/**
 * This file contains helper functions to configure an HTTP client
 * with the recommended configuration for the Merchant Center API.
 */
export type THeaders = Record<string, string>;
export type TForwardToAudiencePolicy = 'forward-url-full-path' | 'forward-url-origin';
export type TForwardToExchangeTokenClaim = 'permissions';
export type TForwardToConfigVersion = 'v1' | 'v2';
export type TForwardToConfig = {
    /**
     * The URL of the external API to forward the request to.
     */
    uri: string;
    /**
     * Additional HTTP headers to be included in the request to the external API.
     */
    headers?: THeaders;
    /**
     * The audience policy for verifying the incoming request from the Merchant Center API.
     */
    audiencePolicy?: TForwardToAudiencePolicy;
    /**
     * A list of user permissions to be included in the request to the external API.
     */
    includeUserPermissions?: boolean;
    /**
     * The version of the `/proxy/forward-to` endpoint to use.
     */
    version?: TForwardToConfigVersion;
};
export type TConfig = {
    /**
     * A custom user agent to identify the HTTP client.
     * We recommend to use the `@commercetools/http-user-agent` package.
     *
     * @example
     * import createHttpUserAgent from '@commercetools/http-user-agent';
     *
     * const userAgent = createHttpUserAgent({
     *   name: 'fetch-client',
     *   version: '2.6.0',
     *   libraryName: window.app.applicationName,
     *   contactEmail: 'support@my-company.com',
     * });
     */
    userAgent?: string;
    /**
     * Additional headers to be included in the request.
     * The provided recommended headers won't be overwritten.
     * See `TOptions.headers`.
     */
    headers?: THeaders;
    /**
     * Configuration for using the `/proxy/forward-to` endpoint
     * to connect to an external API.
     * {@link https://docs.commercetools.com/merchant-center-customizations/concepts/integrate-with-your-own-api}
     *
     * @example
     * {
     *   forwardToConfig: {
     *     uri: 'https://my-api.com/my-endpoint',
     *   }
     * }
     */
    forwardToConfig?: TForwardToConfig;
    /**
     * The project key to be assigned to the `x-project-key` header.
     * By default the project key is extracted from the URL.
     * We do not recommend to use this option unless you know what you are doing.
     */
    projectKey?: string;
};
export type TOptions = {
    /**
     * Include user credentials (session token).
     */
    credentials: 'include';
    /**
     * The HTTP headers included by default are:
     * - Accept
     * - Authorization (only in development)
     * - X-Application-Id
     * - X-Correlation-Id
     * - X-Project-Key
     * - X-User-Agent
     */
    headers: THeaders;
};
export type TFetcherResponse<Data> = {
    /**
     * The parsed response from the server.
     */
    data: Data;
    /**
     * The HTTP status code from the server response.
     */
    statusCode: number;
    /**
     * Implement a function to access the HTTP headers from the server response.
     */
    getHeader: (headerName: string) => string | null;
};
export type TFetcher<Data> = (options: TOptions) => Promise<TFetcherResponse<Data>>;
declare function buildApiUrl(endpoint: string): string;
declare function createHttpClientOptions(config?: TConfig): TOptions;
declare function executeHttpClientRequest<Data>(fetcher: TFetcher<Data>, config?: TConfig): Promise<Data>;
export { buildApiUrl, createHttpClientOptions, executeHttpClientRequest };