Monorepo bundling broken.

[rodeyseijkens]

I was looking through a lot of commits, PRs etc and see that there has been some work-ish done on monorepo support.

Now I have a project that is similar to the https://github.com/vercel/next-forge monorepo with apps/* and packages/*

Now I run into a issue where packages are inheriting from each other example
packages/ai uses a package from packages/next-config/env-types

It looks like the bundler only works on app level and not looking into sublevel tsconfig settings?
Because its totally wrong when it tries to resolve the paths.

Discovering workflow directives 1110ms
Created steps bundle 69ms
✘ [ERROR] Could not resolve "../../../../packages/n
ext-config/env-types"

    ../../packages/ai/keys.ts:2:25:
      2 │ ...from "../../../../packages/next-con...
        ╵         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: Build failed with 1 error:
../../packages/ai/keys.ts:2:25: ERROR: Could not res
olve "../../../../packages/next-config/env-types"
    at new Promise (<anonymous>) {
  errors: [Array],
  warnings: []
}

Originally posted by @rodeyseijkens in #388

[hdsuperman]

[nitro 10:52:10 PM] ERROR RollupError: "../serialization.js" is imported as an external by "../../node_modules/.pnpm/@workflow+core@4.0.1-beta.19_@aws-sdk+client-sts@3.621.0_@opentelemetry+api@1.9.0/node_modules/@workflow/core/dist/step/writable-stream.js", but is already an existing non-external module id.

turporepo build error

[haydenbleasel]

Preface: I was originally getting a bundling error due to @workflow/swc-plugin not being found so i installed it as a direct dependency.

Setup

• Turborepo monorepo with apps/app (Next.js) and packages/backend
• tsconfig paths: "@repo/*": ["../../packages/*"]
• Workflow files import from workspace packages: import { Prisma } from "@repo/backend/database"

Error

The SWC plugin transforms @repo/backend/database to a relative path, but calculates the wrong depth:

app/api/cron/lint/lint-repo.ts:1:23: ERROR: Could not resolve "../../../../../../packages/backend/database"

The file is at apps/app/app/api/cron/lint/lint-repo.ts. The relative path should be ../../../../packages/backend (4 levels up), not 6 levels.

Creating a bridge file without "use workflow" does NOT work:

// apps/app/lib/prisma.ts (no "use workflow" directive)
export { Prisma } from "@repo/backend/database";

The plugin still transforms imports in files that are dependencies of workflow files, not just workflow files themselves.

Real npm packages don't get transformed by the plugin.

Environment

• workflow: 4.0.1-beta.37
• @workflow/swc-plugin: 4.0.1-beta.12
• Next.js 16.1.1 with Turbopack
• Vercel deployment