How to get subtotal in checkout ui extension

[nsupport]

I am creating a checkout ui extension that take cart subtotal and show a message. I am able to get the cart total using `useTotalAmount`. But, there is no way to get the subtotal.

If anybody know how to get subtotal in checkout ui extension using the documentation https://shopify.dev/docs/apps/checkout/custom

[phester17]

Did you ever find a solution? I am running into the same issue. Strange that there isn't a breakdown of all cart costs (subtotal, shipping, tax, etc) available in the cost object referenced here: https://shopify.dev/docs/api/checkout-ui-extensions/unstable/apis/standardapi

[nsupport]

To get the subtotal, we looped through the lineitems and added the line amounts.

https://shopify.dev/docs/api/checkout-ui-extensions/unstable/react-hooks/cart/usecartlines