TypeScript

There actually is a TC39 proposal out there on adding type annotations. I think it'd be interesting just from the standpoint of we've seen them adopt other stuff, right? So like promises came out in the library and then they adopted as part of the language. But they didn't adopt kind of the tried and true way that the library worked in every case. And so I'm curious to see how similar it is to TypeScript and whether or not it would bring those aspects into JavaScript or not.