ameters</h4><ul class="tsd-parameters"><li><h5><span class="tsd-flag ts-flagOptional">Optional</span> operation: <span class="tsd-signature-type">string</span></h5></li></ul><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4></li></ul></section><section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited tsd-is-external"><a id="_signTypedData" class="tsd-anchor"></a><h3 class="tsd-anchor-link">_sign<wbr/>Typed<wbr/>Data<a href="#_signTypedDa