export interface FileLockOptions {
    lockWaitMs?: number;
    staleLockMs?: number;
    /**
     * Durable writers wait long enough to reclaim a fresh dead owner. Hot paths
     * may opt out and handle a short best-effort timeout themselves.
     */
    reclaimFreshDeadOwner?: boolean;
}
export interface AtomicJsonLineOptions {
    mode?: number;
    lock?: FileLockOptions;
}
export declare function withFileLockSync<T>(filePath: string, action: () => T, options?: FileLockOptions): T;
export declare function writeJsonFileAtomically(filePath: string, value: unknown, options?: {
    mode?: number;
}): void;
export declare function writeTextFileAtomically(filePath: string, content: string, options?: {
    mode?: number;
}): void;
export declare function updateJsonFileAtomically<T>(filePath: string, parse: (value: unknown) => T | null, update: (current: T | null) => T | null, options?: {
    lock?: FileLockOptions;
}): T | null;
export declare function appendUniqueJsonLineAtomically<T extends {
    id: string;
}>(filePath: string, value: T, parse: (value: unknown) => T | null, options?: AtomicJsonLineOptions): {
    value: T;
    appended: boolean;
};
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