import { Fetch, HttpClient } from "../types/http-client";
/**
 * The set of options that can be used when constructing a the default
 * [[HttpClient]] instance through the [[createHttpClient]] factory
 * method.
 */
export interface HttpClientOptions {
    /**
     * The `fetch` function to use to make the actual low-level HTTP
     * request.
     *
     * **Inferrence**<br><br>
     * When not provided (default), the `fetch` to use is actually inferred
     * based on the runtime environment.
     *
     * If a `window.fetch` function exists, which should be the case on a Browser
     * environment, it will be used.
     *
     * If a `global.fetch` function exists, which can be the case upon a
     * `global.fetch = ...` call at the bootstrap phase in a Node.js environment,
     * it will be used
     *
     * Finally, if no `fetch` function could be determined, a [[DfuseError]] is
     * thrown with a message explaining the situtation and a link to the documentation
     * on how to solve the problem.
     *
     * @default `undefined` (Inferred based on environment, see `Inferrence` note above)
     */
    fetch?: Fetch;
}
/**
 * Create the default [[HttpClient]] concrete implementation.
 *
 * @param authUrl The full dfuse Authentication url to use to perform the `authRequest` calls.
 * @param apiUrl The full dfuse REST API url to use to perform the `apiRequest` calls.
 * @param options The set of options used to construct the default [[HttpClient]] instance. See
 * [[HttpClientOptions]] for documentation of the options and default values for each of them.
 */
export declare function createHttpClient(authUrl: string, apiUrl: string, options?: HttpClientOptions): HttpClient;