getPlugins.js

const getPlugins = env =>
  [
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: path.join(__dirname, "public/index.html"),
      inject: true,
      chunks: ["app", "vendors"]
    }),
    env.analyze && new BundleAnalyzerPlugin(),
    new MiniCssExtractPlugin({
      filename: env.NODE_ENV === "development" ? "[name].css" : "css/[name].[chunkhash:8].css"
    }),
    env.NODE_ENV === "development" && new webpack.HotModuleReplacementPlugin()
  ].filter(plugin => plugin);