<section class="tsd-panel tsd-member"><a id="once" class="tsd-anchor"></a>
<h3 class="tsd-anchor-link"><span>once</span><a href="#once" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="#icon-anchor"></use></svg></a></h3>
<div class="tsd-signature"><span class="tsd-kind-property">once</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">event</span>, <span class="tsd-kind-parameter">handler</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> => </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></div>
<section class="tsd-panel tsd-member"><a id="once" class="tsd-anchor"></a>
<h3 class="tsd-anchor-link"><span>once</span><a href="#once" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="#icon-anchor"></use></svg></a></h3>
<div class="tsd-signature"><span class="tsd-kind-property">once</span><span class="tsd-signature-symbol">:</span> <span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">(</span><span class="tsd-kind-parameter">event</span>, <span class="tsd-kind-parameter">handler</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol"> => </span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">)</span></div>