I think TypeScript does a lot of things right.
A step in the right direction…
Still long ways to go…
But TypeScript being Microsoft’s baby, as you can imagine, currently the IDE that best supports it is only Visual Studio. However, the commercial, Windows only nature of Visual Studio wont do much to spread the language. There are plugins for TypeScript in other IDEs/editors like Webstorm and Sublime Text, but again they are not near the implementation of Visual Studio and suffer some of the same problems as Visual Studio (eg Webstorm is not free).
What is needed
- Cross Platform
- Is mainsteam itself
Currently Eclipse satisfies that criteria. However, the open source plugin available for it is not high quality enough. It would serve Microsoft well to create and fund a project with the Eclipse Foundation for TypeScript.