webpack.config.js

// contents of webpack.config.js
const path = require('path');
const pkg = require('./package.json');

module.exports = {
  entry: `./src/${pkg.entry}.jsx`,
  externals: {
    '@builder.io/react': '@builder.io/react',
    '@builder.io/app-context': '@builder.io/app-context',
    '@emotion/core': '@emotion/core',
    react: 'react',
    'react-dom': 'react-dom'
  },
  output: {
    filename: pkg.output,
    path: path.resolve(__dirname, 'dist'),
    libraryTarget: 'system'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  module: {
    rules: [
      {
        test: /\.(jsx)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader'
          }
        ]
      }
    ]
  },
  devServer: {
    port: 1268,
    static: {
      directory: path.join(__dirname, './dist')
    },
    headers: {
      'Access-Control-Allow-Private-Network': 'true',
      'Access-Control-Allow-Origin': '*'
    }
  }
};