Merge branch 'master' of github.com:vercel/commerce into outgrow-reaction-commerce-provider

Signed-off-by: Loan Laux <loan@outgrow.io>

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

@@ -0,0 +1,54 @@
+import { Cart, CartItemBody } from '@commerce/types'
+import useAddItem, { UseAddItem } from '@commerce/cart/use-add-item'
+import { CommerceError } from '@commerce/utils/errors'
+import { MutationHook } from '@commerce/utils/types'
+import { useCallback } from 'react'
+import useCart from './use-cart'
+import { AddItemToOrderMutation } from '../schema'
+import { normalizeCart } from '../lib/normalize'
+import { addItemToOrderMutation } from '../lib/mutations/add-item-to-order-mutation'
+
+export default useAddItem as UseAddItem<typeof handler>
+
+export const handler: MutationHook<Cart, {}, CartItemBody> = {
+  fetchOptions: {
+    query: addItemToOrderMutation,
+  },
+  async fetcher({ input, options, fetch }) {
+    if (
+      input.quantity &&
+      (!Number.isInteger(input.quantity) || input.quantity! < 1)
+    ) {
+      throw new CommerceError({
+        message: 'The item quantity has to be a valid integer greater than 0',
+      })
+    }
+
+    const { addItemToOrder } = await fetch<AddItemToOrderMutation>({
+      ...options,
+      variables: {
+        quantity: input.quantity || 1,
+        variantId: input.variantId,
+      },
+    })
+
+    if (addItemToOrder.__typename === 'Order') {
+      return normalizeCart(addItemToOrder)
+    }
+    throw new CommerceError(addItemToOrder)
+  },
+  useHook:
+    ({ fetch }) =>
+    () => {
+      const { mutate } = useCart()
+
+      return useCallback(
+        async function addItem(input) {
+          const data = await fetch({ input })
+          await mutate(data, false)
+          return data
+        },
+        [fetch, mutate]
+      )
+    },
+}