Vercel CLI path doubling error during prebuilt deployment in Turborepo monorepo

Hey,

I’ve been facing an issue recently during deployment where the vercel cli doubles the root directory which leads to the deployment failing because there’s no path as apps/web/apps/web.

Problem

To describe my flow, my Vercel Project settings are set as follows:

Root Directory: apps/web
Build command: cd ../.. && turbo build

Configuration

Then, here’s my root workspace package.json with the following scripts:

{
  "scripts": {
    "vercel:link": "vercel link --yes --repo",
    "vercel:envs": "turbo run vercel:envs",
    "vercel:build": "turbo run vercel:build",
    "vercel:deploy": "turbo run vercel:deploy"
  }
}

This runs the scripts in the apps/web/package.json which are describe as follows:

{
  "scripts": {
    "vercel:link": "vercel link --yes --repo",
    "vercel:envs": "vercel pull --yes --environment=preview",
    "vercel:build": "vercel build",
    "vercel:deploy": "vercel deploy --prebuilt"
  }
}

The build is created in apps/web/.vercel/output, which is great, but when the vercel:deploy script runs, it appends the root directory again and so the Vercel CLI looks for the output in apps/web/apps/web which obviously doesn’t exist.

I’ve tried using the exact flow locally and it works without any issues, so why is the behavior different on CI/CD? I’ve made sure the versions are the same, and everything else I could possibly think of.

I also tried moving the vercel commands to run from the workspace root, but in that case, the build wouldn’t start unless I provided the --cwd apps/web flag which means I’m back to square one.

Error Output

Here’s an error message of the path doubling:

web:vercel:deploy

cache bypass, force executing 21e867016fb51699

> web@0.1.0 vercel:deploy /home/runner/work/X/X/apps/web

> vercel deploy --prebuilt --token=$VERCEL_TOKEN

Vercel CLI 50.14.0

Retrieving project…

Error: The provided path “~/work/X/X/apps/web/apps/web” does not exist. To change your Project Settings, go to https://vercel.com/X/X/settings

 ELIFECYCLE  Command failed with exit code 1.

Any help in this regard would be really appreciated. If there’s any additional info needed, please do let me know.