title: Angular: "Unexpected token. A constructor, method, accessor or property was expected"
body: <p>I wonder why I get this compile error if I declare variable with <code>var</code> or <code>let</code> keywords? I mean, this goes well:</p>
  
  <pre><code>export class AppComponent {
  
      refreshClickStream$: any;
  
      constructor(){
      }
  </code></pre>
  
  <p>While this brings the error:</p>
  
  <pre><code>export class AppComponent {
  
      var refreshClickStream$: any;
  
      constructor(){
      }
  </code></pre>