starwards/
├── package.json              # Root workspace config
├── modules/
│   ├── core/                 # Game logic, shared types
│   │   ├── src/             # TypeScript source
│   │   ├── cjs/             # Built CommonJS (gitignored)
│   │   └── package.json     # @starwards/core
│   ├── server/              # Colyseus rooms, game server
│   │   ├── src/
│   │   ├── cjs/             # Built server code
│   │   └── package.json     # @starwards/server
│   ├── browser/             # React UI, PixiJS rendering
│   │   ├── src/
│   │   ├── dist/            # Webpack bundle
│   │   └── package.json     # @starwards/browser
│   ├── node-red/            # Node-RED integration
│   │   ├── src/
│   │   ├── dist/
│   │   └── package.json     # @starwards/node-red
│   └── e2e/                 # Playwright tests
│       └── test/
└── node_modules/            # Shared dependencies (hoisted)

Module Dependencies

core (no deps)
  ├─→ server (depends on core)
  ├─→ browser (depends on core)
  ├─→ node-red (depends on core)
  └─→ e2e (depends on all)

Critical: Core must build before others.

Build Commands

From Root Directory

# Build all modules (correct order)
npm run build
# Runs: core → (server, browser, node-red in parallel)

# Build specific module
npm run build:core
npm run build:browser
npm run build:server
npm run build:node-red

# Clean all build artifacts
npm run clean
# Removes: cjs/, dist/ from all modules

# Fresh build
npm run clean && npm run build

From Module Directory

# Build just this module
cd modules/core && npm run build
cd modules/browser && npm run build

# Watch mode (rebuild on file change)
cd modules/core && npm run build:watch

When to use:

Root commands: CI/CD, fresh builds, building everything
Module commands: Active development of that module

Development Workflow (3 Terminals)

Terminal 1: Core Watch Mode

cd modules/core && npm run build:watch

Purpose: Automatically rebuild core when files change

When running: Any time you're editing core/ files

Status: Keep running in background

Troubleshooting:

Not rebuilding? Check console for errors
Server not seeing changes? Core build may have failed

Terminal 2: Webpack Dev Server

cd modules/browser && npm start

Purpose: Hot-reload browser UI

Serves: http://localhost:3000

When running: When developing browser/ UI

Troubleshooting:

Port 3000 taken? lsof -ti:3000 | xargs kill -9
Webpack overlay shows [object Object]? Check browser console (F12)
Changes not appearing? Check if core watch is running

Terminal 3: API Server

node -r ts-node/register/transpile-only modules/server/src/dev.ts

Purpose: Run game server with Colyseus

Serves: http://localhost:8080

When running: Always (browser needs API)

Troubleshooting:

Server crashes? Check if core is built
Changes not appearing? Restart this terminal (server doesn't auto-reload)

Workflow Summary

Start Terminal 1 (core watch)
Start Terminal 2 (webpack dev server)
Start Terminal 3 (API server)
Edit code
Browser auto-reloads (Terminal 2 hot-reload)
Core changes → rebuild (Terminal 1 watches)
Server changes → manually restart Terminal 3

Testing in Monorepo

All Tests

# From root: Run all module tests
npm test
# Runs: core tests, server tests, node-red tests

# Specific module
npm test -- --projects=core
npm test -- --projects=server
npm test -- --projects=node-red

# Specific file
npm test -- modules/core/test/shield.spec.ts

E2E Tests

# E2E tests require ALL modules built
npm run build        # Build everything first
npm run test:e2e     # Then run E2E

# Update snapshots
npm run test:e2e -- --update-snapshots

Why build first: E2E tests start real server, which needs built modules.

Watch Mode During Development

# Watch all tests
npm test -- --watch

# Watch specific module
cd modules/core && npm test -- --watch

Tip: Run in 4th terminal while developing.

Common Workflows

Adding New Core Feature

# 1. Ensure core watch running
cd modules/core && npm run build:watch  # Terminal 1

# 2. Write test (TDD)
# modules/core/test/shield.spec.ts

# 3. Run test (should fail RED)
npm test -- modules/core/test/shield.spec.ts

# 4. Implement feature
# modules/core/src/ship/shield.ts
# (watch rebuilds automatically)

# 5. Test passes GREEN
npm test -- modules/core/test/shield.spec.ts

# 6. Verify dependents still work
npm test                # All tests
npm run test:e2e        # E2E tests

Adding New UI Widget

# 1. Ensure everything running
# Terminal 1: core watch
# Terminal 2: webpack dev server
# Terminal 3: API server

# 2. Write E2E test (TDD)
# modules/e2e/test/shield-widget.spec.ts
npm run test:e2e -- shield-widget.spec.ts  # Fails RED

