diff --git a/lib/only.js b/lib/only.js
index c01c74a4f..0551a3354 100644
--- a/lib/only.js
+++ b/lib/only.js
@@ -1,12 +1,11 @@
 module.exports = (obj, keys) => {
-  obj = obj || {};
-  if ('string' == typeof keys) keys = keys.split(/ +/);
-  const ret = {};
+  obj = obj || {}
+  if (typeof keys === 'string') keys = keys.split(/ +/)
+  const ret = {}
   for (let i = 0; i < keys.length; i++) {
-    const key = keys[i];
-    if (null == obj[key]) continue;
-    ret[key] = obj[key];
+    const key = keys[i]
+    if (obj[key] == null) continue
+    ret[key] = obj[key]
   }
-  return ret;
-
-};
+  return ret
+}