title: VSTS Specified TypeScript compiler not found
body: <p>I am using VSTS for a project that is using TypeScript. We have a CI Build configured and suddenly that one stopped working today. Yesterday all was fine, today they are all failing.</p>
  
  <p>Looking into the build logs I discovered that it's not finding the TypeScript compiler that we specified:</p>
  
  <blockquote>
    <p>Warning : Your project specifies TypeScriptToolsVersion 2.1, but a matching compiler was not found. The latest available TypeScript compiler will be used (2.4). To remove this warning, install the TypeScript 2.1 SDK or update the value of TypeScriptToolsVersion.</p>
  </blockquote>
  
  <p>So all of a sudden it starts compiling with TypeScript 2.4 and we have some code that's not compatible with that version (Promises).</p>
  
  <p>I have defined the TypeScript Tools Version in our .csproj as</p>
  
  <pre><code>&lt;TypeScriptToolsVersion&gt;2.1&lt;/TypeScriptToolsVersion&gt;
  </code></pre>
  
  <p>and that seems to be working as I read in the build logs that it tried using that one first.</p>
  
  <p>Any idea what caused VSTS suddenly to "forget" about TypeScript 2.1 and how I can fix this? I could not find any update notification or anything.</p>