Index: frontend/node_modules/is-set/index.d.ts
===================================================================
--- frontend/node_modules/is-set/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/is-set/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,3 @@
+declare function isSet<V = unknown>(x: unknown): x is Set<V>;
+
+export = isSet;