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