import type { LockManager } from "../interfaces.ts";
/**
 * `fileLockManager(locksDir)` — file-backed `LockManager`.
 *
 * Each lock is a JSON file at `<locksDir>/<agent>__<op>.lock` containing
 * `{ pid, op, agent, heartbeat }`. Atomicity is provided by the `wx` open
 * flag. Stale locks (dead PID OR heartbeat older than 60 s) are reclaimed
 * before a new acquire attempt.
 *
 * A background `setInterval` at 30 s refreshes the heartbeat while the lock
 * is held. The interval is `unref()`-ed so it does not keep the process alive.
 */
export declare function fileLockManager(locksDir: string): LockManager;
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