add sign up hook

packages/sylius/src/auth/use-signup.tsx

@@ -1,5 +1,4 @@
 import { useCallback } from 'react'
-import useCustomer from '../customer/use-customer'
 import { MutationHook } from '@vercel/commerce/utils/types'
 import useSignup, { UseSignup } from '@vercel/commerce/auth/use-signup'
 
@@ -7,13 +6,37 @@ export default useSignup as UseSignup<typeof handler>
 
 export const handler: MutationHook<any> = {
   fetchOptions: {
-    query: '',
+    url: '/api/v2/shop/customers',
+    method: 'POST',
   },
-  async fetcher() {
-    return null
+  fetcher: async ({
+    input: { firstName, lastName, email, password },
+    options,
+    fetch,
+  }) => {
+    await fetch({
+      url: options.url,
+      method: options.method,
+      body: {
+        firstName: firstName,
+        lastName: lastName,
+        email: email,
+        password: password,
+        subscribedToNewsletter: false,
+      },
+      variables: {
+        useToken: false,
+      },
+    })
   },
   useHook:
     ({ fetch }) =>
-    () =>
-    () => {},
+    () => {
+      return useCallback(
+        async function signup(input) {
+          await fetch({ input })
+        },
+        [fetch]
+      )
+    },
 }