webpack.config.store.js

const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: {
    app: ['babel-polyfill', './src/store/client/index.js'],
    theme: ['theme']
  },
  
  performance: {
    hints: false
  },

  output: {
    publicPath: '/',
    path: path.resolve(__dirname, 'theme'),
    filename: 'assets/js/[name]-[chunkhash].js',
    chunkFilename: 'assets/js/[name]-[chunkhash].js'
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendor: {
          chunks: 'initial',
          name: 'theme',
          test: 'theme',
          enforce: true
        },
      }
    }
  },

  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      }, {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
                modules: false,
                importLoaders: true
            }
          }
        ]
      },
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          "css-loader",
          "sass-loader"
        ]
      }
    ]
  },

  plugins: [
    new MiniCssExtractPlugin({
      filename: "assets/css/bundle-[contenthash].css",
      chunkFilename: "assets/css/bundle-[contenthash].css"
    }),
    new HtmlWebpackPlugin({
      template: 'theme/index.html',
      inject: 'body',
      filename: 'assets/index.html'
    }),
    new webpack.BannerPlugin({
      banner: `Created: ${new Date().toUTCString()}`,
      raw: false,
      entryOnly: false
    })
  ]
};