--- a/tests/src/util/playgrounds/unique.ts
+++ b/tests/src/util/playgrounds/unique.ts
@@ -2772,8 +2772,6 @@
   }
 }
 
-export type UniqueHelperConstructor = new(...args: any[]) => UniqueHelper;
-
 // eslint-disable-next-line @typescript-eslint/naming-convention
 function ScheduledUniqueHelper<T extends UniqueHelperConstructor>(Base: T) {
   return class extends Base {