This is no longer maintained. Please use https://www.npmjs.com/package/rollup-plugin-terser instead.
Compress JavaScript with Butternut.
npm install --save-dev rollup-plugin-butternut// rollup.config.js
import butternut from 'rollup-plugin-butternut';
export default {
entry: 'src/main.js',
dest: 'bundle.js',
format: 'iife',
plugins: [ butternut() ]
};