Input for cart's TotalAmount does not account for discounts in product discount function

[kylebuildsstuff]

Which template or example

• Product discount function, Typescript
• API version 2024/04

Describe the bug

When requesting the cart's total amount in the product function's Input object the value returned does not account for discounts. This creates issues when applying product discounts based on the total amount of the cart.

Steps to reproduce

1. Create order discount code for 30% off order
2. Create product discount function requesting cart total amount:

query RunInput {
  cart {
    lines {
      id
      quantity
      cost {
        totalAmount {
          amount
        }
      }
    }

    cost {
      subtotalAmount {
        amount
        currencyCode
      }

      totalAmount {
        amount
        currencyCode
      }
    }

3. Run product discount and apply discount code
4. Observe function logs

Expected behavior

The total amount of the cart returned by the product function's Input object should account for changes in amount from discounts and discount codes as well

Environment

• Mac Sonoma 14.1.1 (23B2082)

• "@shopify/cli": "^3.68.1",

Additional context

An example of the cart:

Input (STDIN):

{
  "cart": {
    "lines": [
      {
        "id": "gid://shopify/CartLine/0",
        "quantity": 1,
        "attribute": null,
        "userAttribute": null,
        "merchandise": {
          "id": "gid://shopify/ProductVariant/47328231325999",
          "weight": 10,
          "weightUnit": "POUNDS",
          "metafield": {
            "value": "{\"applyProductDiscount\":false}"
          }
        },
        "cost": {
          "totalAmount": {
            "amount": "699.95"
          }
        }
      },
      {
        "id": "gid://shopify/CartLine/1",
        "quantity": 1,
        "attribute": null,
        "userAttribute": null,
        "merchandise": {
          "id": "gid://shopify/ProductVariant/47328231751983",
          "weight": 0,
          "weightUnit": "KILOGRAMS",
          "metafield": {
            "value": "..."
          }
        },
        "cost": {
          "totalAmount": {
            "amount": "10.0"
          }
        }
      }
    ],
    "cost": {
      "subtotalAmount": {
        "amount": "709.95",
        "currencyCode": "CAD"
      },
      "totalAmount": {
        "amount": "709.95",
        "currencyCode": "CAD"
      }
    },

}

[kylebuildsstuff]

Working as intended:

https://community.shopify.dev/t/product-discount-functions-cost-totalamount-input-doesnt-account-for-discounts/720/3