Minifty ES2015 code without needing transpilation to ES5.
$ npm install --save-dev babel-preset-minify-es2015
.babelrc
{
"presets": ["minify-es2015"]
}
$ babel script.js --presets minify-es2015
require('babel-core').transform('code', {
presets: ['minify-es2015']
});