="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-developer/ServiceExtensionResponse-class.html">ServiceExtensionResponse</a></span>&gt;</span></span>
                <span class="name ">ServiceExtensionHandler</span>
(<wbr><span class="parameter" id="ServiceExtensionHandler-param-method"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">method</span>, </span> <span class="par