title: What does the error "JSX element type '...' does not have any construct or call signatures" mean?
body: <p>I wrote some code:</p>
  
  <pre><code>function renderGreeting(Elem: React.Component&lt;any, any&gt;) {
      return &lt;span&gt;Hello, &lt;Elem /&gt;!&lt;/span&gt;;
  }
  </code></pre>
  
  <p>I'm getting an error:</p>
  
  <blockquote>
    <p>JSX element type <code>Elem</code> does not have any construct or call signatures</p>
  </blockquote>
  
  <p>What does it mean?</p>