import type { CreateServerOptions, ServerApp, ServerWebSocketSession } from './types';
/**
 * Returns `true` when the request is a WebSocket upgrade handshake.
 */
export declare const isWebSocketRequest: (request: Request) => boolean;
/**
 * Type guard for values returned by `handleWebSocket()`.
 */
export declare const isServerWebSocketSession: (value: unknown) => value is ServerWebSocketSession;
/**
 * Create a lightweight, Express-inspired request pipeline for SSR-aware
 * backends without introducing runtime dependencies.
 *
 * @example
 * ```ts
 * import { createServer } from '@bquery/bquery/server';
 *
 * const app = createServer();
 * app.get('/health', (ctx) => ctx.json({ ok: true }));
 *
 * const response = await app.handle('/health');
 * ```
 */
export declare const createServer: (options?: CreateServerOptions) => ServerApp;
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