e-symbol">&lt;</span
                  ><span class="tsd-signature-type">string</span
                  ><span class="tsd-signature-symbol">, </span
                  ><span class="tsd-signature-type">undefined</span
                  ><span class="tsd-signature-symbol"> | </span
                  ><span class="tsd-signature-type">string</span
                  ><span class="tsd-signature-symbol">&gt;</span
                  ><span class="tsd-signature-symbol">)</span
                  ><span class="tsd-sig