Vercel CLI built Preview works, but Production won't

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1

Problem Definition

I have a NestJS app, that does static file serving. I have been using Vercel CLI to build and deploy.

When I build and deploy using those commands, it works perfectly fine:

vercel build
vercel deploy --prebuilt

Deployed Preview link: https://stardew-save-analyzer-3surl9ulc-igoodies-projects.vercel.app/

However, when I build for Production via those commands:

vercel build --prod
vercel deploy --prebuilt --prod

It fails with 500 “The Serverless Function has crashed”.
Deployed Production link: https://stardew-save-analyzer.vercel.app/

Logs From Production

Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@nestjs/core' imported from /var/task/dist/server/index.mjs
    at packageResolve (node:internal/modules/esm/resolve:858:9)
    at moduleResolve (node:internal/modules/esm/resolve:931:18)
    at moduleResolveWithNodePath (node:internal/modules/esm/resolve:1173:14)
    at defaultResolve (node:internal/modules/esm/resolve:1216:79)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:542:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:510:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:239:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:96:40)
    at link (node:internal/modules/esm/module_job:95:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.
Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@nestjs/core' imported from /var/task/dist/server/index.mjs
    at packageResolve (node:internal/modules/esm/resolve:858:9)
    at moduleResolve (node:internal/modules/esm/resolve:931:18)
    at moduleResolveWithNodePath (node:internal/modules/esm/resolve:1173:14)
    at defaultResolve (node:internal/modules/esm/resolve:1216:79)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:542:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:510:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:239:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:96:40)
    at link (node:internal/modules/esm/module_job:95:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.

I wonder how is this not the case with the Preview build, but crashes with a simple package not found issue in Production. I appreciate any help or insight that I might be missing in advance!

Project Information

It is an Open Source Project, you can check out the code: GitHub - CoconutGoodie/stardew-save-analyzer: 🌿 Save Analyzer & Tracker for Stardew Valley the Game
It uses Vike with NestJS backend, which serves static frontend files.

2

Have you tried to adjust your project’s Build & Development Settings and try to deploy it using vercel deploy --prod (without the --prebuilt flag)? So the project is built on Vercel’s servers. At least the output of the build there could help you to debug your issue further.

1 Like
3

Yes I also tried deploying with:

vercel deploy --prod

Unfortunately the output is the same. Serverless Function crashes with the same log

4

What CLI version are you using?

If it’s not already updated to the latest version (currently 39.3.0), please run npm i -g vercel@latest to update it and try the production deployment again with that version :pray:

1 Like
5

I am using v39.3.0 already :frowning_face:

image

6

Thanks for confirming that. I took a look through the repo and noticed that the vercel.json has builds and routes configured for the dist/server/index.mjs path. That setup could be the cause of the missing package error.

There are a few articles written about how to deploy a NestJS app with Vercel. I find How to deploy your NestJS apps on Vercel - DEV Community and Deploying a NestJS Application on Vercel with a PostgreSQL Database - DEV Community particularly helpful. I recommend following their project setup.

If you give that a try, please let us know how it goes

7

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