/**
 * Calculates the similarity between two strings as a percentage
 * Uses Levenshtein distance normalized by the length of the longer string
 * @param str1 - First string to compare
 * @param str2 - Second string to compare
 * @returns Similarity score between 0 (completely different) and 1 (identical)
 */
export declare const stringSimilarity: (string1: string, string2: string) => number;