fix(helper-serializer): allow to serialize a helper that has no results

src/__tests__/helper-serializer.js

@@ -0,0 +1,33 @@
+import algoliaClient from 'algoliasearch';
+import algoliaHelper from 'algoliasearch-helper';
+import { serialize } from '../helper-serializer';
+
+test('should be able to serialize a helper', () => {
+  const client = algoliaClient('appId', 'apiKey');
+  const helper = algoliaHelper(client);
+
+  helper.lastResults = new algoliaHelper.SearchResults(helper.state, [
+    {
+      nbHits: 666,
+    },
+  ]);
+  const serialized = serialize(helper);
+
+  expect(serialized.searchParameters).toEqual(expect.any(Object));
+  expect(serialized.appId).toEqual('appId');
+  expect(serialized.apiKey).toEqual('apiKey');
+  expect(serialized.response).toEqual([
+    {
+      nbHits: 666,
+    },
+  ]);
+});
+
+test('should be able to serialize a helper that has done no query to Algolia yet', () => {
+  const client = algoliaClient('appId', 'apiKey');
+  const helper = algoliaHelper(client);
+
+  const serialized = serialize(helper);
+
+  expect(serialized.response).toBeNull();
+});

src/helper-serializer.js

@@ -8,11 +8,13 @@ export const serialize = function(helper) {
 
   const client = helper.getClient();
 
+  const response = helper.lastResults ? helper.lastResults._rawResults : null;
+
   const serialized = {
     searchParameters: Object.assign({}, helper.state),
     appId: client.applicationID,
     apiKey: client.apiKey,
-    response: helper.lastResults._rawResults,
+    response,
   };
 
   return serialized;
@@ -25,10 +27,13 @@ export const deserialize = function(data) {
     data.searchParameters.index,
     data.searchParameters
   );
-  helper.lastResults = new algoliaHelper.SearchResults(
-    helper.state,
-    data.response
-  );
+
+  if (data.response) {
+    helper.lastResults = new algoliaHelper.SearchResults(
+      helper.state,
+      data.response
+    );
+  }
 
   return helper;
 };