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/product/get-product.ts

@@ -0,0 +1,57 @@
+import { Product } from '@commerce/types'
+import { getConfig, VendureConfig } from '../api'
+import { GetProductQuery } from '../schema'
+import { getProductQuery } from '../lib/queries/get-product-query'
+
+async function getProduct({
+  query = getProductQuery,
+  variables,
+  config,
+}: {
+  query?: string
+  variables: { slug: string }
+  config?: VendureConfig
+  preview?: boolean
+}): Promise<Product | {} | any> {
+  config = getConfig(config)
+
+  const locale = config.locale
+  const { data } = await config.fetch<GetProductQuery>(query, { variables })
+  const product = data.product
+
+  if (product) {
+    return {
+      product: {
+        id: product.id,
+        name: product.name,
+        description: product.description,
+        slug: product.slug,
+        images: product.assets.map((a) => ({
+          url: a.preview,
+          alt: a.name,
+        })),
+        variants: product.variants.map((v) => ({
+          id: v.id,
+          options: v.options.map((o) => ({
+            id: o.id,
+            displayName: o.name,
+            values: o.group.options.map((_o) => ({ label: _o.name })),
+          })),
+        })),
+        price: {
+          value: product.variants[0].priceWithTax / 100,
+          currencyCode: product.variants[0].currencyCode,
+        },
+        options: product.optionGroups.map((og) => ({
+          id: og.id,
+          displayName: og.name,
+          values: og.options.map((o) => ({ label: o.name })),
+        })),
+      } as Product,
+    }
+  }
+
+  return {}
+}
+
+export default getProduct