diff --git a/lib/command-group.js b/lib/command-group.js
index 4dcb8d8..89de5cd 100644
--- a/lib/command-group.js
+++ b/lib/command-group.js
@@ -1,14 +1,13 @@
-"use strict";
-
 const defaultCommand = require('./default-command');
 
 const commands = {
 };
 
-for (let [key, value] of Object.entries(defaultCommand)) {
-    value.forEach(function(element) {
+// eslint-disable-next-line no-restricted-syntax
+for (const [key, value] of Object.entries(defaultCommand)) {
+    value.forEach((element) => {
         commands[element.toLowerCase()] = key.toLowerCase();
-    })
+    });
 }
 
-module.exports = commands;
\ No newline at end of file
+module.exports = commands;