tation"><a href="dart-core/Function-class.html">Function</a></span> <span class="parameter-name">onError</span>, {</span> <span class="parameter" id="handleError-param-test"><span class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">test</span>(<span class="parameter" id="test-param-error"><span class="type-annotation">dynamic</span> <span class="parameter-name">error</span></span>)</span> })
            <span class="returntype parameter">&#8594; <a href="