webpack.config.js

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

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

const config = {
  mode: isProd ? 'production' : 'development',
  entry: {
    main: {
      import: path.resolve(__dirname, './src/index.tsx'),
      dependOn: 'vendor'
    },
    vendor: ['react', 'react-dom']
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'js/[name].bundle.js',
    libraryTarget: 'umd'
  },
  target: 'web',
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx']
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader'
          },
          {
            loader: 'sass-loader',
            options: {
              sassOptions: {
                includePaths: [require('path').resolve(__dirname, 'node_modules')]
              },
              sourceMap: true
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: 'public/index.html'
    }),
    new MiniCssExtractPlugin({
      filename: 'css/styles.css'
    })
  ]
}

if (isProd) {
  config.optimization = {
    minimizer: [new TerserWebpackPlugin()]
  }
} else {
  config.devServer = {
    port: 3000,
    hot: true
  }
}

module.exports = config