webpack.config.js

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')

const isDevelopment = process.env.NODE_ENV === 'development'

module.exports = {
  mode: isDevelopment ? 'development' : 'production',
  entry: './src/index.js',
  output: {
    path: path.join(__dirname, 'dist'),
    filename: isDevelopment ? '[name].js' : '[name].[hash].js',
    publicPath: '/',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'eslint-loader'],
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx'],
    modules: [path.resolve(__dirname, 'src'), 'node_modules'],
    alias: {
      'react-dom': '@hot-loader/react-dom',
    },
  },
  devServer: {
    contentBase: './dist',
    historyApiFallback: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new CleanWebpackPlugin(),
  ],
  devtool: isDevelopment ? 'eval-source-map' : 'source-map',
}