declare const keys: {
    readonly device_id: "device_id";
    readonly visitor_id: "visitor_id";
    readonly first_open_time: "first_open_time";
    readonly first_visit_time: "first_visit_time";
    readonly fbc: "fbc";
    readonly fbclid: "fbclid";
    readonly rdt_cid: "rdt_cid";
};

export { keys };