webpack.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');

module.exports = {
  mode: process.env.NODE_ENV || 'development',
  target: 'node',
  entry: {
    server: './server/index.ts',
  },
  output: {
    path: path.join(__dirname, 'dist'),
    publicPath: '/',
    filename: '[name].js',
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js', '.jsx'],
  },
  node: {
    // Need this when working with express, otherwise the build fails
    __dirname: false, // if you don't put this is, __dirname
    __filename: false, // and __filename return blank or /
  },
  externals: [nodeExternals()], // Need this to avoid error when working with Express
  module: {
    rules: [
      {
        test: /\.ts(x?)$/,
        exclude: /node_modules/,
        use: ['ts-loader'],
      },
      {
        test: /\.js(x?)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              require.resolve('@babel/preset-react'),
              require.resolve('@babel/preset-env'),
              require.resolve('@babel/preset-typescript'),
            ],
          },
        },
      },
    ],
  },
};