import type { EveEvalScorer } from "#evals/types.js";
/**
 * Scores 1 when `output` exactly equals `expected` (string comparison),
 * 0 otherwise. Returns `null` when expected is absent.
 */
export declare function exact(): EveEvalScorer;
/**
 * Scores 1 when `output` contains `expected` as a substring,
 * 0 otherwise. Returns `null` when expected is absent.
 */
export declare function includes(): EveEvalScorer;
/**
 * Scores by normalized character-level Levenshtein similarity
 * (1 = identical, 0 = entirely different). Use it for fuzzy comparison
 * when exact match is too strict but you do not want to call an LLM
 * judge or embedding model. Returns `null` when expected is absent.
 */
export declare function levenshtein(): EveEvalScorer;
