Minify a package using webpack2

Is it possible to minify my package file and all modules used. I am using import in javascript, but want webpack to minify all imported js files. This means removing all unused code from imported external libraries. It is possible. Especially plot is a really big library, but I only use pie charts. I don't think my package requires all the code from the conspiracy. Here is my webpack config file:

const path              = require('path');
const webpack           = require('webpack');
const UglifyJSPlugin    = require('uglifyjs-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const config = {
    entry: 
    {
        cash: './js/page/cash.js'
    },
    output: 
    {
        filename: "[name].bundle.js",
        path: path.resolve(__dirname, 'dist')
    },
    resolve: 
    {
        modules: [
            path.resolve(__dirname, 'js')
        ],
        alias : {
            knockout: path.resolve(__dirname, 'js/knockout-3.4.2.js'),
            moment: path.resolve(__dirname,'js/moment.js')
        }
    },
    module: 
    {
        rules: [
            {
                test: /\.js$/, 
                use: 'babel-loader'
            }
        ]
    },
    plugins: [
        new webpack.LoaderOptionsPlugin({
            minimize: true
        }),
        new UglifyJSPlugin({ 
            comments: false,
            sourceMap: false,
            compress: {
                unused: true,
                dead_code: true,
                warnings: false,
                drop_debugger: true,
                conditionals: true,
                evaluate: true,
                drop_console: true,
                sequences: true,
                booleans: true
            },
            mangle: true
        }),
        new webpack.optimize.AggressiveMergingPlugin(),
        new webpack.optimize.OccurrenceOrderPlugin()
    ]
};

module.exports = config;