webpack.config.js

const webpack = require('webpack')
const path = require('path')

module.exports = {
  entry: "./src/index.js",
  mode: "development",
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: { presets: ["@babel/env"] }
      },
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"]
      }
    ],
  },
  resolve: {
    extensions: ["*", ".js", ".jsx"],
  },
  output: {
    path: path.resolve(__dirname, "dist/"),
    publicPath: "/dist/",
    filename: "bundle.js",
  },
  plugins: [new webpack.HotModuleReplacementPlugin()],
  devServer: {
    contentBase: path.join(__dirname, "public/"),
    port: 3000,
    hotOnly: true,
    publicPath: "http://localhost:3000/dist/",
  }
}