export declare class BigSet<T> implements Iterable<T> {
    _sets: Array<Set<T>>;
    get [Symbol.toStringTag](): string;
    get size(): number;
    [Symbol.iterator](): IterableIterator<T>;
    add(value: T): void;
    has(value: T): boolean;
    delete(value: T): boolean;
    clear(): void;
    values(): IterableIterator<T>;
}