chore(promotion): cleanup old unused promotion codebase (medusajs#13294)

* chore(promotion): cleanup old unused code

* changeset

Author: willbouch

.changeset/hungry-ducks-remain.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/promotion": patch
+---
+
+chore(promotion): cleanup old unused promotion codebase

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

@@ -1,8 +1,4 @@
-import {
-  ApplicationMethodAllocationValues,
-  BigNumberInput,
-  PromotionTypes,
-} from "@medusajs/framework/types"
+import { ApplicationMethodAllocationValues, BigNumberInput, PromotionTypes, } from "@medusajs/framework/types"
 import {
   ApplicationMethodAllocation,
   ApplicationMethodTargetType,
@@ -45,9 +41,7 @@ export function getComputedActionsForItems(
 
 function applyPromotionToItems(
   promotion: PromotionTypes.PromotionDTO,
-  items:
-    | PromotionTypes.ComputeActionContext[TargetType.ITEMS]
-    | PromotionTypes.ComputeActionContext[TargetType.SHIPPING_METHODS],
+  items: PromotionTypes.ComputeActionContext[TargetType.ITEMS],
   appliedPromotionsMap: Map<string, BigNumberInput>,
   allocationOverride?: ApplicationMethodAllocationValues
 ): PromotionTypes.ComputeActions[] {
@@ -72,13 +66,10 @@ function applyPromotionToItems(
     return computedActions
   }
 
-  const isTargetShippingMethod = target === TargetType.SHIPPING_METHODS
   const isTargetLineItems = target === TargetType.ITEMS
   const isTargetOrder = target === TargetType.ORDER
   const promotionValue = applicationMethod?.value ?? 0
-  const maxQuantity = isTargetShippingMethod
-    ? 1
-    : applicationMethod?.max_quantity!
+  const maxQuantity = applicationMethod?.max_quantity!
 
   let lineItemsAmount = MathBN.convert(0)
   if (allocation === ApplicationMethodAllocation.ACROSS) {
@@ -109,10 +100,6 @@ function applyPromotionToItems(
       continue
     }
 
-    if (isTargetShippingMethod) {
-      item.quantity = 1
-    }
-
     const appliedPromoValue = appliedPromotionsMap.get(item.id) ?? 0
 
     const amount = calculateAdjustmentAmountFromPromotion(
@@ -152,13 +139,6 @@ function applyPromotionToItems(
         code: promotion.code!,
         is_tax_inclusive: promotion.is_tax_inclusive,
       })
-    } else if (isTargetShippingMethod) {
-      computedActions.push({
-        action: ComputedActions.ADD_SHIPPING_METHOD_ADJUSTMENT,
-        shipping_method_id: item.id,
-        amount,
-        code: promotion.code!,
-      })
     }
   }