import { type HygieneCommonOptions } from "../shared.js";
export interface AuditFallbackDriftOptions extends HygieneCommonOptions {
    root?: string;
    /** Reference (source) language. Default `en`. */
    referenceLanguage?: string;
    /** Target language(s) to compare. */
    targetLanguages?: string[];
    /** Threshold (days) — flag items where target lags reference by this many days. Default 30. */
    driftDays?: number;
    index?: string;
    limit?: number;
    includeSystem?: boolean;
    concurrency?: number;
    pageParallelism?: number;
    exclude?: string[];
    since?: string;
    baseline?: boolean;
    output?: string;
    format?: "json" | "csv" | "markdown";
}
export interface FallbackDriftReport {
    itemId: string;
    path: string;
    targetLanguage: string;
    referenceUpdatedDate: string | null;
    targetUpdatedDate: string | null;
    driftDays: number;
}
/**
 * Audit items where the target-language version is older than the
 * reference-language version by more than `--drift-days` days.
 *
 * Catches the "English content was edited but the French translation
 * wasn't refreshed" pattern — different from `translation-coverage`
 * (presence/absence) and `language-data list` (zero-version
 * entries).
 *
 * Strategy:
 *   1. Enumerate items in `--reference-language`; index by itemId
 *      with their `updatedDate`.
 *   2. Per `--target-language`: enumerate items, compare each
 *      target's `updatedDate` against the reference's. If
 *      `reference - target > --drift-days`, flag it.
 *   3. Sort by drift descending — biggest gaps first.
 *
 * Notes:
 *   - Items without a target-language version are NOT reported here
 *     (use `translation-coverage` for that).
 *   - "Drift" only flows in one direction: reference newer than
 *     target. The reverse (target newer than reference) is unusual
 *     but legal — and we don't report it.
 */
export declare const runAuditFallbackDrift: (options: AuditFallbackDriftOptions) => Promise<FallbackDriftReport[]>;