rated dark hidden-l" id="sidebar-nav">
      <li><a href="index.html">flutter_midi_command</a></li>
      <li><a href="dart-async/dart-async-library.html">dart:async</a></li>
      <li class="self-crumb">RegisterCallbackHandler typedef</li>
    </ol>
    
    <h5>dart:async library</h5>
    <ol>
      <li class="section-title"><a href="dart-async/dart-async-library.html#classes">Classes</a></li>
      <li><a href="dart-async/Completer-class.html">Completer</a></li>
      <li><a class="deprecated" href="dart