webpack.config.js

const path = require('path')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

const isProduction = process.env.NODE_ENV === 'production'

module.exports = {
  entry: './src/index.jsx',
  output: {
    path: path.join(__dirname, '/dist'),
    publicPath: '',
    filename: '[name].js',
    globalObject: 'this',
  },
  devtool: isProduction ? undefined : 'eval-source-map',
  optimization: {
    splitChunks: {
      chunks: 'all',
    },
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              sourceMap: true,
              modules: {
                localIdentName: '[name]__[local]__[hash:base64:5]',
              },
            },
          },
        ],
      },
    ],
  },
  plugins: [
    ...isProduction ? [new CleanWebpackPlugin()] : [],
    new CopyWebpackPlugin([{ from: 'public', to: '' }]),
    new HtmlWebpackPlugin({
      template: 'src/index.html',
      favicon: 'images/favicon.ico',
    }),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css',
    }),
  ],
  resolve: {
    extensions: ['.js', '.jsx'],
  },
}