# 3. Create widget
# modules/browser/src/widgets/shield.ts
# (webpack hot-reloads automatically)

# 4. Test passes GREEN
npm run test:e2e -- shield-widget.spec.ts

# 5. Verify
npm run test:e2e       # All E2E

Adding New Server Feature

# 1. Core watch running (Terminal 1)
# 2. Write test
# modules/server/test/shield-command.spec.ts
npm test -- modules/server/test/shield-command.spec.ts  # RED

# 3. Implement
# modules/server/src/ship/room.ts
npm run build:server

# 4. Restart server (Terminal 3)
# Ctrl+C, then re-run command

# 5. Test passes GREEN
npm test -- modules/server/test/shield-command.spec.ts

# 6. Verify E2E
npm run test:e2e

Build Order & Dependencies

Automatic (from root):

npm run build
# 1. Build core first (required)
# 2. Build server, browser, node-red in parallel

Manual (module by module):

# CORRECT order
npm run build:core       # 1st
npm run build:server     # 2nd (can run parallel with browser)
npm run build:browser    # 2nd (can run parallel with server)
npm run build:node-red   # 2nd (can run parallel with others)

# WRONG order
npm run build:browser  # FAILS - core not built yet
npm run build:core     # Too late

Path Aliases

All modules can import core using @starwards/core:

// In server, browser, or node-red:
import { ShipState } from '@starwards/core';

Configured in:

tsconfig.json (TypeScript)
jest.config.js (Jest tests)
webpack.common.js (Browser webpack)

Maps to:

Development: modules/core/src
Production: modules/core/cjs

Common Pitfalls

Pitfall 1: Core Not Built

Symptom:

Error: Cannot find module '@starwards/core'

Solution:

npm run build:core
# Or start watch mode: cd modules/core && npm run build:watch

Pitfall 2: Server Not Restarted

Symptom: Server code changes not appearing

Solution: Server doesn't auto-reload. Restart Terminal 3:

Ctrl+C
node -r ts-node/register/transpile-only modules/server/src/dev.ts

Pitfall 3: Webpack Not Running

Symptom: Browser changes not appearing

Solution: Start Terminal 2:

cd modules/browser && npm start

Pitfall 4: Build Artifacts Stale

Symptom: Weird errors, imports failing, tests failing randomly

Solution: Fresh build:

npm run clean
npm ci            # Fresh dependencies
npm run build

Pitfall 5: Wrong Directory for npm test

Symptom: Tests not found

Solution: Run from root, not module:

# CORRECT
npm test

# WRONG
cd modules/core && npm test  # Works but limits to core only

Pitfall 6: E2E Without Build

Symptom: E2E tests fail, server doesn't start

Solution:

npm run build      # Build all first
npm run test:e2e   # Then E2E

Pitfall 7: Dependency Version Mismatch

Symptom: "Multiple versions of package X"

Solution:

npm ci            # Use exact versions from package-lock.json
npm dedupe        # Deduplicate dependencies

CI/CD Monorepo Considerations

GitHub Actions workflow:

- run: npm ci                  # Install all workspaces
- run: npm run test:types      # Type check all modules
- run: npm run test:format     # Format check all modules
- run: npm run build           # Build all modules (correct order)
- run: npm test                # Test all modules
- run: npm run test:e2e        # E2E tests (after build)

Order matters: Build must complete before E2E.

Debugging Monorepo Issues

Check Build Status

# Verify all modules built
ls modules/core/cjs          # Should exist
ls modules/browser/dist      # Should exist
ls modules/server/cjs        # Should exist

Check Dependencies

# List workspace dependencies
npm ls @starwards/core      # Who depends on core?

# Check if hoisted correctly
ls node_modules/@starwards  # Should see symlinks

Fresh Start

# Nuclear option - full reset
npm run clean               # Remove build artifacts
rm -rf node_modules         # Remove dependencies
rm package-lock.json        # Remove lockfile
npm install                 # Fresh install
npm run build               # Fresh build

Use when: Everything is broken, nothing makes sense.

Integration with Other Skills

starwards-tdd - Test patterns for each module type
starwards-verification - Commands verify all modules
starwards-debugging - Debug issues across module boundaries

Quick Reference

Action	Command
Build all	`npm run build`
Build core only	`npm run build:core`
Core watch	`cd modules/core && npm run build:watch`
Test all	`npm test`
Test core only	`npm test -- --projects=core`
Clean all	`npm run clean`
Fresh build	`npm run clean && npm ci && npm run build`
Dev workflow	3 terminals: core watch, webpack, server

The Bottom Line

Remember:

Core builds first, always
Watch mode saves time (Terminal 1)
Server needs manual restart (Terminal 3)
Browser hot-reloads (Terminal 2)
Run tests from root
Build before E2E
When in doubt: fresh build

starwards-monorepo

Starwards Monorepo Workflow

Overview

Monorepo Structure