scription</a><span class="signature">&lt;T&gt;</span></span>
      <span class="name ">listen</span>
(<wbr><span class="parameter" id="listen-param-onData"><span class="type-annotation">void</span> <span class="parameter-name">onData</span>(<span class="parameter" id="onData-param-event"><span class="type-annotation">T</span> <span class="parameter-name">event</span></span>), {</span> <span class="parameter" id="listen-param-onError"><span class="type-annotation"><a href="dart-core/Function-class.html">Func