Oh! thanks for the reporting this issue. What cart query do you have? Did you query for the cursor property?

@wizardlyhel I subscribed to the 'cart_updated' event and inspected the cart data returned.

@wizardlyhel Also, instead of returning previous line and current line, it would be helpful if you return the difference for add to cart and remove from cart event, just like what you did for Web pixel api.

For example, for adding 4 items of total value $40, instead of returning previous line {item: "a", quantity: 1, value: 10} and current line {item: "a", quantity: 5, value: 50}, it would be better to return {item: "a", quantity: 4, value: 40}.

Also, instead of returning previous line and current line, it would be helpful if you return the difference for add to cart and remove from cart event

You can create an event that can just output an update to a cart line that is a difference. This component cannot assume that a quantity difference is the default for every single analytics frameworks out there, including Shopify's own analytics requirements. It's the reason why we decided to return the previous line and the current line. So that you can calculate the difference if you need.