Fix check variant helper

Author: ScopeyNZ

package.json

@@ -12,7 +12,7 @@
   ],
   "description": "ReactJS hooks for using Commerce.js with React projects",
   "main": "dist/index.js",
-  "source": "src/index.js",
+  "source": "src/index.ts",
   "repository": "https://github.com/chec/react-commercejs-hooks",
   "author": "Chec Platform Ltd.",
   "license": "BSD-3-Clause",

src/checkout/useCheckVariant.ts

@@ -15,10 +15,7 @@ export default function useCheckVariant() {
       return commerce.checkout.checkVariant(
         checkout.id,
         lineItemId,
-        {
-          group_id: variantId,
-          option_id: optionId,
-        },
+        { options: [optionId] },
       ).then((result: any) => {
         updateLive(result.live);
         return result;