[soAsian]

Go to the link and read about it. It's not for web. It's a way for web dev to create WinStore/Metro apps.

Jesus f Christ! 100% of people commenting here don't even fucking bother to read what the fuck WinJs is about before shooting off their mouth.

[_pferreir_]

How does that invalidate parent's question? TypeScript compiles to JS. Couldn't MS have developed "WinTS" instead?

[reverius42]

Though I haven't checked, I would guess that WinJS has strongly-typed TypeScript bindings, for those who choose to use TypeScript. But releasing the library itself in JS makes it available to a wider audience and doesn't prevent it from being used in TypeScript.