webpack.config.js

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

module.exports = {
  entry: "./client/index.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "build"),
    publicPath: "/build",
  },
  mode: process.env.NODE_ENV,
  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env", "@babel/preset-react"],
          },
        },
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          "style-loader",
          // Translates CSS into CommonJS
          "css-loader",
          // Compiles Sass to CSS
          "sass-loader",
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: "Development",
      template: path.resolve(__dirname, "./index.html"),
    }),
  ],
  devServer: {
    static: {
      directory: path.resolve(__dirname, "build"),
      publicPath: "/",
    },
    proxy: {
      "/": "http://localhost:3000",
    },
    historyApiFallback: true,
  },
};