Webpack with UglifyJs3 / Harmony for ES6 optimization. Tested with:

• webpack 2.5.1
• uglify-es 3.0.10

This package always was and still is a dirty workaround to get you started with uglify-es. The original package over at webpack-contrib/uglifyjs-webpack-plugin now features support for uglify-es in the latest beta, so I would recommend you to switch back to them as soon as possible, as they feature tests and a far more complete implementation.

npm install uglify-es-webpack-plugin or yarn add uglify-es-webpack-plugin

// webpack.config.js

const UglifyEsPlugin = require('uglify-es-webpack-plugin');

if (process.env.NODE_ENV === 'production') {
    module.exports.devtool = 'source-map';

    module.exports.plugins = (module.exports.plugins || []).concat([
        new UglifyEsPlugin({ uglify-es options })
    ]);
}

Supports source maps using devtool = 'source-map' - others untested.

Make sure to not use -p anymore, as it will try to use the built-in UglifyJs plugin. Use

NODE_ENV='production' webpack --progress

or the --env flag to set up your webpack configuration.

• does not keep comments
• no caching or other optimizations
• error handling is untested and minimal