/**
 * Format token response for the client
 *
 * Supports two response formats:
 * 1. JSON response (for API clients)
 * 2. Redirect with token in URL fragment (for web browsers)
 *
 * URL fragments are used for security - they are NOT sent to the server
 * in HTTP requests and are only accessible to client-side JavaScript.
 *
 * @param token - JWT token for the application
 * @param user - User object
 * @param redirectUrl - URL to redirect to
 * @param responseType - "json" or undefined (redirect)
 * @returns Flink response object
 */
export declare function formatTokenResponse(token: string, user: any, redirectUrl: string, responseType?: "json"): any;
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