webpack.config.js

// @flow
"use strict";

const path = require("path");
const webpack = require("webpack");
const nodeExternals = require("webpack-node-externals");
module.exports = {
	entry: {
		server: "./src/index.js",
	},
	output: {
		path: path.join(__dirname, "dist"),
		publicPath: "/",
		filename: "index.js"
	},
	target: "node",
	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: [
			{
				// Transpiles ES6-8 into ES5
				test: /\.js$/,
				exclude: /node_modules/,
				use: {
					loader: "babel-loader"
				}
			},
			{
				// Transpiles ES6-8 into ES5
				test: /\.js$/,
				exclude: /node_modules/,
				enforce: "pre",
				use: ["remove-flow-types-loader"],
				include: path.join(__dirname, "src")
			}
		]
	}
};