export declare type GaAction = 'view_search_results' | 'add_payment_info' | 'add_to_cart' | 'add_to_wishlist' | 'begin_checkout' | 'checkout_progress' | 'generate_lead' | 'login' | 'purchase' | 'refund' | 'remove_from_cart' | 'search' | 'select_content' | 'set_checkout_option' | 'share' | 'sign_up' | 'view_item' | 'view_item_list' | 'view_promotion' | 'view_search_results';