/** Expose connection stats for diagnostic endpoints */
export declare function getConnectionStats(): {
    currentConnections: number;
    currentConcurrentRequests: number;
    maxConnections: number;
    maxConcurrentConnections: number;
};
/**
 * Creates and configures a Fastify application instance for the MCP Hub Lite service.
 *
 * This function sets up the complete HTTP server with all necessary routes, middleware,
 * and static file serving capabilities. It configures CORS headers for development,
 * registers all API routes (MCP gateway, web APIs, and WebSocket endpoints), and serves
 * the frontend SPA from the client directory.
 *
 * The application follows a layered architecture:
 * - API routes are registered first to ensure proper routing precedence
 * - Static file serving is configured for the built frontend assets
 * - SPA fallback handling redirects non-API routes to index.html for client-side routing
 *
 * @returns {Promise<import('fastify').FastifyInstance>} A configured Fastify instance ready to listen for requests
 * @throws {Error} If Fastify fails to initialize or register plugins
 *
 * @example
 * ```typescript
 * const app = await buildApp();
 * await app.listen({ port: 3000, host: '0.0.0.0' });
 * ```
 */
export declare function buildApp(): Promise<import("fastify").FastifyInstance<import("node:http").Server<typeof import("node:http").IncomingMessage, typeof import("node:http").ServerResponse>, import("node:http").IncomingMessage, import("node:http").ServerResponse<import("node:http").IncomingMessage>, import("fastify").FastifyBaseLogger, import("fastify").FastifyTypeProviderDefault>>;
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