export declare const dataLayer: () => any;
export declare function formatGTMItem(data: any, quantity?: number): {
    item_name: any;
    item_id: any;
    price: any;
    item_brand: any;
    item_category: any;
    item_category_2: any;
    item_category_3: any;
    item_category_4: any;
    item_variant: any;
    item_list_name: string;
    item_list_id: string;
    index: number;
    quantity: number;
};