/**
 * Formats the OAuth callback response with JWT token.
 * Supports multiple response formats:
 * - JSON response with user and token
 * - URL fragment redirect with token
 * - Query parameter redirect with token
 *
 * @param token - JWT token to return
 * @param user - User object to return
 * @param redirectUrl - Optional redirect URL
 * @param responseType - Response format ('json' or undefined for redirect)
 * @returns Response object for Flink handler
 */
export declare function formatTokenResponse(token: string, user: any, redirectUrl?: string, responseType?: string): any;