Cannot compile TypeScript files in Visual Studio 2012

Question

I downloaded and installed TypeScript extension for VS 2012, I got my first sample compiles by manually dragging the ts file onto the tsc.exe file! because

Answer 1

Please check if you have invalid TypeScript. There are some TypeScript errors that don't show up in the Error List, but they prevent TypeScript Compile-On-Save and show a Output generation failed message in the Visual Studio status bar.

These are the TypeScript errors that can cause this:

• exporting a class which is not inside of a module (v 0.9.5).

Please let me know if there are more such errors, I'll add them here.