webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CleanWebpackPlugin = require("clean-webpack-plugin");

const outputDirectory = "dist";
module.exports = {
  entry: "./src/client/index.js",

  output: {
    path: path.join(__dirname, outputDirectory),
    filename: "[name].[hash].js",
    publicPath: "/"
  },

  mode: "development",
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.(scss)$/,
        use: ["style-loader", "css-loader", "sass-loader"]
      },

      {
        test: /\.mjs$/,
        include: /node_modules/,
        type: "javascript/auto"
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(["dist"], { watch: true }),
    new HtmlWebpackPlugin({
      template: "./public/index.html",
      favicon: "./public/favicon.ico"
    })
  ],
  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          name: "vendors",
          chunks: "all"
        }
      }
    }
  }
};