export interface SimilarityCacheStats {
    distance: number;
    ratio: number;
    sequence: number;
}
export declare class Levenshtein {
    /**
     * Returns a normalized Levenshtein similarity ratio.
     */
    static ratio(seq1: string, seq2: string): number;
    /**
     * Returns the exact Levenshtein edit distance.
     */
    static distance(seq1: string, seq2: string): number;
}
/**
 * Normalized Levenshtein similarity helper for deduplication.
 */
export declare function levenshteinSimilarity(cand1: string, cand2: string): number;
/**
 * Sequence-style similarity used to approximate upstream YAKE's `seqm` dedup behavior.
 */
export declare function sequenceSimilarity(cand1: string, cand2: string): number;
/**
 * Jaro similarity helper.
 */
export declare function jaroSimilarity(first: string, second: string): number;
/**
 * Returns current sizes of the bounded similarity caches.
 */
export declare function getSimilarityCacheStats(): SimilarityCacheStats;
/**
 * Clears all bounded similarity caches.
 */
export declare function clearSimilarityCaches(): void;
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