/**
 * OAuth2 Authentication Module for Upwork API
 *
 * This module handles OAuth2 authentication flows including:
 * - Authorization Code Grant
 * - Client Credentials Grant
 * - Refresh Token Grant
 * - Implicit Grant
 */
import { AuthConfig, AuthorizationOptions, TokenResponse } from "../types";
export declare class UpworkAuth {
    private clientId;
    private clientSecret;
    private redirectUri?;
    private baseUrl;
    private tokenUrl;
    private authUrl;
    private accessToken;
    private refreshToken;
    private tokenExpiry;
    /**
     * Create an authentication instance
     * @param config - Configuration object
     */
    constructor(config: AuthConfig);
    /**
     * Generate authorization URL for Authorization Code Grant
     * @param options - Authorization options
     * @returns Authorization URL
     */
    getAuthorizationUrl(options?: AuthorizationOptions): string;
    /**
     * Get authorization URL for Implicit Grant
     * @param options - Authorization options
     * @returns Authorization URL
     */
    getImplicitGrantUrl(options?: AuthorizationOptions): string;
    /**
     * Exchange authorization code for access token
     * @param code - Authorization code from callback
     * @returns Token response
     */
    getAccessToken(code: string): Promise<TokenResponse>;
    /**
     * Get access token using Client Credentials Grant
     * @param options - Options
     * @returns Token response
     */
    getClientCredentialsToken(options?: AuthorizationOptions): Promise<TokenResponse>;
    /**
     * Refresh access token using refresh token
     * @param refreshToken - Refresh token (uses stored token if not provided)
     * @returns Token response
     */
    refreshAccessToken(refreshToken?: string): Promise<TokenResponse>;
    /**
     * Set tokens from OAuth response
     * @param tokenData - Token response data
     */
    private setTokens;
    /**
     * Check if access token is expired
     * @returns True if token is expired or about to expire
     */
    isTokenExpired(): boolean;
    /**
     * Get valid access token, refreshing if necessary
     * @returns Valid access token
     */
    getValidToken(): Promise<string>;
    /**
     * Set access token manually (for tokens obtained outside this library)
     * @param accessToken - Access token
     * @param refreshToken - Refresh token
     * @param expiresIn - Expiry time in seconds
     */
    setAccessToken(accessToken: string, refreshToken?: string, expiresIn?: number): void;
    /**
     * Get current access token without validation
     * @returns Current access token or null
     */
    getCurrentAccessToken(): string | null;
    /**
     * Get current refresh token
     * @returns Current refresh token or null
     */
    getCurrentRefreshToken(): string | null;
    /**
     * Handle authentication errors
     * @param error - Error object
     * @returns Formatted error
     */
    private handleAuthError;
}
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