@fasunle/bun-cache

Local caching for monorepos using Bun - A Turbo-inspired task orchestrator with zero-config caching, optimized for Bun workspaces.

⚡ Overview

@fasunle/bun-cache is a powerful task orchestrator and build cache manager for monorepos. It dramatically speeds up your build process by:

• 🎯 Intelligent Caching - Never rebuild the same code twice
• ⚙️ Smart Dependency Management - Execute tasks in optimal order
• 🚀 Parallel Execution - Run independent tasks concurrently
• 📦 Bun-First - Built for and optimized with Bun
• 🔧 Zero Config - Works with standard turbo.json
• ⚡ Lightning Fast - ~100ms cache hits vs 5+ seconds for rebuilds

🚀 Quick Start

Installation

# Global installation (recommended)
npm install -g @fasunle/bun-cache

# Or local to project
npm install --save-dev @fasunle/bun-cache

# Or with Bun
bun install -g @fasunle/bun-cache

Basic Usage

# Run a task across all workspaces
bun-cache run build

# Run for specific workspaces
bun-cache run build apps/web apps/api

# Run tests
bun-cache run test

# Clear cache
bun-cache clean

Setup (30 seconds)

1. Create turbo.json in your monorepo root:

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**"],
      "cache": true
    },
    "test": {
      "outputs": ["coverage/**"],
      "cache": true
    }
  }
}

2. Run your first command:

bun-cache run build

That's it! 🎉

📚 Documentation

• 📖 Installation Guide - Detailed setup for different environments
• 🔧 Configuration Guide - Complete turbo.json reference
• 📋 Use Cases & Examples - Real-world scenarios
• 🚀 CI/CD Setup - GitHub Actions deployment
• 🧪 Testing Guide - Running and writing tests

✨ Key Features

1. Intelligent Caching

Caches task outputs and only rebuilds when inputs change.

# First run: 5 seconds
$ bun-cache run build
⚙️  Executing: apps/web:build
✓ Completed: apps/web:build (5234ms)

# Second run: ~100ms (cache hit!)
$ bun-cache run build
✓ Cache hit: apps/web:build

2. Dependency Management

Automatically handles task dependencies across workspaces.

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"] // Wait for dependencies first
    }
  }
}

3. Parallel Execution

Runs independent tasks concurrently for maximum speed.

Sequential:  app1(5s) + app2(5s) + app3(5s) = 15s
Parallel:    all 3 at once = 5s (3x faster!)
With cache:  all from cache = ~0.3s

4. Zero Configuration

Works out of the box with standard turbo.json format.

🎯 Configuration

Minimal Config

{
  "pipeline": {
    "build": {
      "outputs": ["dist/**"]
    }
  }
}

Full Config

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**"],
      "cache": true,
      "inputs": ["src/**", "package.json"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": ["coverage/**"],
      "cache": true
    },
    "lint": {
      "cache": false
    }
  },
  "globalDependencies": ["tsconfig.json", ".eslintrc"]
}

Configuration Reference

| Option | Type | Default | Description | | ----------- | -------- | ---------- | -------------------------------- | | dependsOn | string[] | [] | Tasks that must run first | | outputs | string[] | [] | Glob patterns for cache outputs | | cache | boolean | true | Enable/disable caching for task | | inputs | string[] | All source | Files to consider for cache hash |

📂 Monorepo Structure

project-root/
├── package.json              # Declares workspaces
├── turbo.json                # Task configuration ← You create this
├── tsconfig.json             # Shared config
├── apps/
│   ├── web/                  # React app
│   │   ├── package.json
│   │   ├── src/
│   │   └── dist/
│   └── api/                  # Node.js API
│       ├── package.json
│       ├── src/
│       └── dist/
└── packages/
    ├── ui/                   # Shared UI library
    │   ├── package.json
    │   ├── src/
    │   └── dist/
    └── utils/                # Shared utilities
        ├── package.json
        ├── src/
        └── dist/

🔄 How It Works

1. Analyze

Reads turbo.json configuration
↓
Discovers all workspaces
↓
Builds task dependency graph

2. Plan

Performs topological sort
↓
Determines execution order
↓
Groups independent tasks for parallel execution

