n>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">Future&lt;PresentationAvailability&gt; getAvailability() =&gt;
    promiseToFuture&lt;PresentationAvailability&gt;(
        JS(&quot;&quot;, &quot;#.getAvailability()&quot;, this));</code></pre>
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