import type { PrototypeStruct } from '../index.js';
export declare function utilIsSet<T>(x: any): x is Set<T>;
interface IsSet {
    isSet(x: any): boolean;
}
export declare const isSet: PrototypeStruct;
declare global {
    interface SetConstructor extends IsSet {
    }
}
export {};
//# sourceMappingURL=is-set.d.ts.map