/**
 * Deterministic bounded drift detection.
 *
 * Detectors are deterministic and bounded; drift never automatically changes
 * the active policy. Drift generates evaluation recommendations. Safety drift
 * is high priority. Minimum sample counts are enforced and no unsupported
 * statistical certainty is claimed.
 */
import type { DriftConfig, DriftResult } from "./types.js";
export type DriftDimension = "quality" | "cost" | "latency" | "failure_cluster" | "retrieval" | "task_distribution" | "flakiness" | "policy_selection";
declare const DEFAULT_CONFIG: Record<DriftDimension, DriftConfig>;
export interface DriftHealth {
    ok: boolean;
    reasons: string[];
}
/** Check drift detector health (read-only). */
export declare function checkDriftHealth(): DriftHealth;
/**
 * Record a sample for a dimension and detect drift over the trailing window.
 * Compares the last half of the window against the first half using a simple
 * deterministic mean-delta detector (documented as such).
 */
export declare function detectDrift(dimension: DriftDimension, value: number, config?: Partial<DriftConfig>): DriftResult;
/**
 * Pure deterministic drift computation over an explicit sample window. This is
 * the unit of testing: it never reads persistent storage, so results are fully
 * reproducible and do not depend on previously recorded samples.
 */
export declare function computeDrift(dimension: DriftDimension, samples: {
    t: number;
    v: number;
}[], config?: Partial<DriftConfig>): DriftResult;
export { DEFAULT_CONFIG as DRIFT_DEFAULT_CONFIG };
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