title: React component export as PNG with a transparent background
body: <p>I'm trying to use <code>exportComponentAsPNG</code> function from <code>react-component-export-image</code> lib:
  <a href="https://www.npmjs.com/package/react-component-export-image" rel="nofollow noreferrer">https://www.npmjs.com/package/react-component-export-image</a></p>
  <p><code>exportComponentAsPNG(node, {fileName, html2CanvasOptions})</code></p>
  <p>The function works great if I pass just a component. But I can't make it work with optional <code>params</code> and produce an image with transparent background (maybe I'm missing something about optional parameters conversion of JS in general). So I tried to pass a <code>backgroundColor</code> option, which, I think, should help me with getting a transparent background. What I've already tried:</p>
  <ul>
  <li><code>exportComponentAsPNG(node, backgroundColor = null);</code></li>
  <li><code>exportComponentAsPNG(node, backgroundColor: null);</code></li>
  <li><code>exportComponentAsPNG(node, { backgroundColor: null });</code></li>
  </ul>
  <p>I could specify <code>backgroundColor</code> with the previous version of <code>react-component-export-image</code> API, but now I'm getting lost with the new syntax.</p>