import { HttpStatusText } from './constants.js';
import { Readable } from 'node:stream';
import { CookieOptions } from './types.js';
import { Buffer } from 'node:buffer';
export declare const serializeToString: (value: unknown) => string;
export declare const isOkay: (status: number) => boolean;
export declare const isRedirect: (status: number) => boolean;
export declare const isError: (status: number) => boolean;
export declare const statusCodeToMessage: (status: number) => HttpStatusText;
export declare const parseJsonStr: (jsonString: string) => object | null;
export declare const isBinary: (value: unknown) => boolean;
/**
 * @returns [filename, path]
 * @param readable
 */
export declare const getFileDescriptorFromReadable: (readable: Readable) => {
    filename: string;
    path: string;
    mimetype: string;
} | null;
export declare const isObject: (candidate: unknown) => candidate is object;
/**
 * Doesn't preserver functions and other non-serializable values
 * @param obj
 */
export declare const copyObject: <T>(obj: T) => T;
export declare const wrapArray: <T>(value: T | T[]) => T[];
/**
 * Converts a stream to a buffer. Loads a file if string is passed.
 * @param stream
 */
export declare const streamToBuffer: (stream: Readable | string) => Promise<Buffer>;
export declare const parseSetCookieHeader: (setCookieHeader?: string[] | string) => Record<string, CookieOptions>;
/**
 * Just a more verbose syntactic sugar for create an async function and immediately calling it.
 * @param value
 */
export declare const wrapInPromise: (value: () => Promise<void>) => Promise<void>;