title: Argument of type 'NgElementConstructor<unknown>' is not assignable to parameter of type 'CustomElementConstructor'
body: <p>I'm getting a strange warning in VSCode( 1.44.0-insider ) with Angular9 in creating Angular Elements:</p>
  
  <pre><code>export class AppModule { 
    constructor(private injector: Injector) {
      const helloElement = createCustomElement(HelloComponent, {injector});
      customElements.define('my-hello', helloElement);
    }
    ngDoBootstrap() {}
  }
  </code></pre>
  
  <p>type of <code>helloElement</code> is not accepted with an error message from typescript: </p>
  
  <blockquote>
    <p>Argument of type 'NgElementConstructor' is not assignable to parameter of type 'CustomElementConstructor'</p>
  </blockquote>