Use babel

Author: goto-bus-stop

.gitignore

@@ -26,3 +26,5 @@ build/Release
 # https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
 node_modules
 package-lock.json
+
+lib/*

.npmignore

@@ -0,0 +1,9 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', {
+      spec: true
+    }]
+  ],
+  plugins: [
+  ]
+}

babel.config.js

@@ -3,9 +3,9 @@ var xtend = require('xtend')
 var setPrototypeOf = require('setprototypeof')
 
 var CJSParser = acorn.Parser
-  .extend(require('./lib/class-fields'))
-  .extend(require('./lib/static-class-features'))
-  .extend(require('./lib/numeric-separator'))
+  .extend(require('./lib/acorn-class-fields'))
+  .extend(require('./lib/acorn-static-class-features'))
+  .extend(require('./lib/acorn-numeric-separator'))
   .extend(defaultOptionsPlugin)
 var ESModulesParser = CJSParser