/**
 * Retention-based purge for analytics event files.
 *
 * Deletes JSONL files older than the configured retention period.
 */
/**
 * Purge JSONL event files older than the retention period.
 *
 * @param eventsDir Absolute path to the analytics events directory
 * @param retentionDays Number of days to retain (files older than this are deleted)
 * @param now Reference time for age calculation
 * @returns List of deleted file names
 */
export declare function purgeOldEvents(eventsDir: string, retentionDays: number, now: Date): string[];
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