title: Getting clientHeight from a react-reason DOM ref
body: <p>I'm accessing a <code>reason-react</code> DOM reference in order to ascertain client height.</p>
  
  <p>Unfortunately <code>clientHeight</code> doesn't seem to be part of the <code>ref</code> API. So this fails:</p>
  
  <pre class="lang-ml prettyprint-override"><code>ref
    -&gt; React.Ref.current
    -&gt; Js.Nullable.toOption
    -&gt; Belt.Option.map(this =&gt; {
      React.Ref.clientHeight(this);
  });
  </code></pre>
  
  <p><code>The value clientHeight can't be found in React.Ref</code>.</p>
  
  <p>Is there a way to extract the height of a component from the ref?</p>
  
  <p>The ref was acquired from a div.</p>