webpack.config.js

const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')

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