/**
 * Run fn exclusively: waits for all in-flight (running or queued) file mutations to
 * drain, then blocks new ones and other exclusive runs until fn settles. Exclusive
 * runs themselves queue FIFO against each other.
 */
export declare function withExclusiveMutationBarrier<T>(fn: () => Promise<T>): Promise<T>;
/**
 * Serialize file mutation operations targeting the same file.
 * Operations for different files still run in parallel.
 */
export declare function withFileMutationQueue<T>(filePath: string, fn: () => Promise<T>): Promise<T>;
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