export declare class SetUtils {
    static union<T extends string | number>(set0: Set<T>, set1: Set<T>): Set<T>;
    static intersection<T extends string | number>(set0: Set<T>, set1: Set<T>): Set<T>;
    static difference<T extends string | number>(set0: Set<T>, set1: Set<T>): Set<T>;
}
