timmy-tower/replit.md

Workspace

Overview

pnpm workspace monorepo using TypeScript. Each package manages its own dependencies.

Stack

• Monorepo tool: pnpm workspaces
• Node.js version: 24
• Package manager: pnpm
• TypeScript version: 5.9
• API framework: Express 5
• Database: PostgreSQL + Drizzle ORM
• Validation: Zod (zod/v4), drizzle-zod
• API codegen: Orval (from OpenAPI spec)
• Build: esbuild (CJS bundle)

Structure

artifacts-monorepo/
├── artifacts/              # Deployable applications
│   └── api-server/         # Express API server
├── lib/                    # Shared libraries
│   ├── api-spec/           # OpenAPI spec + Orval codegen config
│   ├── api-client-react/   # Generated React Query hooks
│   ├── api-zod/            # Generated Zod schemas from OpenAPI
│   └── db/                 # Drizzle ORM schema + DB connection
├── scripts/                # Utility scripts (single workspace package)
│   └── src/                # Individual .ts scripts, run via `pnpm --filter @workspace/scripts run <script>`
├── pnpm-workspace.yaml     # pnpm workspace (artifacts/*, lib/*, lib/integrations/*, scripts)
├── tsconfig.base.json      # Shared TS options (composite, bundler resolution, es2022)
├── tsconfig.json           # Root TS project references
└── package.json            # Root package with hoisted devDeps

TypeScript & Composite Projects

Every package extends tsconfig.base.json which sets composite: true. The root tsconfig.json lists all packages as project references. This means:

• Always typecheck from the root — run pnpm run typecheck (which runs tsc --build --emitDeclarationOnly). This builds the full dependency graph so that cross-package imports resolve correctly. Running tsc inside a single package will fail if its dependencies haven't been built yet.
• emitDeclarationOnly — we only emit .d.ts files during typecheck; actual JS bundling is handled by esbuild/tsx/vite...etc, not tsc.
• Project references — when package A depends on package B, A's tsconfig.json must list B in its references array. tsc --build uses this to determine build order and skip up-to-date packages.

Root Scripts

• pnpm run build — runs typecheck first, then recursively runs build in all packages that define it
• pnpm run typecheck — runs tsc --build --emitDeclarationOnly using project references

Packages

artifacts/api-server (@workspace/api-server)

Express 5 API server. Routes live in src/routes/ and use @workspace/api-zod for request and response validation and @workspace/db for persistence.

• Entry: src/index.ts — reads PORT, starts Express
• App setup: src/app.ts — mounts CORS, JSON/urlencoded parsing, routes at /api
• Routes: src/routes/index.ts mounts sub-routers; src/routes/health.ts exposes GET /health (full path: /api/health)
• Depends on: @workspace/db, @workspace/api-zod
• pnpm --filter @workspace/api-server run dev — run the dev server
• pnpm --filter @workspace/api-server run build — production esbuild bundle (dist/index.cjs)
• Build bundles an allowlist of deps (express, cors, pg, drizzle-orm, zod, etc.) and externalizes the rest

lib/db (@workspace/db)

Database layer using Drizzle ORM with PostgreSQL. Exports a Drizzle client instance and schema models.

• src/index.ts — creates a Pool + Drizzle instance, exports schema
• src/schema/index.ts — barrel re-export of all models
• src/schema/<modelname>.ts — table definitions with drizzle-zod insert schemas (no models definitions exist right now)
• drizzle.config.ts — Drizzle Kit config (requires DATABASE_URL, automatically provided by Replit)
• Exports: . (pool, db, schema), ./schema (schema only)

Production migrations are handled by Replit when publishing. In development, we just use pnpm --filter @workspace/db run push, and we fallback to pnpm --filter @workspace/db run push-force.

lib/api-spec (@workspace/api-spec)

Owns the OpenAPI 3.1 spec (openapi.yaml) and the Orval config (orval.config.ts). Running codegen produces output into two sibling packages:

1. lib/api-client-react/src/generated/ — React Query hooks + fetch client
2. lib/api-zod/src/generated/ — Zod schemas

Run codegen: pnpm --filter @workspace/api-spec run codegen

lib/api-zod (@workspace/api-zod)

Generated Zod schemas from the OpenAPI spec (e.g. HealthCheckResponse). Used by api-server for response validation.

lib/api-client-react (@workspace/api-client-react)

Generated React Query hooks and fetch client from the OpenAPI spec (e.g. useHealthCheck, healthCheck).

scripts (@workspace/scripts)

Utility scripts package. Each script is a .ts file in src/ with a corresponding npm script in package.json. Run scripts via pnpm --filter @workspace/scripts run <script>. Scripts can import any workspace package (e.g., @workspace/db) by adding it as a dependency in scripts/package.json.