webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  mode: 'development',
  devtool: 'inline-source-map',
  entry: './index.js',
  output: {
    path: path.join(__dirname, '/build'),
    publicPath: '/',
    filename: '[name].js'
  },
  optimization: {
    splitChunks: {
      chunks: 'all'
    }
  },
  devServer: {
    historyApiFallback: true,
    contentBase: './build'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader'
          },
          {
            loader: 'eslint-loader',
            options: {
              formatter: require('eslint/lib/cli-engine/formatters/stylish')
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'index.html'
    }),
    new HtmlWebpackPlugin({
      filename: '200.html',
      template: 'index.html'
    }),
    new BundleAnalyzerPlugin({
      analyzerMode: 'disabled',
      generateStatsFile: true,
      statsOptions: { source: false },
      statsFilename: path.join(__dirname, 'stats/stats.json')
    })
  ],
  resolve: {
    extensions: ['.js', '.jsx']
  },
  performance: { hints: false }
};