Added framework folder

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

@@ -0,0 +1,56 @@
+import { useCallback } from 'react'
+import type { HookFetcher } from '@commerce/utils/types'
+import { CommerceError } from '@commerce/utils/errors'
+import useCartAddItem from '@commerce/cart/use-add-item'
+import type { ItemBody, AddItemBody } from '../api/cart'
+import useCart, { Cart } from './use-cart'
+
+const defaultOpts = {
+  url: '/api/bigcommerce/cart',
+  method: 'POST',
+}
+
+export type AddItemInput = ItemBody
+
+export const fetcher: HookFetcher<Cart, AddItemBody> = (
+  options,
+  { item },
+  fetch
+) => {
+  if (
+    item.quantity &&
+    (!Number.isInteger(item.quantity) || item.quantity! < 1)
+  ) {
+    throw new CommerceError({
+      message: 'The item quantity has to be a valid integer greater than 0',
+    })
+  }
+
+  return fetch({
+    ...defaultOpts,
+    ...options,
+    body: { item },
+  })
+}
+
+export function extendHook(customFetcher: typeof fetcher) {
+  const useAddItem = () => {
+    const { mutate } = useCart()
+    const fn = useCartAddItem(defaultOpts, customFetcher)
+
+    return useCallback(
+      async function addItem(input: AddItemInput) {
+        const data = await fn({ item: input })
+        await mutate(data, false)
+        return data
+      },
+      [fn, mutate]
+    )
+  }
+
+  useAddItem.extend = extendHook
+
+  return useAddItem
+}
+
+export default extendHook(fetcher)