NextJS cookie-parser middleware absent from production build - node.js

Question

I'm developing a NextJS application and have been using npm run dev during the development process. Now I'm trying to do a production build as described on the GitHub page.
My app blows up in production mode; it seems the cookie-parser node middleware is not installed in the production build? Here is how I set it up:
server.js
const express = require('express');
const next = require('next');
const cookieParser = require('cookie-parser'); // require cookie-parser
const dev = process.env.NODE_ENV !== 'production';
const app = next({ dev });
const handle = app.getRequestHandler();
app.prepare()
.then(() => {
const server = express();
server.use(cookieParser()); // use cookieParser
server.get('*', (req, res) => {
return handle(req, res);
});
server.listen(3000, (err) => {
if (err) throw err;
console.log('> Ready on http://localhost:3000');
});
})
.catch((ex) => {
console.error(ex.stack);
process.exit(1);
})
Later in the code I access the node req object. In development mode req.cookies is present as I would expect. In production mode it's absent.
It looks like there is no server.js file in the production build directory. What's more, grepping for cookie-parser and cookieParser in said production build directory yields empty results.
Any idea what's going on and how to get cookie-parser working in a production NextJS build?

Answer 1

Found the answer on the same GitHub page.
When using a custom server with a server file, for example called
server.js, make sure you update the scripts key in package.json to:
{
"scripts": {
"dev": "node server.js",
"build": "next build",
"start": "NODE_ENV=production node server.js"
}
}
One problem with the production build down!