Monorepo Scaffold

Monorepo Scaffold

Convert a single-app repository into a Turborepo + pnpm workspace monorepo, without breaking builds or release flow.

Purpose

• Standardize on pnpm workspaces + turbo
• Split runnable apps into apps/
• Move shared code and config into packages/
• Add reliable caching, fast CI, and clear ownership boundaries

Target Structure

Use this shape unless the repo already has stronger constraints.

.
├─ apps/
│  ├─ web/
│  ├─ mobile/
│  └─ api/
├─ packages/
│  ├─ shared/
│  ├─ ui-web/
│  ├─ ui-mobile/
│  └─ config/
├─ pnpm-workspace.yaml
├─ turbo.json
└─ package.json

CLI Commands

Prefer explicit, reproducible commands.

# Workspace baseline
pnpm add -D turbo
pnpm install

# Optional: scaffold common layout quickly
pnpm dlx create-turbo@latest --package-manager pnpm

# Run tasks
pnpm turbo run build
pnpm turbo run dev --filter=web
pnpm turbo run test --continue

Workflow

Follow this order. Keep diffs small and reversible.

1. Audit current scripts, build outputs, and deploy entrypoints.
2. Create apps/ and packages/ folders.
3. Move the existing app into apps/<name>/ with minimal edits.
4. Add pnpm-workspace.yaml and include apps/* and packages/*.
5. Add root turbo.json with a small, strict pipeline.
6. Normalize scripts so each app/package exposes build, dev, lint, test, and typecheck when relevant.
7. Extract shared code into packages/shared and wire via workspace deps.
8. Extract shared config into packages/config and reference it explicitly.
9. Update CI to run pnpm install then pnpm turbo run build lint test typecheck.
10. Verify with targeted filters, then full pipeline.

Verification Checklist

Do not trust the migration until all checks pass.

• pnpm install completes without hoist hacks
• pnpm turbo run build succeeds from repo root
• pnpm turbo run dev --filter=<app> starts the expected app
• Each app builds from a clean checkout
• Shared packages are consumed via workspace:* ranges
• Outputs are declared in turbo.json for cache hits
• CI runs from root and matches local commands

References

• Setup guide: skills/monorepo-scaffold/references/turborepo-setup.md
• Migration checks: skills/monorepo-scaffold/references/migration-checklist.md