/**
 * Freshness helpers shared by `harn backup snapshot` and the session-start
 * scheduler. The host cache is a local, best-effort record of this machine's
 * newest known snapshot: the scheduler reads it to skip a remote restic round
 * trip when the host is plainly current, and restic stays the authority
 * whenever the cache is missing, stale, or written by another host.
 */
export declare function parseBackupDuration(value: string): number | null;
/** Newest snapshot time (epoch ms) in `restic snapshots --json` output, or null. */
export declare function newestSnapshotTime(output: string): number | null;
export interface HostSnapshotCache {
    host: string;
    snapshotAt: number;
}
export declare function hostSnapshotCachePath(harneryDir: string): string;
export declare function readHostSnapshotCache(harneryDir: string): HostSnapshotCache | null;
export declare function recordHostSnapshot(harneryDir: string, snapshotAt: number): void;
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