saleor: initial cart integration

framework/saleor/utils/mutations/checkout-create.ts

@@ -2,16 +2,19 @@ import { checkoutDetailsFragment } from '../queries/get-checkout-query'
 
 const checkoutCreateMutation = /* GraphQL */ `
   mutation createCheckout {
-    checkoutCreate(input: {}) {
-      checkoutUserErrors {
+    checkoutCreate(input: {
+      email: "customer@example.com", 
+      lines: [{quantity: 1, variantId: "UHJvZHVjdFZhcmlhbnQ6Mjk3"}], 
+      channel: "default-channel"
+    }) {
+      errors {
         code
         field
         message
       }
-      # Breaks GraphQL Codegen
-      # checkout { 
-      #    ${checkoutDetailsFragment}
-      # }
+      checkout { 
+        ${checkoutDetailsFragment}
+      }
     }
   }
 `