import { kBackend } from './constants.js';
import { FetchBackend } from './fetch-backend.js';
import { HttpClientBase } from './http-client-base.js';
/**
 * Default implementation of {@link HttpClientBase} using {@link FetchBackend}.
 *
 * @class OpraHttpClient
 */
export declare class OpraHttpClient extends HttpClientBase<FetchBackend.RequestOptions> {
    [kBackend]: FetchBackend;
    /**
     * Creates a new instance of OpraHttpClient.
     *
     * @param serviceUrl The base URL of the service.
     * @param options Configuration options.
     */
    constructor(serviceUrl: string, options?: FetchBackend.Options);
    /**
     * Gets the default request options from the backend.
     */
    get defaults(): FetchBackend.RequestDefaults;
}