typescript-monorepo— agent skill

TypeScript Monorepo Workflow Guidance

Install Commands

• Workspace-scoped install runs from workspace root, not leaf
• bun: bun install at workspace root
• pnpm: pnpm install at workspace root
• npm: npm ci at workspace root
• working_directory = workspace root (repo-relative)

Workspace Root Discovery

• If workspace_root is present, use it as the direct hint for workspace-owned commands
• If workspace_root is missing but provenance is inherited, walk upward from codebase_path to find the nearest owning workspace root
• Inspect parent directories one level at a time with absolute paths using get_directory_tree and read_file_content
• Stop when you find the nearest workspace-owned signals such as pnpm-workspace.yaml, a root package.json with workspaces, a lockfile, turbo.json, or nx.json
• Do not assume the leaf owns install/build commands just because the exact workspace root was not precomputed

Build Commands

• Turborepo: turbo run build or bun run build at workspace root
• Individual: bun run build --filter <package> from workspace root
• Check turbo.json or nx.json for build pipeline configuration
• working_directory = workspace root

Test/Lint/TypeCheck Commands

• Usually leaf-specific: run from codebase root (omit working_directory)
• Some monorepos configure workspace-level lint/test via turbo.json/nx.json
• Inspect the leaf's package.json scripts section for available commands

Working Directory Rules

• working_directory = workspace root for install/build commands
• working_directory = omit (None) for leaf-local test/lint/type_check
• working_directory = "." when command must run from repository root
• If both workspace-level and leaf-level commands exist for same stage, emit both with distinct working_directory

Config File Path Rules

• config_file must always be repository-root-relative
• Never use absolute paths in config_file
• Never use codebase-relative .. segments in config_file
• For workspace-owned configs above the leaf, emit the full repository-root path, for example:
• infra/services/turbo.json
• infra/services/pnpm-workspace.yaml

Upward Discovery Example

• Given codebase_path = /opt/unoplat/repositories/acme/infra/services/apps/api and inherited provenance with no workspace_root
• Inspect /opt/unoplat/repositories/acme/infra/services/apps/api, then /opt/unoplat/repositories/acme/infra/services/apps, then /opt/unoplat/repositories/acme/infra/services
• If /opt/unoplat/repositories/acme/infra/services/pnpm-workspace.yaml exists, use repo-relative infra/services as the workspace root
• Then emit workspace-owned commands like install/build with working_directory = "infra/services"

Package Manager Inheritance

• Leaf inherits manager from nearest workspace aggregator
• Commands use the inherited manager's CLI (bun, pnpm, npm, yarn)
• Lock files live at workspace root, not leaf
• If leaf has its own local manager, provenance=local and no workspace root