webpack.config.js

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

module.exports = [
  {
    mode: process.env.NODE_ENV || "development",
    entry: "./source/server/index.js",
    target: "node",
    externals: [
      WebpackNodeExternals()
    ],
    output: {
      path: path.resolve(__dirname, "tmp"),
      filename: "server.js",
      libraryTarget: "commonjs2"
    },
    module: {
      rules: [
        {
          test: /index\.js$/,
          exclude: /node_modules/,
          use: {
            loader: "babel-loader",
          }
        }
      ]
    }
  },
]