span> <span style="white-space:nowrap">listener:<a class="type" title="haxe.Function - This type unifies with any function type." href="../../haxe/Function.html">Function</a>,</span> <span style="white-space:nowrap">?options:<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.AddEventListenerOptions" href="../../js/html/AddEventListenerOptions.html">AddEventL