span class="type-annotation"><a href="dart-async/ErrorCallbackHandler.html">ErrorCallbackHandler</a></span> <span class="parameter-name">errorCallback</span>, </span> <span class="parameter" id="-param-scheduleMicrotask"><span class="type-annotation"><a href="dart-async/ScheduleMicrotaskHandler.html">ScheduleMicrotaskHandler</a></span> <span class="parameter-name">scheduleMicrotask</span>, </span> <span class="parameter" id="-param-createTimer"><span class="type-annotation"><a href="dart-async/CreateTimerHa