 id="asBroadcastStream-param-onListen"><span class="type-annotation">void</span> <span class="parameter-name">onListen</span>(<span class="parameter" id="onListen-param-subscription"><span class="type-annotation">StreamSubscription<span class="signature">&lt;<wbr><span class="type-parameter">T</span>&gt;</span></span> <span class="parameter-name">subscription</span></span>), </span> <span class="parameter" id="asBroadcastStream-param-onCancel"><span class="type-annotation">void</span> <span class="parameter