It is open source software.
The TypeScript news currently has many comments on Hacker News:
Surprisingly, they even have info on how to use it with "other editors" like Vim, apart from Visual Studio.
A comment on HN say that Microsoft is now getting more open-source-friendly, due to newer people ("young turks" :) getting into management roles there. Good news if so.
Inspired by nature.
- dancingbison.com | @vasudevram | jugad2.blogspot.com