type EnvironmentVariables = {
    PORT?: string;
    DATABASE_URL?: string;
    JWT_ACCESS_SECRET?: string;
    JWT_REFRESH_SECRET?: string;
    JWT_ACCESS_EXPIRES_IN?: string;
    JWT_REFRESH_EXPIRES_IN?: string;
    CORS_ORIGIN?: string;
    NODE_ENV?: string;
    EMAIL_ENABLED?: string;
    EMAIL_PROVIDER?: string;
    BREVO_API_KEY?: string;
    EMAIL_FROM_ADDRESS?: string;
    EMAIL_FROM_NAME?: string;
    EMAIL_REPLY_TO?: string;
    API_PUBLIC_URL?: string;
    FRONTEND_URL?: string;
    PASSWORD_SETUP_TOKEN_TTL_HOURS?: string;
};
export declare function validateEnv(config: EnvironmentVariables): EnvironmentVariables;
export {};