/**
 * Per-PID serialization queue for bridge operations.
 *
 * Ensures that no two snapshot (or other bridge) operations for the same PID
 * overlap.  This prevents "same-PID overlapping calls" across concurrent tool
 * invocations while allowing different PIDs to run in parallel.
 *
 * Usage:
 * ```ts
 * const result = await PidQueue.enqueue(pid, async () => {
 *   // Bridge I/O for this PID – guaranteed non-overlapping per PID.
 * });
 * ```
 */
export declare class PidQueue {
    /** Per-PID linked-list of pending operations. */
    private static readonly queues;
    /**
     * Enqueue a work item for the given PID.
     *
     * Returns a promise that resolves (or rejects) with the item's result.
     * Works items for the same PID are serialised (each waits for the previous).
     * Items for different PIDs run concurrently.
     *
     * @param pid - The Power BI Desktop process ID.
     * @param fn  - Async function to execute once all prior items for this PID
     *              have completed.
     */
    static enqueue<T>(pid: number, fn: () => Promise<T>): Promise<T>;
}
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