Next.js: next/config not working on custom server

[JonathanWbn]

Bug report

Describe the bug

When using next.js with a custom-server, publicRuntimeConfig is undefined in the client.

To Reproduce

Check the logs on these Codesandboxes:
Working without a server: hello-world
Not working with a custom server: custom-server-express

Expected behavior

publicRuntimeConfig to be as set in next.config.js.

System information

• Version of Next.js: 7.0.2

What am I missing here? Is getConfig not supposed to work with a custom server? What would be the alternative?

[timneutkens]

This example works fine when clicking both console and terminal though https://codesandbox.io/s/rr1v861l2p

[JonathanWbn]

Urgh, my bad. Thanks.

[ghost]

I can't access the sandbox anymore, can someone post the solution?

[adamsoffer]

Hey @timneutkens ! I'm also running into this issue where getConfig() returns an empty object when running a custom express server. Do you remember what the solution was?

[timneutkens]

it holds state in a singleton, the only reason it wouldn't work is if you have duplicated next inside node_modules or something 🤔

[adamsoffer]

Hmm yeah that's a possibility. I ended up going with Now build env and secrets instead and this library for dev. Works like a charm.