import { IncomingHttpHeaders } from "node:http";
import { RequestOptions, RequestResponse } from "./request";
import { HttpieError } from "./class/HttpieCommonError";
import { HttpieOnHttpError } from "./class/HttpieOnHttpError";
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 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<RequestOptions, "headers" | "authorization">>): IncomingHttpHeaders;
export declare function isHttpieError(error: unknown): error is HttpieError;
export declare function isHTTPError<T extends RequestResponse<any> = RequestResponse<any>>(error: unknown): error is HttpieOnHttpError<T>;
export declare function createBody(body: undefined): undefined;
export declare function createBody(body: any, headers?: IncomingHttpHeaders): string | Buffer;
/**
 * @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";