;&amp; (url is String || url == null)) {
    return _blink.BlinkNavigator.instance.sendBeacon_Callback_2_(unwrap_jso(this), url, unwrap_jso(data));
  }
  if ((data is Blob || data == null) &amp;&amp; (url is String || url == null)) {
    return _blink.BlinkNavigator.instance.sendBeacon_Callback_2_(unwrap_jso(this), url, unwrap_jso(data));
  }
  throw new ArgumentError(&quot;Incorrect number or type of arguments&quot;);
}</code></pre>
    </section>

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