/**
 * String Similarity Utilities for UAM
 *
 * Shared text comparison functions used across memory compression,
 * deduplication, and retrieval systems.
 */
/**
 * Calculate Jaccard similarity between two strings (word-level)
 * Returns a value between 0 (no overlap) and 1 (identical)
 */
export declare function jaccardSimilarity(a: string, b: string): number;
/**
 * Calculate content hash for deduplication
 * Uses SHA-256 for reliable collision resistance
 */
export declare function contentHash(text: string): string;
/**
 * Improved token estimation
 * More accurate than simple length/4 for mixed code and prose
 */
export declare function estimateTokensAccurate(text: string): number;
/**
 * Simple stemming for keyword matching
 * Handles common English suffixes for better fuzzy matching
 */
export declare function simpleStem(word: string): string;
/**
 * Fuzzy keyword match using stemming
 * Returns true if any stemmed form matches
 */
export declare function fuzzyKeywordMatch(text: string, keyword: string): boolean;
/**
 * Calculate text similarity using multiple methods
 * Returns weighted average for more robust comparison
 */
export declare function textSimilarity(a: string, b: string): number;
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