/**
 * Small closest-match helper used to power "Did you mean …?" quick fixes.
 *
 * Implements an iterative Levenshtein edit distance and a conservative
 * suggestion threshold so that only genuinely close typos are offered.
 */
/**
 * Compute the Levenshtein edit distance between two strings.
 * @param a - First string.
 * @param b - Second string.
 * @returns The minimum number of single-character edits to turn `a` into `b`.
 */
export declare function levenshtein(a: string, b: string): number;
/**
 * Return the candidate closest to `word` (case-insensitive) when it is within a
 * conservative typo threshold, or null when nothing is close enough.
 *
 * The threshold scales with the word length: very short words allow at most one
 * edit, longer words up to two. This avoids suggesting unrelated names.
 * @param word - The unknown word typed by the user.
 * @param candidates - Known valid names to match against.
 * @returns The closest candidate (in its original casing), or null.
 */
export declare function closestMatch(word: string, candidates: Iterable<string>): string | null;
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