 <p>I'm not sure this is your case or not, but there are some issues regarding with .ts file encoding.</p> <p>Unfortunately TypeScript cannot compile UTF-8 <strong>with</strong> signature. You might choose another save option by "FILE"-->"Advanced Save Options"--> Select "UTF-8 without signature".</p> <p>Check current issue. <a href="http://typescript.codeplex.com/workitem/85" rel="nofollow">http://typescript.codeplex.com/workitem/85</a></p> <p>Thanks</p>