webpack.prod.config.js

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

const client = {
  entry: './client/index.js',
  output: {
    path: path.resolve(__dirname, 'client-dist'),
    filename: 'client-bundle.js'
  },
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
    ]
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    new CopyWebpackPlugin([
      { from: './client/assets', to: 'assets' },
    ]),
  ]
};

const server = {
  entry: './index.js',
  output: {
    path: path.resolve(__dirname, 'server-dist'),
    filename: 'server-bundle.js'
  },
  mode: 'production',
  target: 'node',
  externals: [nodeExternals()],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: require.resolve('babel-loader')
        }
      },
      {
        test: /\.graphql$/,
        exclude: /node_modules/,
        use: {
          loader: 'raw-loader'
        }
      }
    ]
  },
};

module.exports = [client, server];