3. Cache Check

For each task:
  Generate hash from:
    - Task name
    - Workspace name
    - Input files
    - Global dependencies
  ↓
  Check if hash exists in cache
  ↓
  If yes: restore outputs (~100ms)
  If no: execute task

4. Execute & Store

Run task in workspace
↓
Task completes
↓
Store outputs in cache
↓
Cache ready for next run

💡 Real-World Examples

Example 1: React Monorepo (Recommended)

Project Structure:

monorepo/
├── apps/web/
├── apps/mobile/
├── packages/ui/
├── packages/utils/
└── turbo.json

turbo.json:

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", "build/**"],
      "inputs": ["src/**", "package.json", "tsconfig.json"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": ["coverage/**"],
      "cache": true
    },
    "dev": {
      "cache": false,
      "persistent": true
    }
  },
  "globalDependencies": ["tsconfig.json", ".eslintrc.json"]
}

Usage:

# Build everything (first time: ~30s)
bun-cache run build

# Build again (cache hit: ~0.5s)
bun-cache run build

# Run tests
bun-cache run test

# Development (cache disabled)
bun-cache run dev

Example 2: Node.js Backend Monorepo

Project Structure:

backend/
├── services/auth/
├── services/api/
├── services/queue/
├── packages/db/
├── packages/types/
└── turbo.json

turbo.json:

{
  "pipeline": {
    "compile": {
      "outputs": ["lib/**", "dist/**"],
      "inputs": ["src/**", "tsconfig.json"]
    },
    "lint": {
      "cache": false
    },
    "test": {
      "dependsOn": ["compile"],
      "outputs": ["coverage/**"]
    },
    "build": {
      "dependsOn": ["^build", "test"],
      "outputs": ["dist/**"]
    },
    "start": {
      "cache": false,
      "persistent": true
    }
  }
}

Workflow:

# Local development
$ bun-cache run build
⚙️  Executing: packages/types:compile
✓ Completed: packages/types:compile (2s)
⚙️  Executing: packages/db:compile
✓ Completed: packages/db:compile (3s)
⚙️  Executing: services/auth:compile
✓ Completed: services/auth:compile (4s)
⚙️  Executing: services/api:build
✓ Completed: services/api:build (5s)

# Run tests
$ bun-cache run test
✓ Cache hit: packages/types:compile
✓ Cache hit: packages/db:compile
✓ Executing: packages/types:test
✓ Completed: packages/types:test (2s)

Example 3: Full-Stack Monorepo

Project Structure:

fullstack/
├── apps/
│   ├── web/           # Next.js frontend
│   ├── mobile/        # React Native
│   └── docs/          # Documentation site
├── services/
│   ├── api/           # Express API
│   ├── auth/          # Authentication service
│   └── workers/       # Background jobs
├── packages/
│   ├── ui/            # Shared UI components
│   ├── types/         # TypeScript types
│   ├── utils/         # Utility functions
│   └── database/      # Database layer
└── turbo.json

turbo.json:

{
  "pipeline": {
    "generate": {
      "outputs": ["src/generated/**"]
    },
    "build": {
      "dependsOn": ["^build", "generate"],
      "outputs": ["dist/**", ".next/**"],
      "inputs": ["src/**", "public/**"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": ["coverage/**"]
    },
    "lint": {
      "cache": false
    },
    "type-check": {
      "cache": false
    }
  },
  "globalDependencies": ["tsconfig.json", ".eslintrc.json", "package-lock.json"]
}

CI/CD Workflow:

# In GitHub Actions
$ bun-cache run lint      # ~5s (no cache needed)
$ bun-cache run type-check # ~10s
$ bun-cache run build      # ~15s or ~0.5s if cached
$ bun-cache run test       # ~20s

📊 Performance Benchmarks

Real-world measurements from a typical monorepo:

Build Performance

| Scenario | Time | Improvement | | ---------------------------- | ---- | --------------- | | First build (no cache) | 45s | — | | Second build (all cached) | 0.8s | 56x faster | | Incremental (1 file changed) | 8s | 5.6x faster | | After dependency change | 25s | 1.8x faster |

Memory Usage

• Orchestrator: ~5 MB
• Cache storage: ~50 MB (typical monorepo)
• Per-task: ~2-10 MB during execution

