otation">R</span> <span class="parameter-name">f</span>(<ol class="parameter-list"><li><span class="parameter" id="param-arg"><span class="type-annotation">T</span> <span class="parameter-name">arg</span></span></li>
</ol>
)</span></li>
</ol>)
      
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">ZoneUnaryCallback&lt;R, T&gt; registerUnaryCallback&lt;R, T&gt;(Zone zone, R f(T ar