This is a nodejs crud boilerplate I created many years ago to demontrate Continuous Integration and Deployment (CI/CD) plus many other things.
It has a Heroku example where the node app is automatically pushed to heroku. See the heroku section abouit half way down the readme.
It’s not threejs, but it is a minimal nodejs/npm app that you can cherry pick from or use for reference…
In my Heroku projects setting → Deploy tab → “App connected to Github”, it points to my GitHub repository. It is also setup for auto deploy when I push changes to the master branch on my GitHub repo.
In my code repository, the file that matters to Heroku is the app.json
Your package.json should also have a start script in the scripts section that starts your node server.
eg,
"scripts": {
"start": "node ./dist/server.js",
"test": "echo tests"
}
If you are interested in dockerising your app or using docker-compose with GitLab CI, then you can also find info in there since that was the original purpose of this tutorial.