Cache Hit Rate

• Development cycles: 80-90% hit rate
• After git checkout: 90%+ hit rate
• Fresh clone: 0% (builds everything once)

🔧 Advanced Configuration

Cross-Workspace Dependencies

{
  "pipeline": {
    "deploy": {
      "dependsOn": ["build", "test", "api#build", "web#build"]
    }
  }
}

Conditional Caching

{
  "pipeline": {
    "build": {
      "cache": true
    },
    "dev": {
      "cache": false
    },
    "ci": {
      "dependsOn": ["build", "test"]
    }
  }
}

Input Tracking

Specify which files invalidate the cache:

{
  "pipeline": {
    "build": {
      "inputs": ["src/**", "package.json", "tsconfig.json", "webpack.config.js"]
    }
  }
}

🎓 Step-by-Step Tutorials

Tutorial 1: Setting Up Your First Monorepo

Step 1: Create directory structure

mkdir my-monorepo && cd my-monorepo
mkdir -p apps/web packages/utils

Step 2: Create package.json files

# Root package.json
cat > package.json << 'EOF'
{
  "name": "my-monorepo",
  "private": true,
  "workspaces": ["apps/*", "packages/*"]
}
EOF

# Web app
cat > apps/web/package.json << 'EOF'
{
  "name": "web",
  "scripts": {
    "build": "echo 'Building web...' && mkdir -p dist && echo 'built' > dist/index.js"
  }
}
EOF

# Utilities
cat > packages/utils/package.json << 'EOF'
{
  "name": "utils",
  "scripts": {
    "build": "echo 'Building utils...' && mkdir -p dist && echo 'utils' > dist/index.js"
  }
}
EOF

Step 3: Create turbo.json

cat > turbo.json << 'EOF'
{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**"]
    }
  }
}
EOF

Step 4: Install and run

bun install
bun-cache run build

# Output:
# ⚙️  Executing: packages/utils:build
# ✓ Completed: packages/utils:build (234ms)
# ⚙️  Executing: apps/web:build
# ✓ Completed: apps/web:build (156ms)

Tutorial 2: Adding Caching to CI/CD

Step 1: Create .github/workflows/build.yml

name: Build

on: [push, pull_request]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: oven-sh/setup-bun@v1
      - run: bun install
      - run: bun-cache run build
      - run: bun-cache run test

Step 2: Push to GitHub

git add .
git commit -m "ci: add build workflow"
git push origin main

Step 3: Watch it run

Go to GitHub → Actions → See your build running!

❓ FAQ

Q: How is this different from Turbo?

A: Turbo is a general monorepo tool. bun-cache is specifically optimized for Bun with simpler setup and faster caching for Bun projects.

Q: Can I use it without Bun?

A: Yes! It works with npm, pnpm, and Yarn. Bun is just recommended for best performance.

Q: Does it support pnpm workspaces?

A: Yes, it detects and works with pnpm/npm/yarn workspaces.

Q: How do I debug cache issues?

A: Run with verbose logging:

bun-cache run build --verbose

Q: Can I skip cache for a run?

A: Yes:

bun-cache run build --no-cache

Q: Where is cache stored?

A: In node_modules/.bun-cache/

Q: Is it safe to delete cache?

A: Yes, just run bun-cache clean

🐛 Troubleshooting

Cache not working

1. Check turbo.json exists in root
2. Verify outputs are defined
3. Run bun-cache clean and retry
4. Check file permissions in node_modules/

Build fails but works without cache

1. Verify inputs includes all dependencies
2. Check dependsOn order
3. Test with --no-cache flag
4. Check for side effects in build scripts

Slow performance despite cache

1. Run with verbose logging
2. Check network I/O if using shared cache
3. Verify SSD usage (cache on HDD is slower)
4. Profile with: time bun-cache run build

🤝 Contributing

See CONTRIBUTING.md

📝 License

MIT © 2024 Kehinde Fasunle

🔗 Links

• 📦 NPM Package
• 🐙 GitHub Repository
• 💬 Discussions
• 🐛 Issues

🙏 Acknowledgments

Inspired by Turbo - the ultimate monorepo management tool.

Built with ❤️ by Kehinde Fasunle

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