import { Config } from '../types/types.js';
export type TokenResponse = {
    access_token: string;
    token_type: string;
    expires_in: string;
    scope: string;
    refresh_token?: string;
    auth_time?: string;
    issued_token_type?: string;
};
/**
 * method helper for generating the authorization url in OAuth flows based on the Config,
 * includes code_challenge, PKCE-flow
 * @param state - for validating against potential CSRF attacks,
 * will generate and use a random string if not set
 * @returns authorization url and code verifier
 */
export declare const generateAuthorizationUrl: (config: Config, state?: string) => Promise<{
    url: string;
    verifier: string;
    state: string;
}>;