export declare class ReferenceCountedSet<T> {
    private map;
    constructor();
    add: (key: T) => void;
    remove: (key: T) => void;
    has: (key: T) => boolean;
    get size(): number;
    [Symbol.iterator](): Generator<T, void, unknown>;
}
//# sourceMappingURL=data-structures.d.ts.map