Vendure provider (#223)

* Minimal list/detail views working with Vendure

* Implement useCart/useAddItem

* Implement useUpdateItem & useRemoveItem

* Implement useSearch

* Add operations codegen, tidy up

* Dummy checkout page

* Implement auth/customer hooks

* Use env var for Shop API url

* Add some documentation

* Improve error handling

* Optimize preview image size

* Fix accidental change

* Update Vendure provider to latest changes

* Vendure provider: split out gql operations, remove unused files

* Update Vendure provider readme

* Add local next.config to Vendure provider, update docs

* Update to use demo server

* Fix build errors

* Use proxy for vendure api

* Simplify instructions in Vendure readme

* Refactor Vendure checkout api handler

* Improve image quality

framework/vendure/api/utils/fetch-graphql-api.ts

@@ -0,0 +1,37 @@
+import { FetcherError } from '@commerce/utils/errors'
+import type { GraphQLFetcher } from '@commerce/api'
+import { getConfig } from '..'
+import fetch from './fetch'
+
+const fetchGraphqlApi: GraphQLFetcher = async (
+  query: string,
+  { variables, preview } = {},
+  fetchOptions
+) => {
+  const config = getConfig()
+  const res = await fetch(config.commerceUrl, {
+    ...fetchOptions,
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${config.apiToken}`,
+      ...fetchOptions?.headers,
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({
+      query,
+      variables,
+    }),
+  })
+
+  const json = await res.json()
+  if (json.errors) {
+    throw new FetcherError({
+      errors: json.errors ?? [{ message: 'Failed to fetch Vendure API' }],
+      status: res.status,
+    })
+  }
+
+  return { data: json.data, res }
+}
+
+export default fetchGraphqlApi

framework/vendure/api/utils/fetch.ts

@@ -0,0 +1,3 @@
+import zeitFetch from '@vercel/fetch'
+
+export default zeitFetch()