webpack.config.js

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

module.exports = {
  entry: './src/index.ts',

  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index_bundle.js',
  },
  mode: 'production',
  devtool: 'source-map',
  resolve: {
    extensions: ['.ts', '.tsx', '.js'],
  },

  module: {
    rules: [
      {
        test: /\.ts(x?)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'ts-loader',
          },
        ],
      },
      // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
      {
        enforce: 'pre',
        test: /\.js$/,
        loader: 'source-map-loader',
      },
    ],
  },

  // When importing a module whose path matches one of the following, just
  // assume a corresponding global variable exists and use that instead.
  // This is important because it allows us to avoid bundling all of our
  // dependencies, which allows browsers to cache those libraries between builds.

  devServer: {
    port: 9000,
  },

  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
    }),
    new webpack.ProvidePlugin({
      React: 'react',
    }),
  ],
}