- Get the TypeScript tools: http://www.microsoft.com/en-us/download/details.aspx?id=34790
- Install Web Essentials http://visualstudiogallery.msdn.microsoft.com/6ed4c78f-a23e-49ad-b5fd-369af0c2107f
- In Visual Studio go to Options => Web Essentials => TypeScript
Happy scripting.