1 files changed, 42 insertions, 0 deletions
diff --git a/stepped-solutions/40/frontend/lib/withData.js b/stepped-solutions/40/frontend/lib/withData.js
new file mode 100755
index 0000000..33908d6
--- /dev/null
+++ b/stepped-solutions/40/frontend/lib/withData.js
@@ -0,0 +1,42 @@
+import withApollo from 'next-with-apollo';
+import ApolloClient from 'apollo-boost';
+import { endpoint } from '../config';
+import { LOCAL_STATE_QUERY } from '../components/Cart';
+
+function createClient({ headers }) {
+  return new ApolloClient({
+    uri: process.env.NODE_ENV === 'development' ? endpoint : endpoint,
+    request: operation => {
+      operation.setContext({
+        fetchOptions: {
+          credentials: 'include',
+        },
+        headers,
+      });
+    },
+    // local data
+    clientState: {
+      resolvers: {
+        Mutation: {
+          toggleCart(_, variables, { cache }) {
+            // read the cartOpen value from the cache
+            const { cartOpen } = cache.readQuery({
+              query: LOCAL_STATE_QUERY,
+            });
+            // Write the cart State to the opposite
+            const data = {
+              data: { cartOpen: !cartOpen },
+            };
+            cache.writeData(data);
+            return data;
+          },
+        },
+      },
+      defaults: {
+        cartOpen: true,
+      },
+    },
+  });
+}
+
+export default withApollo(createClient);