/**
 * Per-file async mutation lock.
 *
 * Serializes concurrent mutations (Edit, Write) that target the same file
 * while allowing mutations on different files to proceed in parallel.
 *
 * Uses promise chaining rather than OS mutexes: each `acquire()` appends
 * a new link to the per-path chain. The caller awaits the previous link
 * (serialization) and receives a `release` callback that resolves the
 * current link so the next waiter can proceed.
 */
export declare class FileMutationLock {
    private chains;
    /**
     * Acquire exclusive mutation access for a file path.
     * Returns a release function that MUST be called when done (use try/finally).
     */
    acquire(filePath: string): Promise<() => void>;
    /** Clear all chains. Safe to call between agentic loops. */
    clear(): void;
}
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