webpack.config.js

const path = require('path');
const HTMLWebpackPlugin = require('html-webpack-plugin');
const config = require('config');

module.exports = {
  // webpack optimization mode
  mode: process.env.NODE_ENV ? process.env.NODE_ENV : 'development',

  // entry file(s)
  entry: './src/index.js',

  // output file(s) and chunks
  output: {
    library: 'UserList',
    libraryTarget: 'umd',
    libraryExport: 'default',
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    publicPath: config.get('publicPath'),
  },

  // module/loaders configuration
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: ['babel-loader'],
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'postcss-loader', 'sass-loader'],
      },
    ],
  },

  plugins: [
    new HTMLWebpackPlugin({
      template: path.resolve(__dirname, 'index.html'),
    }),
  ],

  // development server configuration
  devServer: {
    // must be `true` for SPAs
    historyApiFallback: true,

    // open browser on server start
    open: config.get('open'),
  },

  // generate source map
  devtool: 'production' === process.env.NODE_ENV ? 'source-map' : 'cheap-module-eval-source-map',
};