title: Visual Studio Team Services build Typescript error
body: <p>I have a angular2 webapplication where I'm using Typescript 2.0. I have install locally in my VS the version 2.0 and changed also the tag for the typescript version in my VS project. Locally vs build works fine. In my CD pipeline on Visual Studio Team Services with a vnext build now build fails with this:</p>
  
  <pre><code>2016-11-05T16:10:22.0371090Z   C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.8\tsc.exe --project "C:\a\1\s\src\Emersy\tsconfig.json"
  2016-11-05T16:10:22.7095466Z ##[error]VSTSC(0,0): Error TS5023: Build: Unknown compiler option 'strictNullChecks'.
  </code></pre>
  
  <p>Looks like that the build server is using the typesript version 1.8 is this possible?</p>