title: tslint error Shadowed name: 'Observable'
body: <p>I am getting the following error when running tslint that I wasn't getting before..</p>
  
  <pre><code>ERROR: C:/...path..to../observable-debug-operator.ts[27, 13]: Shadowed name: 'Observable'
  </code></pre>
  
  <p>I followed this <a href="https://blog.angular-university.io/debug-rxjs/" rel="noreferrer">tutorial</a> for adding a debug operator to Observable and it is working fine except I am getting this lint error. I had been using this debug operator for a while without getting the lint error and I'm not sure why I am getting it now.</p>
  
  <p>Here is the code at line 27 to amend the type definition with the debug method</p>
  
  <pre><code>declare module 'rxjs/Observable' {
    interface Observable&lt;T&gt; { // line 27
      debug: (...any) =&gt; Observable&lt;T&gt;;
    }
  }
  </code></pre>
  
  <p>Does anyone know how I can clear this lint error? Thank you!</p>