/**
 * Sibling lock path: `MEMORY.md` → `MEMORY.md.lock` (Hermes Path.with_suffix).
 */
export declare function lockPathFor(dataFilePath: string): string;
/**
 * Hold exclusive flock for the duration of `fn`, then unlock + close.
 * Creates the lock file's parent directory if needed.
 */
export declare function withFileLock<T>(dataFilePath: string, fn: () => T | Promise<T>): Promise<T>;
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