export declare function writePrivateText(path: string, content: string): Promise<void>;
export declare function writePrivateJson(path: string, value: unknown): Promise<void>;
export declare function removePrivateFileDurably(path: string): Promise<void>;
export declare function readJsonIfExists(path: string): Promise<unknown | undefined>;
/**
 * Serializes writers for a private credential file. A stale lock is recoverable
 * after a bounded interval so a crashed Numa process cannot permanently block
 * credential repair.
 */
export declare function withPrivateFileLock<T>(targetPath: string, operation: () => Promise<T>, options?: {
    timeoutMs?: number;
    staleAfterMs?: number;
}): Promise<T>;