Hi,

I have a monorepo setup:

1
repo 
2
  - package.json
3
  - BUILD.bazel
4
  - source/
5
    - frontend/
6
      - BUILD.bazel
7
      - next.config.js
8
      - app/
9
        - page.tsx
10
        - layout.tsx
11
        - BUILD.bazel

I manage to build this using bazel and run it locally without issues (e.g. bazel run source/frontend:next). I can also build the project fine: bazel build source/frontend:next builds fine and creates a .next folder under bazel-bin/source/frontend/.next. This is all expected and working fine.

The problem is when I try to deploy this to vercel. I want to build locally and deploy the prebuilt artifacts, so my plan is to do vercel build --prod && vercel deploy --prebuilt --prod

However, I am having trouble deploying the right files to vercel. My project.json file looks like this:

1
{
2
  "projectId": "...",
3
  "orgId": "...",
4
  "settings": {
5
    "createdAt": 1728198914318,
6
    "framework": "nextjs",
7
    "devCommand": null,
8
    "installCommand": "",
9
    "buildCommand": "bazel build //source/frontend:next",
10
    "outputDirectory": "bazel-bin/source/frontend/.next",
11
    "rootDirectory": null,
12
    "directoryListing": false,
13
    "nodeVersion": "20.x"
14
  }
15
}

The buildCommand executes and is successful, but the CLI then fails with Cannot find module 'next/dist/server/next-server.js'. I tried adding this next folder in many places (under .vercel/builders/node_modules, as a first level dir under the root, inside source/frontend, etc. - but to no avail). If I change the rootDirectory to be source/frontend, then I won't have access to the build output, since bazel puts it into bazel-bin, two layers above the source/frontend dir - and from the docs, it looks like you cannot access anything upstream of the root dir, not even using .. to navigate back.

If I change framework choice to other, then vercel build command finishes successfully and the project is deployed to vercel, vercel does not run it properly (it raises a 404 Error - presumably because the files are not in the right format).

Ok so what is the solution here? How does one deploy a pre-build .next folder to vercel using the CLI ?