allow adding discounts in cart

packages/features/medusa-storefront/src/lib/data/cart.ts

@@ -87,7 +87,10 @@ export async function getOrSetCart(countryCode: string) {
   return cart;
 }
 
-export async function updateCart({ id, ...data }: HttpTypes.StoreUpdateCart & { id?: string }) {
+export async function updateCart(
+  { id, ...data }: HttpTypes.StoreUpdateCart & { id?: string },
+  { onSuccess, onError }: { onSuccess: () => void, onError: () => void } = { onSuccess: () => {}, onError: () => {} }, 
+) {
   const cartId = id || (await getCartId());
 
   if (!cartId) {
@@ -109,9 +112,13 @@ export async function updateCart({ id, ...data }: HttpTypes.StoreUpdateCart & {
       const fulfillmentCacheTag = await getCacheTag("fulfillment");
       revalidateTag(fulfillmentCacheTag);
 
+      onSuccess();
       return cart;
     })
-    .catch(medusaError);
+    .catch((e) => {
+      onError();
+      return medusaError(e);
+    });
 }
 
 export async function addToCart({
@@ -259,7 +266,10 @@ export async function initiatePaymentSession(
     .catch(medusaError);
 }
 
-export async function applyPromotions(codes: string[]) {
+export async function applyPromotions(
+  codes: string[],
+  { onSuccess, onError }: { onSuccess: () => void, onError: () => void } = { onSuccess: () => {}, onError: () => {} }, 
+) {
   const cartId = await getCartId();
 
   if (!cartId) {
@@ -278,8 +288,13 @@ export async function applyPromotions(codes: string[]) {
 
       const fulfillmentCacheTag = await getCacheTag("fulfillment");
       revalidateTag(fulfillmentCacheTag);
+
+      onSuccess();
     })
-    .catch(medusaError);
+    .catch((e) => {
+      onError();
+      return medusaError(e);
+    });
 }
 
 export async function applyGiftCard(code: string) {
@@ -427,7 +442,7 @@ export async function placeOrder(cartId?: string, options: { revalidateCacheTags
   } else {
     throw new Error("Cart is not an order");
   }
-  
+
   return retrieveOrder(cartRes.order.id);
 }