Fix build errors

framework/swell/cart/use-cart.tsx

@@ -1,27 +1,37 @@
 import useCart, { UseCart } from '@commerce/cart/use-cart'
 import { Cart } from '@commerce/types'
 import { SWRHook } from '@commerce/utils/types'
+import { useMemo } from 'react'
 import { normalizeCart } from '../utils/normalize'
 import { checkoutCreate, checkoutToCart } from './utils'
 
 export default useCart as UseCart<typeof handler>
 
-export const handler: SWRHook<Cart | null> = {
+export const handler: SWRHook<Cart | null, {}, any, { isEmpty?: boolean }> = {
   fetchOptions: {
     query: 'cart',
     method: 'get',
   },
-  async fetcher({ options, fetch }) {
+  async fetcher({ fetch }) {
     const cart = await checkoutCreate(fetch)
 
     return cart ? normalizeCart(cart) : null
   },
   useHook: ({ useData }) => (input) => {
-    return useData({
-      swrOptions: {
-        revalidateOnFocus: false,
-        ...input?.swrOptions,
-      },
+    const response = useData({
+      swrOptions: { revalidateOnFocus: false, ...input?.swrOptions },
     })
+    return useMemo(
+      () =>
+        Object.create(response, {
+          isEmpty: {
+            get() {
+              return (response.data?.lineItems.length ?? 0) <= 0
+            },
+            enumerable: true,
+          },
+        }),
+      [response]
+    )
   },
 }