/**
 * Label Studio SSO Service
 *
 * Handles JWT token acquisition from Label Studio for SSO authentication.
 * The client application requests JWT tokens from Label Studio's token API,
 * then uses cookie-based authentication to automatically log users in.
 */
export declare class LabelStudioSSOService {
    /**
     * Get Label Studio SSO configuration
     */
    private static getConfig;
    /**
     * Request JWT token from Label Studio for SSO authentication
     *
     * @param email User email address
     * @returns JWT token and expiry time, or null if failed
     *
     * @example
     * ```typescript
     * const tokenData = await LabelStudioSSOService.getSSOToken('user@example.com')
     * if (tokenData) {
     *   console.log('Token:', tokenData.token)
     *   console.log('Expires in:', tokenData.expires_in, 'seconds')
     * }
     * ```
     */
    static getSSOToken(email: string): Promise<{
        token: string;
        expires_in: number;
    } | null>;
    /**
     * Verify SSO configuration is properly set up
     *
     * @returns True if configuration is valid
     */
    static verifyConfig(): boolean;
}