grunt-buble 
the blazing fast, batteries-included ES2015 compiler Bublé
Install
$ npm install --save-dev grunt-buble
Usage
require('load-grunt-tasks')(grunt); // npm install --save-dev load-grunt-tasks
grunt.initConfig({
buble: {
options: {
sourceMap: true
},
dist: {
files: {
'dist/app.js': 'src/app.js'
}
}
}
});
grunt.registerTask('default', ['buble']);Options
See the Bublé options