iewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><div class="tsd-comment tsd-typography"><p>Produces a <a href="Set.html" class="tsd-kind-class">go.Set</a> that provides a read-only view onto the keys of this Map.
The collection of keys is not copied.</p>
</div><h4 class="tsd-returns-title">Returns <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-ki