Add eslint

package.json

@@ -8,7 +8,8 @@
   "types": "./typings/jquery.autocomplete.d.ts",
   "license": "MIT",
   "scripts": {
-    "format": "prettier --write ./src/**"
+    "format": "prettier --write ./src/**",
+    "lint": "eslint ./src"
   },
   "repository": {
     "type": "git",
@@ -19,6 +20,7 @@
   },
   "devDependencies": {
     "@types/jquery": "^3.5.22",
+    "eslint": "^8.51.0",
     "grunt": "^1.0.1",
     "grunt-contrib-uglify": "^1.0.1",
     "jquery-mockjax": "^2.6.0",
@@ -31,9 +33,23 @@
     "trailingComma": "es5",
     "tabWidth": 4
   },
+  "eslintConfig": {
+    "env": {
+      "browser": true
+    },
+    "extends": [
+      "eslint:recommended"
+    ],
+    "globals": {
+      "define": "readonly",
+      "jQuery": "readonly",
+      "module": "readonly",
+      "require": "readonly"
+    }
+  },
   "files": [
     "dist/",
     "typings/jquery-autocomplete/*.d.ts",
     "readme.md"
   ]
-}
+}

src/jquery.autocomplete.js

@@ -6,9 +6,6 @@
  *  For details, see the web site: https://github.com/devbridge/jQuery-Autocomplete
  */
 
-/*jslint  browser: true, white: true, single: true, this: true, multivar: true */
-/*global define, window, document, jQuery, exports, require */
-
 // Expose plugin as an AMD module if AMD loader is present:
 (function (factory) {
     'use strict';
@@ -673,7 +670,7 @@
                 beforeRender = options.beforeRender,
                 html = '',
                 category,
-                formatGroup = function (suggestion, index) {
+                formatGroup = function (suggestion) {
                     var currentCategory = suggestion.data[groupBy];
 
                     if (category === currentCategory) {