import { unlink } from 'node:fs/promises';
import type { BackupLockHolder } from '../../application/ports/outbound/IWorldBackupPort.js';
/** The lock file content: who holds it. `op` names the operation. */
export type FileLockHolder = Omit<BackupLockHolder, 'op'> & {
    op: string;
};
export type FileLock = {
    ok: true;
    release: () => Promise<void>;
} | {
    ok: false;
    holder?: FileLockHolder;
};
export type BackupLock = {
    ok: true;
    release: () => Promise<void>;
} | {
    ok: false;
    holder?: BackupLockHolder;
};
/** Unlink of the lock file in release(); tests replace it to interleave a takeover. */
export declare const lockFsOps: {
    unlink: typeof unlink;
};
export declare function acquireBackupLock(root: string, op: BackupLockHolder['op'], options?: {
    waitMs?: number;
    pollMs?: number;
}): Promise<BackupLock>;
/**
 * Take `lockPath` (its directory must exist), waiting up to `waitMs` for the
 * holder; `{ ok: false, holder }` when it is still held.
 */
export declare function acquireFileLock(lockPath: string, op: string, options?: {
    waitMs?: number;
    pollMs?: number;
}): Promise<FileLock>;
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