meter">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-name">onCancel</span>(<span class="parameter" id="onCancel-param-subscription"><span class="type-annotation"><a href="dart-async/StreamSubscription-class.html">StreamSubscription</a><span class="signature">&lt;<wbr><span class="type-parameter">T</span>&gt;</span></span> <span class="p