1% of 73 million users is still 730,000 users.
To cater for older browsers they include some polyfills to plug the holes, but that’s not really needed:/p>
Yes, a thousand times YES!