import { AxiosInstance, AxiosPromise, AxiosRequestConfig } from 'axios';
import { Base } from '../base';
import { IShifterConfig, IShifterChangeIp } from './types';
/**
 * @description Shifter proxy provider.
 * @extends {Base}
 */
export declare class Shifter extends Base {
    axios: AxiosInstance;
    private readonly config;
    private readonly strategy;
    /**
     * @constructor
     * @param {IShifterConfig} config
     */
    constructor(config: IShifterConfig);
    /**
     * @description Create and set proxy agents. A different port matches a
     * different country / IP.
     * @param {IShifterChangeIp} params Params to handle multiple strategies.
     * @returns {Shifter} An instance of a shifter proxy provider.
     */
    setIp(params?: IShifterChangeIp): Shifter;
    /**
     * @description Picks a random port from a list of matching countries.
     * @param {EShifterCountry[]} countries A list of verified countries.
     * @returns {number} A port number.
     */
    private getRandomPort;
    /**
     * @description Picks a random country among a given list of them.
     * @param {EShifterCountry[]} countries A list of verified countries.
     * @returns {string} A single country from the given list.
     */
    private getRandomCountry;
    /**
     * @description Checks weither or not the mapping contains a single entry.
     * @param {TShifterCountryPortMapping} mapping country to port mapping.
     * @throws {Error} Will throw if mapping has no entries.
     */
    private isCountryPortMappingEmpty;
    /**
     * @description Sends a request.
     * @param {AxiosRequestConfig} axiosRequestConfig
     * @returns {AxiosPromise}
     */
    fetch(axiosRequestConfig: AxiosRequestConfig): AxiosPromise;
    /**
     * @description Creates both an HTTP and HTTPS proxy
     * @param { port: number } params
     * @returns {ICreateProxyConfig}
     */
    private createProxyAgents;
}