webpack.config.js

const path = require('path');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const CompressionPlugin = require('compression-webpack-plugin');

module.exports = {
    entry: {
        'format-google-calendar': './src/app.js',
        'format-google-calendar.min': './src/app.js'
    },
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: '[name].js'
    },
    module: {
        loaders: [
            {
                test: /\.js$/,
                loader: 'babel-loader',
                query: {
                    presets: ['es2015']
                }
            }
        ]
    },
    stats: {
        colors: true
    },
    devtool: 'source-map',
    devServer: {
        contentBase: './'
    },
    plugins: [
        new webpack.optimize.UglifyJsPlugin({
            include: /\.min\.js$/,
            sourceMap: true,
            parallel: true,
            sourceMap: false
        })
    ]  
};