1 files changed, 9 insertions, 2 deletions
diff --git a/package.json b/package.json
index 9695dbb..11ea9d9 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,16 @@
     "remark"
   ],
   "devDependencies": {
+    "jest": "^22.1.4",
     "xo": "^0.18.2"
   },
-  "xo" : {
-    "space" : true
+  "xo": {
+    "space": true,
+    "rules": {
+      "comma-dangle": [
+        "error",
+        "always-multiline"
+      ]
+    }
   }
 }