/**
 * Aggregation functions for combining scores across multiple trials.
 *
 * Aggregators are functions that return a serializable config plus an `aggregate` function.
 * The config is stored on spans for UI display, while the function performs the actual computation.
 */
/**
 * Base type for aggregation configuration.
 * Contains a `type` identifier and an `aggregate` function for computing the final score.
 */
type Aggregation<T extends string = string> = {
    type: T;
    threshold?: number;
    aggregate: (scores: number[]) => number;
};
/**
 * Computes the arithmetic mean of all trial scores.
 *
 * @example
 * ```typescript
 * Scorer('accuracy', fn, { aggregation: Mean() })
 * // scores [0.8, 0.6, 0.7] => 0.7
 * ```
 */
declare const Mean: () => Aggregation<"mean">;
/**
 * Computes the median of all trial scores.
 *
 * @example
 * ```typescript
 * Scorer('latency', fn, { aggregation: Median() })
 * // scores [0.3, 0.9, 0.5] => 0.5
 * ```
 */
declare const Median: () => Aggregation<"median">;
/**
 * Returns 1 if at least one trial score meets or exceeds the threshold, 0 otherwise.
 * Also known as "pass@k" in evaluation literature.
 *
 * @param opts.threshold - The minimum score required for a trial to pass
 *
 * @example
 * ```typescript
 * Scorer('tool-called', fn, { aggregation: PassAtK({ threshold: 0.8 }) })
 * // scores [0.5, 0.9, 0.6] => 1 (0.9 >= 0.8)
 * // scores [0.5, 0.6, 0.7] => 0 (none >= 0.8)
 * ```
 */
declare const PassAtK: (opts?: {
    threshold?: number;
}) => Aggregation<"pass@k">;
/**
 * Returns 1 if all trial scores meet or exceed the threshold, 0 otherwise.
 * Also known as "pass^k" in evaluation literature.
 *
 * @param opts.threshold - The minimum score required for all trials to pass
 *
 * @example
 * ```typescript
 * Scorer('consistency', fn, { aggregation: PassHatK({ threshold: 0.9 }) })
 * // scores [0.95, 0.92, 0.91] => 1 (all >= 0.9)
 * // scores [0.95, 0.85, 0.91] => 0 (0.85 < 0.9)
 * ```
 */
declare const PassHatK: (opts?: {
    threshold?: number;
}) => Aggregation<"pass^k">;
/**
 * User-friendly alias for PassAtK.
 * Returns 1 if at least one trial passes, 0 otherwise.
 *
 * @example
 * ```typescript
 * Scorer('tool-called', fn, { aggregation: AtLeastOneTrialPasses({ threshold: 0.8 }) })
 * ```
 */
declare const AtLeastOneTrialPasses: (opts?: {
    threshold?: number;
}) => Aggregation<"pass@k">;
/**
 * User-friendly alias for PassHatK.
 * Returns 1 if all trials pass, 0 otherwise.
 *
 * @example
 * ```typescript
 * Scorer('consistency', fn, { aggregation: AllTrialsPass({ threshold: 0.9 }) })
 * ```
 */
declare const AllTrialsPass: (opts?: {
    threshold?: number;
}) => Aggregation<"pass^k">;

export { type Aggregation, AllTrialsPass, AtLeastOneTrialPasses, Mean, Median, PassAtK, PassHatK };