Turborepo modules not found when deploying with Vercel with pnpm as package manager

[michaelaflores]

Summary

We recently upgraded our NextJS to App Router, in an existing build that had been using Pages Router. Due to some dependency resolution issues under npm, we switched our package manager to pnpm. When running turbo build locally, the build succeeds. On Vercel, the build errors with Could not resolve "<package-name>", referring to imports of packages listed in the packages directory and referred to in the app's package.json as e.g. "<package-name>": "workspace:*". This preview build has the following vercel.json to override the npm-specific commands we were using before:

{
  "installCommand": "pnpm install",
  "buildCommand": "turbo build"
}

The error only occurs in a post-install script, which seems to have trouble resolving the dependencies only in the Vercel build.

Additional information

"turbo": "^2.4.4",
"packageManager": "[email protected]"

Example

No response

[LikeDreamwalker]

Same issue here

[followbl]

try setting ENABLE_EXPERIMENTAL_COREPACK=1 your env vars in vercel, this enables you to use pnpm 10 not 9

[LikeDreamwalker]

Well I solved it by using the turbo run build to build in vercel project, rather than the default build script, this is especially imporant if your project was not the turborepo based, like a pure Next.js project.

And another case is if your vercel.json file have builds part, it won't use your project setting about build scripts, so you should also handle your build script well.