/**
 * probabilistic set for fast rejection of unrelated PRs
 *
 * 0(1) lookup
 * false positives allowed
 * false negatives forbidden
 */
export declare class BloomFilter {
    private bits;
    private size;
    private hashes;
    constructor(size?: number, hashes?: number);
    private hash;
    /**
     * inserts a value into the filter
     */
    add(value: string): void;
    /**
     * returns false only if value is definitely not present
     */
    mightContain(value: string): boolean;
    /**
     * Export filter state as base64 string
     */
    export(): string;
    /**
     * Import filter state from base64 string
     */
    import(data: string): void;
}
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