If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:
npm install grunt-es3ify --save-dev
es3ify property in your grunt configuration file. It supports the common used globbing
or the plugin throws an exception.
options.readOnly (Boolean, default: false)
Shows in the console what will be transformed and where is the destination without any write operations.