export interface LockOptions {
    /** Give up acquiring after this long. */
    maxWaitMs?: number;
    /** Treat a held lock older than this as abandoned and reclaim it. */
    staleMs?: number;
    /**
     * Re-stamp the owner file on this interval while the lock is held (Phase 15.2).
     * A long-lived holder (the sync-watch daemon) would otherwise exceed any waiter's
     * `staleMs` and get its LIVE lock reclaimed. With a heartbeat the stamp stays fresh
     * while the holder is alive, and a crashed holder stops stamping — so the normal
     * stale-reclaim path still frees the lock. Omit for ordinary short critical sections.
     */
    heartbeatMs?: number;
}
/**
 * Run `fn` while holding the named lock under `locksDir`. Serializes concurrent
 * callers (same process or different processes) on the same name.
 */
export declare function withLock<T>(locksDir: string, name: string, fn: () => Promise<T>, opts?: LockOptions): Promise<T>;
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