feat: refactor group-helper

Author: jamesgeorge007

lib/utils/group-helper.js

@@ -114,10 +114,10 @@ class GroupHelper {
         if (filename && Array.isArray(filename)) {
             return filename.map(fp => this.resolveFilePath(fp, defaultValue)).filter(e => e);
         }
-        if (filename && filename.indexOf('.js') < 0) {
+        if (filename && filename.includes('.js')) {
             filename = filename + '.js';
         }
-        if (defaultValue && defaultValue.indexOf('.js') < 0) {
+        if (defaultValue && defaultValue.includes('.js')) {
             defaultValue = defaultValue + '.js';
         }
         let configPath;