monorepo-management

# Monorepo Management

Build efficient, scalable monorepos that enable code sharing, consistent tooling, and atomic changes across multiple packages and applications.

## When to Use This Skill

- Setting up new monorepo projects
- Migrating from multi-repo to monorepo
- Optimizing build and test performance
- Managing shared dependencies
- Implementing code sharing strategies
- Setting up CI/CD for monorepos
- Versioning and publishing packages
- Debugging monorepo-specific issues

## Core Concepts

### 1. Why Monorepos?

**Advantages:**

- Shared code and dependencies
- Atomic commits across projects
- Consistent tooling and standards
- Easier refactoring
- Simplified dependency management
- Better code visibility

**Challenges:**

- Build performance at scale
- CI/CD complexity
- Access control
- Large Git repository

### 2. Monorepo Tools

**Package Managers:**

- pnpm workspaces (recommended)
- npm workspaces
- Yarn workspaces

**Build Systems:**

- Turborepo (recommended for most)
- Nx (feature-rich, complex)
- Lerna (older, maintenance mode)

## Turborepo Setup

### Initial Setup

```bash
# Create new monorepo
npx create-turbo@latest my-monorepo
cd my-monorepo

# Structure:
# apps/
#   web/          - Next.js app
#   docs/         - Documentation site
# packages/
#   ui/           - Shared UI components
#   config/       - Shared configurations
#   tsconfig/     - Shared TypeScript configs
# turbo.json      - Turborepo configuration
# package.json    - Root package.json
```

### Configuration

```json
// turbo.json
{
  "$schema": "https://turbo.build/schema.json",
  "globalDependencies": ["**/.env.*local"],
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**", "!.next/cache/**"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": ["coverage/**"]
    },
    "lint": {
      "outputs": []
    },
    "dev": {
      "cache": false,
      "persistent": true
    },
    "type-check": {
      "dependsOn"