/**
 * Canonical key for a mutation target: absolute, and symlink-resolved when the path
 * exists so an alias and its target share one queue. A not-yet-created file falls back to
 * the resolved path, which is what lets `write` create files.
 *
 * Exported so callers that need to name the same target (diagnostics, coordination) cannot
 * drift into a second normalizer.
 */
export declare function canonicalMutationKey(filePath: string): Promise<string>;
/**
 * Serialize file mutation operations targeting the same file.
 * Operations for different files still run in parallel.
 *
 * The holder is handed the canonical key this call registered under. Registration already
 * paid for the `realpath`, so a holder that has to name its own target in a diagnostic takes
 * the answer from here instead of resolving the path a second time under the lock.
 */
export declare function withFileMutationQueue<T>(filePath: string, fn: (canonicalKey: string) => Promise<T>): Promise<T>;
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