/**
 * Hub Server Middleware
 *
 * API key authentication and error handling for the mock hub server.
 *
 * @see s-7utm - Mock Hub Server + HubProvider Implementation
 */
import type { Request, Response, NextFunction } from 'express';
/**
 * API key authentication middleware.
 * Validates `Authorization: Bearer <key>` against the provided list of valid keys.
 */
export declare function apiKeyAuth(validApiKeys: string[]): (req: Request, res: Response, next: NextFunction) => void;
/**
 * Express error handler that maps ProviderError subclasses to HTTP status codes.
 * Must be registered last (4-argument signature).
 */
export declare function errorHandler(error: Error, _req: Request, res: Response, _next: NextFunction): void;
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