use linting node >= 6

.eslintrc

@@ -1,15 +1,13 @@
 {
   "root": true,
 
-  "extends": "airbnb-base/legacy",
+  "extends": "airbnb-base",
 
   "rules": {
     "global-require": 0,
-    "no-var": 0,
     "strict": ["error", "global"]
   },
   "parserOptions": {
-    "ecmaVersion": 5,
     "sourceType": "script"
   },
 }

index.js

@@ -1,60 +1,60 @@
 'use strict';
 
-var assign = require('object.assign');
-var declare = require('@babel/helper-plugin-utils').declare;
+const assign = require('object.assign');
+const { declare } = require('@babel/helper-plugin-utils');
 
-var defaultTargets = {
+const defaultTargets = {
   android: 30,
   chrome: 35,
   edge: 14,
   explorer: 9,
   firefox: 52,
   safari: 8,
-  ucandroid: 1
+  ucandroid: 1,
 };
 
 function buildTargets(options) {
   return assign({}, defaultTargets, options.additionalTargets);
 }
 
-module.exports = declare(function buildAirbnbPreset(api, options) {
-  var transpileTargets = (options && options.targets) || buildTargets(options || {});
+module.exports = declare((api, options) => {
+  const transpileTargets = (options && options.targets) || buildTargets(options || {});
 
-  var debug = (options && typeof options.debug === 'boolean') ? !!options.debug : false;
+  const debug = (options && typeof options.debug === 'boolean') ? !!options.debug : false;
 
   api.assertVersion(7);
 
   return {
     presets: [
       [require('@babel/preset-env'), {
-        debug: debug,
+        debug,
         exclude: [
           'transform-async-to-generator',
           'transform-template-literals',
-          'transform-regenerator'
+          'transform-regenerator',
         ],
         modules: options.modules,
-        targets: transpileTargets
+        targets: transpileTargets,
       }],
-      [require('@babel/preset-react'), { development: api.env('development') }]
+      [require('@babel/preset-react'), { development: api.env('development') }],
     ],
     plugins: [
       options && !!options.removePropTypes ? ['babel-plugin-transform-react-remove-prop-types', assign({
         mode: 'wrap',
         additionalLibraries: ['airbnb-prop-types'],
-        ignoreFilenames: ['node_modules']
+        ignoreFilenames: ['node_modules'],
       }, options.removePropTypes)] : null,
 
       [require('@babel/plugin-transform-template-literals'), {
-        spec: true
+        spec: true,
       }],
       require('@babel/plugin-transform-property-mutators'),
       require('@babel/plugin-transform-member-expression-literals'),
       require('@babel/plugin-transform-property-literals'),
       require('@babel/plugin-transform-jscript'),
       [require('@babel/plugin-proposal-object-rest-spread'), {
-        useBuiltIns: true
-      }]
-    ].filter(Boolean)
+        useBuiltIns: true,
+      }],
+    ].filter(Boolean),
   };
 });