title: Strict mode forbids implicit creation of global property 'inferred'
body: <p>I keep getting the following error when i build </p>
  
  <p>Karma Run Failed: undefined</p>
  
  <pre><code>ERROR [karma]: ReferenceError: Strict mode forbids implicit creation of global property 'inferred'
  at undefined:9
  </code></pre>
  
  <p>It does not tell me where it occurs or which property it just refers to inferred.</p>