import { AxiosInstance } from 'axios';
import { StoredToken, PasswordLimitedGrantConfig } from '../types';
import { TokenManager } from './token-manager';
/**
 * PasswordLimitedGrantAuth handles authentication using the password_limited grant.
 * This grant is suitable for headless/server-side clients with registered users.
 *
 * See: https://oauth.iracing.com/oauth2/book/token_endpoint.html#password-limited-grant
 */
export declare class PasswordLimitedGrantAuth {
    private config;
    private tokenManager;
    private httpClient;
    private tokenKey;
    constructor(config: PasswordLimitedGrantConfig, tokenManager: TokenManager, httpClient?: AxiosInstance);
    /**
     * Get a valid access token, authenticating if necessary
     * @returns Access token string
     * @throws AuthError if authentication fails
     */
    getAccessToken(): Promise<string>;
    /**
     * Authenticate using username and password
     * @returns Access token string
     * @throws AuthError if authentication fails
     */
    authenticate(): Promise<string>;
    /**
     * Refresh an access token using a refresh token
     * @param refreshToken - The refresh token to use
     * @returns New access token string
     * @throws AuthError if refresh fails
     */
    refreshToken(refreshToken: string): Promise<string>;
    /**
     * Get the current stored token
     * @returns StoredToken or undefined
     */
    getStoredToken(): StoredToken | undefined;
    /**
     * Manually clear the stored token
     */
    clearToken(): void;
    /**
     * Handle token response and store it
     */
    private handleTokenResponse;
    /**
     * Handle errors from authentication requests
     */
    private handleError;
}
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