feat(indexing): add skipIndexing flag (#99)

* Add skipIndexing flag

* Add to README

* Update README.md

Co-authored-by: Haroen Viaene <hello@haroen.me>
Co-authored-by: Haroen Viaene <fingebimus@me.com>

README.md

@@ -79,6 +79,7 @@ module.exports = {
         enablePartialUpdates: true, // default: false
         matchFields: ['slug', 'modified'], // Array<String> default: ['modified']
         concurrentQueries: false, // default: true
+        skipIndexing: true, // default: false, useful for e.g. preview deploys or local development
       },
     },
   ],

gatsby-node.js

@@ -26,11 +26,23 @@ function fetchAlgoliaObjects(index, attributesToRetrieve = ['modified']) {
 }
 
 exports.onPostBuild = async function ({ graphql }, config) {
-  const { appId, apiKey, queries, concurrentQueries = true } = config;
+  const {
+    appId,
+    apiKey,
+    queries,
+    concurrentQueries = true,
+    skipIndexing = false
+  } = config;
 
   const activity = report.activityTimer(`index to Algolia`);
   activity.start();
 
+  if (skipIndexing === true) {
+    setStatus(activity, `options.skipIndexing is true; skipping indexing`);
+    activity.end();
+    return;
+  }
+
   const client = algoliasearch(appId, apiKey);
 
   setStatus(activity, `${queries.length} queries to index`);
@@ -61,6 +73,7 @@ exports.onPostBuild = async function ({ graphql }, config) {
   } catch (err) {
     report.panic('failed to index to Algolia', err);
   }
+
   activity.end();
 };