interface IEquality {
    equals(other: any): boolean;
}
export declare class BagMap<K extends IEquality, V> {
    private pairs;
    set(key: K, value: V): void;
    has(key: K): boolean;
    get(key: K): V | undefined;
    entries(): Generator<[K, V], void, unknown>;
}
export declare function difference<A>(s1: Set<A>, s2: Set<A>): Set<A>;
export declare function union<A>(s1: Set<A>, s2: Set<A>): Set<A>;
export declare function intersect<A>(s1: Set<A>, s2: Set<A>): Set<A>;
export {};