ptions:<a class="type" title="haxe.extern.EitherType - An abstract type allowing values to be either of T1 or T2 type." href="../../haxe/extern/EitherType.html">EitherType</a>&lt;<a class="type" title="js.html.EventListenerOptions" href="../../js/html/EventListenerOptions.html">EventListenerOptions</a>, <a class="type" title="Bool - The standard Boolean type, which can either be true or false." href="../../Bool.html">Bool</a>&gt;</span>):<a class="type" title="Void - The standard Void type." href="../../Voi