1 files changed, 16 insertions, 1 deletions
diff --git a/frontend/lib/withData.js b/frontend/lib/withData.js
index c823e62..93a0db1 100644
--- a/frontend/lib/withData.js
+++ b/frontend/lib/withData.js
@@ -1,6 +1,6 @@
 import withApollo from 'next-with-apollo';
 import ApolloClient from 'apollo-boost';
-
+import { LOCAL_STATE_QUERY } from '../queries/index';
 // can also be a function that accepts a `headers` object (SSR only) and returns a config
 
 const client = new ApolloClient({
@@ -16,6 +16,21 @@ const client = new ApolloClient({
       });
     }
   },
+  clientState: {
+    resolvers: {
+      Mutation: {
+        toggleCart(_, variables, { cache }) {
+          const { cartOpen } = cache.read({ query: LOCAL_STATE_QUERY });
+          const data = { data: { cartOpen: !cartOpen } };
+          cache.writeData(data);
+          return data;
+        },
+      },
+    },
+    defaults: {
+      cartOpen: false,
+    },
+  },
 });
 
 export { client };