naryCallbackHandler-param-f"><span class="type-annotation">R</span> <span class="parameter-name">f</span>(<span class="parameter" id="param-arg"><span class="type-annotation">T</span> <span class="parameter-name">arg</span></span>)</span>)
    </section>

        <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">typedef RegisterUnaryCallbackHandler = ZoneUnaryCallback&lt;R, T&gt; Function&lt;R, T&gt;(
   