-signature">to<wbr/>Key<wbr/>Set</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="Set.html" class="tsd-signature-type tsd-kind-class">Set</a><span class="tsd-signature-symbol">&lt;</span><a class="tsd-signature-type tsd-kind-type-parameter" href="Map.html#constructor.new_Map.K-1">K</a><span class="tsd-signature-symbol">&gt;</span><a href="#toKeySet.toKeySet-1" aria-label="Permalink" class="tsd-anchor-icon"><svg v