/**
 * Acquires an exclusive lock on `filePath` using an atomic `.lock` sentinel file,
 * runs `fn`, then releases the lock. Retries up to MAX_RETRIES times with
 * exponential back-off + jitter before throwing.
 *
 * Uses O_CREAT|O_EXCL (the `wx` flag) which is atomic on POSIX and NTFS —
 * the same primitive proper-lockfile uses internally.
 */
export declare function withLock<T>(filePath: string, fn: () => Promise<T>): Promise<T>;
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