webpack.config.js

const path = require('path');
const webpack = require('webpack');
const TerserPlugin = require('terser-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
module.exports = {
  mode: 'production',
  target: 'node',
  devtool: 'source-map',
  node: false,
  entry: './src/cli.js',
  output: {
    globalObject: 'this',
    path: path.resolve(__dirname, 'bin'),
    filename: 'graphql-testkit.js',
    library: 'graphql-testkit',
    libraryTarget: 'umd'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/, // Transform all .js and .jsx files required somewhere with Babel
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      }
    ]
  },
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'react',
      root: 'react'
    }
  },
  optimization: {
    usedExports: true,
    providedExports: true,
    minimizer: [
      new TerserPlugin({
        parallel: true,
        terserOptions: {
          // https://github.com/webpack-contrib/terser-webpack-plugin#terseroptions
        }
      })
    ]
  },
  plugins: [
    new CopyPlugin({
      patterns: [{ from: './node_modules/shelljs/src/exec-child.js', to: '' }]
    }),
    new webpack.EnvironmentPlugin({
      NODE_ENV: 'production'
    }),
    new webpack.BannerPlugin({ banner: '#!/usr/bin/env node', raw: true })
  ],
  resolve: {
    modules: ['node_modules', 'app'],
    mainFields: ['jsnext:main', 'main']
  }
};