Index: lib/common.js
===================================================================
--- a/lib/common.js
+++ b/lib/common.js
@@ -59,17 +59,17 @@
     // remove trailing wildcards
     .replace(/(\.\*)$/, "");
 }
 
 exports.filterToRegExp = filterToRegExp;
 
 function splitSelector(selector)
 {
-  if (selector.indexOf(",") == -1)
+  if (!selector.includes(","))
     return [selector];
 
   let selectors = [];
   let start = 0;
   let level = 0;
   let sep = "";
 
   for (let i = 0; i < selector.length; i++)