/// <reference types="node" />
/// <reference types="node" />
/// <reference types="node" />
import { IncomingHttpHeaders } from "http";
import { Dispatcher } from "undici";
import { RequestResponse, ReqOptions } from "./request";
export declare const DEFAULT_HEADER: {
    "user-agent": string;
};
export declare function isAsyncIterable(value: any): boolean;
/**
 * @description Get a valid Node.js charset from the "content-type" http header.
 * @see https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings
 */
export declare function getEncodingCharset(charset?: string): BufferEncoding;
/**
 * @description Parse Undici ResponseData (the body is a Node.js Readable Stream).
 * If the response as a content type equal to 'application/json' we automatically parse it with JSON.parse().
 */
export declare function parseUndiciResponse<T>(response: Dispatcher.ResponseData): Promise<T | string>;
/**
 * @description Create a default plain Object headers that will contains a Set of default values like:
 * - User-agent
 * - Authorization
 */
export declare function createHeaders(options: Partial<Pick<ReqOptions, "headers" | "authorization">>): IncomingHttpHeaders;
export declare function json(object: any): string;
export declare function createBody(body: undefined): undefined;
export declare function createBody(body: any, headers?: IncomingHttpHeaders): string | Buffer;
/**
 * @description Helpers function to generate an Error with all the required properties from the response.
 * We attach them to the error so that they can be retrieved by the developer in a Catch block.
 */
export declare function toError<T>(response: RequestResponse<T>): Error & RequestResponse<T>;
/**
 * @description Helpers to generate a Basic or Bearer token for the HTTP Authorization header.
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization
 */
export declare function createAuthorizationHeader(authorizationHeaderValue: string): string;
export declare const env: NodeJS.ProcessEnv;
export declare function getCurrentEnv(): "dev" | "prod" | "preprod";