type-parameter">E</span>&gt;</span><span class="signature">(<wbr><span class="parameter" id="asyncExpand-param-convert"><span class="type-annotation"><a href="dart-async/Stream-class.html">Stream</a><span class="signature">&lt;<wbr><span class="type-parameter">E</span>&gt;</span></span> <span class="parameter-name">convert</span>(<span class="parameter" id="convert-param-event"><span class="type-annotation">T</span> <span class="parameter-name">event</span></span>)</span>)
            <span class="returntyp