fix/saleor: handle non-existing checkout

framework/saleor/api/operations/get-site-info.ts

@@ -18,7 +18,7 @@ export default function getSiteInfoOperation({ commerce }: OperationContext<Prov
     query?: string
     config?: Partial<SaleorConfig>
     preview?: boolean
-    variables?: any 
+    variables?: any
   } = {}): Promise<GetSiteInfoResult> {
     const cfg = commerce.getConfig(config)
 

framework/saleor/cart/use-add-item.tsx

@@ -6,7 +6,7 @@ import useCart from './use-cart'
 
 import * as mutation from '../utils/mutations'
 
-import { getCheckoutId, checkoutToCart } from '../utils'
+import { getCheckoutId, checkoutToCart, checkoutCreate } from '../utils'
 
 import { Mutation, MutationCheckoutLinesAddArgs } from '../schema'
 import { AddItemHook } from '@commerce/types/cart'
@@ -35,20 +35,39 @@ export const handler: MutationHook<AddItemHook> = {
       },
     })
 
+    if (checkoutLinesAdd?.errors) {
+      await checkoutCreate(fetch)
+
+      const { checkoutLinesAdd } = await fetch<Mutation, MutationCheckoutLinesAddArgs>({
+        ...options,
+        variables: {
+          checkoutId: getCheckoutId().checkoutId,
+          lineItems: [
+            {
+              variantId: item.variantId,
+              quantity: item.quantity ?? 1,
+            },
+          ],
+        },
+      })
+
+      return checkoutToCart(checkoutLinesAdd)
+    }
+
     return checkoutToCart(checkoutLinesAdd)
   },
   useHook:
     ({ fetch }) =>
-    () => {
-      const { mutate } = useCart()
+      () => {
+        const { mutate } = useCart()
 
-      return useCallback(
-        async function addItem(input) {
-          const data = await fetch({ input })
-          await mutate(data, false)
-          return data
-        },
-        [fetch, mutate]
-      )
-    },
+        return useCallback(
+          async function addItem(input) {
+            const data = await fetch({ input })
+            await mutate(data, false)
+            return data
+          },
+          [fetch, mutate]
+        )
+      },
 }

framework/saleor/cart/use-cart.tsx

@@ -16,12 +16,18 @@ export const handler: SWRHook<GetCartHook> = {
     let checkout
 
     if (checkoutId) {
-      const checkoutId = getCheckoutId().checkoutToken
+      const r = getCheckoutId()
+      const checkoutToken = r.checkoutToken
+
       const data = await fetch({
         ...options,
-        variables: { checkoutId },
+        variables: { checkoutId: checkoutToken },
       })
 
+      if (!data.checkout) {
+        checkout = await checkoutCreate(fetch)
+      }
+
       checkout = data
     }
 
@@ -33,21 +39,21 @@ export const handler: SWRHook<GetCartHook> = {
   },
   useHook:
     ({ useData }) =>
-    (input) => {
-      const response = useData({
-        swrOptions: { revalidateOnFocus: false, ...input?.swrOptions },
-      })
-      return useMemo(
-        () =>
-          Object.create(response, {
-            isEmpty: {
-              get() {
-                return (response.data?.lineItems.length ?? 0) <= 0
+      (input) => {
+        const response = useData({
+          swrOptions: { revalidateOnFocus: false, ...input?.swrOptions },
+        })
+        return useMemo(
+          () =>
+            Object.create(response, {
+              isEmpty: {
+                get() {
+                  return (response.data?.lineItems.length ?? 0) <= 0
+                },
+                enumerable: true,
               },
-              enumerable: true,
-            },
-          }),
-        [response]
-      )
-    },
+            }),
+          [response]
+        )
+      },
 }