ryHandler</a><span class="signature">&lt;R, T&gt;</span></span> <span class="parameter-name">runUnary</span>: <span class="default-value">null</span>, </span> <span class="parameter" id="from-param-runBinary"><span class="type-annotation"><a href="dart-async/RunBinaryHandler.html">RunBinaryHandler</a><span class="signature">&lt;R, T1, T2&gt;</span></span> <span class="parameter-name">runBinary</span>: <span class="default-value">null</span>, </span> <span class="parameter" id="from-param-registerCallback"><