export declare class SparseSet implements Iterable<number> {
    private indexToValue;
    private valueToIndex;
    get [Symbol.toStringTag](): string;
    [Symbol.iterator](): IterableIterator<number>;
    get size(): number;
    constructor(array?: number[]);
    values(): IterableIterator<number>;
    has(value: number): boolean;
    add(value: number): void;
    delete(value: number): boolean;
    clear(): void;
    clone(): SparseSet;
}