import { IncomingMessage, Server, ServerResponse } from 'node:http';
import { FetchBackend, HttpResponse } from '@opra/client';
import { ApiExpect } from './api-expect/api-expect.js';
import type { OpraTestClient } from './test-client.js';
declare type RequestListener = (req: IncomingMessage, res: ServerResponse) => void;
export type ResponseExt = {
    expect: ApiExpect;
};
/**
 * Test specific implementation of {@link FetchBackend} for API testing.
 *
 * @class TestBackend
 */
export declare class TestBackend extends FetchBackend {
    protected _server: Server;
    /**
     * Creates a new instance of TestBackend.
     *
     * @param app The server or request listener to test.
     * @param options Configuration options.
     */
    constructor(app: Server | RequestListener, options?: OpraTestClient.Options);
    /**
     * Sends the actual HTTP request by starting the server if necessary.
     *
     * @param req The request to send.
     * @returns A promise that resolves to the response.
     * @protected
     */
    protected send(req: Request): Promise<Response>;
    /**
     * Creates a {@link HttpResponse} instance with an added `expect` property.
     *
     * @param init The response initiator parameters.
     * @returns A new HttpResponse instance with ApiExpect.
     * @protected
     */
    protected createResponse(init: HttpResponse.Initiator): HttpResponse<any> & ResponseExt;
}
/**
 * Namespace for {@link TestBackend} related types and interfaces.
 *
 * @namespace TestBackend
 */
export declare namespace TestBackend {
    /** Configuration options for TestBackend */
    interface Options extends FetchBackend.Options {
    }
}
export {};