I\'ve just read some advertisement information related to TypeScript and besides that I have no experience with this superset of JavaScript. So I have some basic questions:<
Trying to design a web browser that could natively support more than one language at a time is exactly what Google tried to do with Dart. There was a Dart engine planned for Chrome but this ended up being too big a task with very little benefit aside from "just not using java script".
I suspect supporting Typescript natively would be an equally daunting task. Probably better to just improve upon ECMAScript and add in a few TS ideas where they make sense. I do love TS though.