Development Workflow

🔄 Turborepo Configuration

The monorepo uses Turborepo for efficient task orchestration and caching across packages and applications.

🏗 Turborepo Task Pipeline

Core Configuration

// turbo.json
{
  "$schema": "https://turborepo.com/schema.json",
  "ui": "tui",
  "tasks": {
    "build": {
      "dependsOn": ["^build"],
      "inputs": ["$TURBO_DEFAULT$", ".env*"],
      "outputs": ["dist/**"]
    },
    "lint": {
      "dependsOn": ["^lint"]
    },
    "check-types": {
      "dependsOn": ["^build"]
    },
    "start": {
      "cache": false,
      "persistent": true
    },
    "watch": {
      "cache": false,
      "persistent": true
    },
    "test": {
      "dependsOn": ["^build"],
      "inputs": ["$TURBO_DEFAULT$", ".env*"]
    }
  }
}

Task Dependencies

Build Pipeline: Shared packages build before applications
Type Checking: Depends on built packages for type resolution
Testing: Requires built dependencies
Linting: Runs independently with dependency chain

📦 Workspace Structure

Yarn Workspaces

// package.json
{
  "workspaces": ["apps/*", "packages/*"],
  "packageManager": "yarn@4.9.2"
}

Current Workspaces

lfx-one/
├── apps/
│   └── lfx-one/              # Angular application
└── packages/
    └── shared/               # Shared interfaces and constants

🛠 Development Commands

Root-Level Commands

# Build all packages and applications
yarn build

# Start development servers
yarn start

# Run linting across all workspaces
yarn lint

# Run tests across all workspaces
yarn test

# Type checking across all workspaces
yarn check-types

# Watch mode for development
yarn watch

# Format code with Prettier
yarn format

Production Commands

# Start production server with PM2
yarn start:prod

# Stop production server
yarn stop:prod

# Restart production server
yarn restart:prod

# Zero-downtime reload
yarn reload:prod

# View production logs
yarn logs:prod

🔄 Development Workflow

Typical Development Flow

Install Dependencies
```
yarn install
```
Build Shared Packages
```
cd packages/shared
yarn build
```
Start Development Server
```
yarn start
```

Make Changes and Test

# In separate terminal
./check-headers.sh  # Verify license headers
yarn lint
yarn check-types

Shared Package Development

When working on shared packages:

# Navigate to shared package
cd packages/shared

# Watch for changes and rebuild
yarn watch

# In another terminal, start the app
cd ../../
yarn start

🎯 Task Execution Strategy

Parallel Execution

Turborepo runs tasks in parallel when possible:

# These run in parallel across workspaces
yarn lint    # Lints all packages simultaneously
yarn test    # Tests all packages simultaneously

Dependency-Based Execution

# These respect dependency order
yarn build          # Builds shared packages first, then apps
yarn check-types    # Type checks after dependencies are built

📊 Caching Strategy

Build Caching

{
  "build": {
    "outputs": ["dist/**"], // Cache build outputs
    "inputs": ["$TURBO_DEFAULT$", ".env*"] // Invalidate on file changes
  }
}

Cache Benefits

Faster Builds: Skip unchanged packages
CI/CD Optimization: Share cache across environments
Development Speed: Incremental builds

Non-Cached Tasks

{
  "start": {
    "cache": false, // Development server shouldn't be cached
    "persistent": true // Long-running process
  }
}

🔧 TypeScript Configuration

Shared TypeScript Config

Projects inherit from shared configuration:

// packages/shared/tsconfig.json
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "declaration": true,
    "declarationMap": true,
    "outDir": "./dist"
  }
}

Application TypeScript Config

// apps/lfx-one/tsconfig.json
{
  "extends": "./tsconfig.app.json",
  "compilerOptions": {
    "paths": {
      "@lfx-one/shared": ["../../packages/shared/src/index.ts"],
      "@lfx-one/shared/*": ["../../packages/shared/src/*"]
    }
  }
}

📋 Dependency Management

Package Dependencies

// Root package.json
{
  "devDependencies": {
    "prettier": "^3.6.2",
    "turbo": "^2.5.4",
    "typescript": "5.8.3"
  },
  "engines": {
    "node": ">=22"
  }
}

Workspace Dependencies

// apps/lfx-one/package.json
{
  "dependencies": {
    "@lfx-one/shared": "workspace:*"
  }
}

🔄 Version Management

Workspace Versioning

Independent Versioning: Each package has its own version
Workspace Protocol: Use workspace:* for local dependencies
Semantic Versioning: Follow semver for all packages

Release Process

Update package versions
Build all packages
Run tests
Commit and tag
Deploy applications

🔐 Code Quality and Compliance

License Header Requirements

All source code files must include the appropriate license header:

# Check license headers
./check-headers.sh

Required Format:

// Copyright The Linux Foundation and each contributor to LFX.
// SPDX-License-Identifier: MIT

Pre-commit Hooks

The repository uses Husky for pre-commit hooks that automatically run:

License Header Check - Ensures all files have proper headers
Linting - Runs ESLint and Prettier
Type Checking - Verifies TypeScript types
Format Check - Ensures consistent code formatting

# Pre-commit hooks run automatically on commit
git commit -m "your changes"

# To bypass pre-commit hooks (not recommended)
git commit -m "your changes" --no-verify

CI/CD Integration

License Header Check: Automated workflow validates headers on PRs
Quality Checks: Separate workflow for linting, testing, and building
Automated Enforcement: PRs cannot be merged without passing all checks

🎯 Best Practices

Development Guidelines

License Headers: Ensure all new files have proper license headers
Shared Package First: Build shared packages before applications
Type Safety: Always run type checking before commits
Linting: Maintain consistent code style
Testing: Run tests in affected packages
Incremental Builds: Leverage Turborepo caching

Performance Optimization

# Run only affected packages (future feature)
yarn build --filter=...HEAD^

# Parallel execution
yarn build --parallel

# Remote caching (in CI/CD)
yarn build --remote-cache

🔧 Troubleshooting

Common Issues

# Clear Turborepo cache
npx turbo prune

# Reinstall dependencies
rm -rf node_modules packages/*/node_modules apps/*/node_modules
yarn install

# Force rebuild shared packages
cd packages/shared
rm -rf dist
yarn build

Build Issues

# Check dependency graph
npx turbo build --graph

# Verbose build output
npx turbo build --verbose

# Build specific package
npx turbo build --filter=@lfx-one/shared

📈 Monitoring and Analytics

Task Performance

Turborepo provides insights into task performance:

# Task timing information
yarn build --profile

# Task dependency visualization
yarn build --graph

Cache Hit Rates

Monitor cache effectiveness:

High cache hit rates indicate efficient incremental builds
Low cache hit rates suggest configuration issues

This development workflow provides efficient monorepo management with fast builds and reliable dependency handling — Turborepo task orchestration, Yarn 4 workspaces, TypeScript path mapping, parallel task execution, and local build caching.

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