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by rk06 3531 days ago
>But, TypeScript is optional in [..] Angular2,

typescript is not optional. Just look at the official docs. the js version of docs are still incompelte even though 2.1 has been released.

>it's true that Google uses/develops Angular2

Google's major product is adwords. And adwords is built on angular2 dart version. While devs mostly use ts version.