How do I make heroku stop creating a web process for a worker-only app?

Question

I have a simple worker-only app that uses heroku's scheduler to run once per day. However I noticed that I was getting an extra run every time I pushed code and tracked it down to heroku creating a web process, running my worker command (twice!), and then declaring it "crashed" once my worker completes.

My Procfile only has one entry:

worker: npm start

But when I push to heroku, the logs include this little bit:

-----> Discovering process types
       Procfile declares types   -> worker
       Default types for Node.js -> web

What's going on here and how do I disable it?

You can see my complete code at https://github.com/nfriedly/vzw-bot and logs from a recent push at https://travis-ci.org/nfriedly/vzw-bot/builds/83548651

Blanketyblank

See #40266199 – Conspire

Answer 1

I found a solution, running this will disable the default web worker:

heroku ps:scale web=0

The deploy logs still report the default web type, but it doesn't actually spin one up after that.

Blanketyblank

This works, but... is there really no way to override the "default types for buildpack" so it doesn't do a web process at all? – Contrition

I've raised an issue for it here: github.com/heroku/heroku-buildpack-nodejs/issues/335 – Playsuit