fix(promotion, types): non discountable items check (#12644)

* fix(promotions): check if item is discountable

* fix: return earl yonly if non discountable

* fix: update test

* chore: add integration test

packages/core/types/src/promotion/common/compute-actions.ts

@@ -180,6 +180,11 @@ export interface ComputeActionItemLine extends Record<string, unknown> {
    */
   subtotal: BigNumberInput
 
+  /**
+   * Whether the line item is discountable.
+   */
+  is_discountable: boolean
+
   /**
    * The adjustments applied before on the line item.
    */

packages/modules/promotion/src/utils/compute-actions/line-items.ts

@@ -201,7 +201,15 @@ function getValidItemsForPromotion(
   }
 
   return items.filter((item) => {
-    if (!item || !("subtotal" in item) || MathBN.lte(item.subtotal, 0)) {
+    if (!item) {
+      return false
+    }
+
+    if ("is_discountable" in item && !item.is_discountable) {
+      return false
+    }
+
+    if (!("subtotal" in item) || MathBN.lte(item.subtotal, 0)) {
       return false
     }