export declare const extractUTMParameters: () => {
    utm_source?: undefined;
    utm_medium?: undefined;
    utm_campaign?: undefined;
    utm_term?: undefined;
    utm_content?: undefined;
} | {
    utm_source: string | null;
    utm_medium: string | null;
    utm_campaign: string | null;
    utm_term: string | null;
    utm_content: string | null;
};