/**
 * Run `fn` while holding the per-file mutation lock for `filePath`.
 *
 * `filePath` may be a single path or an array of paths. For an array, each
 * file gets its own per-file queue key (NOT a joined blob — a joined key would
 * fail to serialize against single-path locks on the same file). Keys are
 * sorted and acquired in a fixed order to avoid deadlock between two array
 * locks that share a subset of files. The callback runs only once all locks
 * are held and every lock is released in the `finally` block.
 */
export declare function withFileMutationQueue<T>(filePath: string | string[], fn: () => Promise<T>): Promise<T>;
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