/**
 * Thin Gate adapter — exposes delta-threshold-on-holdout as a composable
 * `Gate`. Use when you want held-out as one of N composed gates instead of
 * the full `defaultProductionGate` stack.
 */
import type { Gate, Scenario } from '../types';
export interface HeldOutGateOptions<TScenario extends Scenario = Scenario> {
    scenarios: TScenario[];
    deltaThreshold?: number;
}
export declare function heldOutGate<TArtifact, TScenario extends Scenario>(options: HeldOutGateOptions<TScenario>): Gate<TArtifact, TScenario>;
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