Debugging Node adapter - production build complains on imported packages

[PlkMarudny]

I have a SvelteKit application that does not work after build. It is supposed to be run in a container, Node driver. At one of the server endpoints I use bullmq client, which, when hit, produces an error:

gui  | ReferenceError: module is not defined in ES module scope
gui  | This file is being treated as an ES module because it has a '.js' file extension and '/app/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
gui  |     at getPkgJsonDir (file:///app/build/server/chunks/_server-DJYoxZ8R.js:47284:40)
gui  |     at new ScriptLoader (file:///app/build/server/chunks/_server-DJYoxZ8R.js:46970:25)
gui  |     at file:///app/build/server/chunks/_server-DJYoxZ8R.js:47336:1
gui  |     at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
gui  |     at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)
gui  |     at async respond (file:///app/build/server/index.js:3524:22)
gui  |     at async Array.ssr (file:///app/build/handler.js:1243:3)

During development I also use Node driver, and a preview served from build directory seems to be working fine. How to debug this?

[leoj3n]

@PlkMarudny Have you tried looking at the code in the files on the lines specified? I don't think this is an issue with bullmq. It sounds like maybe the package.json is different on dev than in production, or your node driver is configured different locally than in remote.

[PlkMarudny]

Well, I solved it. Moving bullmq package from dev dependencies to dependencies was the solution.