title: How do I fix the TypeScript error: TS2234: All declarations of an interface must have identical type parameters
body: <p>In typescript v0.9.5 this code compiled. </p>
  
  <pre><code>interface Array {
      indexOfField : (propertyName: string, value: any) =&gt; number;
   }
  </code></pre>
  
  <p>After upgrading to typescript 1.0, I get the following error: </p>
  
  <p>(2,11): error TS2234: All declarations of an interface must have identical type parameters.</p>
  
  <p>Line number 2:11 is the keyword Array.</p>
  
  <p>How do I fix this? </p>