📦 dep-optimizer

Smart dependency analyzer and optimizer for Node.js projects - Slash your bundle size, eliminate duplicates, and optimize your dependency tree with zero configuration.

🚀 Why dep-optimizer?

Are duplicate dependencies bloating your node_modules folder? Is your bundle size out of control? dep-optimizer is your go-to CLI tool for keeping your Node.js projects lean, fast, and optimized.

The Problem

• Bloated bundles: Duplicate packages waste disk space and slow down installations
• Conflicting versions: Different dependencies pulling in incompatible versions of the same package
• Hidden costs: You don't know which duplicates are costing you the most space
• Manual detective work: Finding and fixing duplicates is tedious and error-prone

The Solution

dep-optimizer automatically scans your entire dependency tree, identifies duplicates, calculates wasted space, and provides actionable recommendations to consolidate your dependencies.

✨ Features

• 🔍 Deep Scanning: Recursively analyzes your entire node_modules tree
• 🎯 Duplicate Detection: Identifies all duplicate packages across different versions
• 💾 Space Analysis: Calculates exact wasted space from duplicate dependencies
• 🤖 Smart Consolidation: Detects which duplicates can be safely consolidated using semver
• 📊 Beautiful Reports: Color-coded, easy-to-read CLI output
• ⚡ Lightning Fast: Optimized scanning with minimal overhead
• 🛠️ Zero Config: Works out of the box with any Node.js project
• 📈 JSON Export: Machine-readable output for CI/CD integration
• 🎨 Rich CLI: Multiple commands for different use cases

📥 Installation

Global Installation (Recommended)

npm install -g dep-optimizer

Local Installation

npm install --save-dev dep-optimizer

Run Without Installing

npx dep-optimizer analyze

🎯 Quick Start

Navigate to your Node.js project and run:

# Full analysis (scan + duplicates)
dep-optimizer analyze

# Just scan dependencies
dep-optimizer scan

# Find duplicate dependencies
dep-optimizer duplicates

# Check a specific package
dep-optimizer check lodash

📖 Usage

Full Analysis

Get a complete overview of your dependencies and duplicates:

dep-optimizer analyze

Output:

📦 Dependency Scan Results

Total packages: 842
Total size: 156.43 MB
Scanned paths: 842

🔍 Duplicate Package Analysis

Found 12 duplicate packages
Total wasted space: 8.54 MB
3 packages can be consolidated

lodash
──────────────────────────────────────────────────
Versions found: 3
Total instances: 5
Wasted space: 3.21 MB
✓ Can consolidate to version 4.17.21

Scan Dependencies

View all installed dependencies and their sizes:

dep-optimizer scan

Find Duplicates

Analyze only duplicate dependencies:

dep-optimizer duplicates

Advanced options:

# Show file paths for each duplicate
dep-optimizer duplicates --show-paths

# Only show duplicates wasting more than 1MB
dep-optimizer duplicates --min-waste 1048576

# Verbose output
dep-optimizer duplicates --verbose

# JSON output for automation
dep-optimizer duplicates --json

Check Specific Package

Inspect a single package for duplicates:

dep-optimizer check react

Output:

Found 2 versions of react:
  - 17.0.2 (1 instances)
  - 18.2.0 (1 instances)

✓ Can consolidate to version 18.2.0

🎨 Command Reference

| Command | Description | Options | |---------|-------------|---------| | analyze | Complete analysis: scan + duplicates | -p, --path, -v, --verbose, --json, --show-paths | | scan | Scan all dependencies | -p, --path, -v, --verbose, --json | | duplicates | Find duplicate dependencies | -p, --path, -v, --verbose, --json, --show-paths, --min-waste | | check <package> | Check specific package for duplicates | -p, --path, -v, --verbose, --json, --show-paths |

Global Options

• -p, --path <path>: Specify project path (default: current directory)
• -v, --verbose: Enable verbose output
• --json: Output results in JSON format
• --show-paths: Display file paths for each version
• --min-waste <bytes>: Minimum wasted space threshold

💡 Practical Examples

Find the Biggest Space Wasters

dep-optimizer duplicates --min-waste 1000000

This shows only duplicates wasting over 1MB of space.

Analyze a Different Project

dep-optimizer analyze --path /path/to/project

CI/CD Integration

# Export to JSON and parse in your CI pipeline
dep-optimizer duplicates --json > duplicates-report.json

# Fail CI if duplicates waste more than 10MB
dep-optimizer duplicates --json | jq '.totalWastedSpace > 10485760' | grep -q true && exit 1

Debug Specific Package

dep-optimizer check axios --show-paths --verbose

🔧 How It Works

1. Scanning: Recursively walks through node_modules and reads all package.json files
2. Analysis: Groups packages by name and identifies multiple versions
3. Size Calculation: Computes actual disk space used by each package
4. Semver Check: Uses semantic versioning to determine if versions can be consolidated
5. Reporting: Generates beautiful, actionable reports

🎯 After Finding Duplicates

Step 1: Update package.json

Review the consolidation recommendations and update your package.json to use compatible version ranges:

{
  "dependencies": {
    "lodash": "^4.17.21"  // Use latest compatible version
  }
}

Step 2: Deduplicate

Run npm's built-in deduplication:

npm dedupe

Step 3: Verify

Check that duplicates are gone:

dep-optimizer duplicates

🧪 Testing

# Run tests
npm test

# Run tests with coverage
npm run test:coverage

# Watch mode
npm run test:watch

🛠️ Development

# Clone the repository
git clone https://github.com/yourusername/dep-optimizer.git

# Install dependencies
npm install

# Build the project
npm run build

# Run in development mode
npm run dev

# Run linter
npm run lint

📊 Example Output

🔍 Duplicate Package Analysis

Found 8 duplicate packages
Total wasted space: 12.34 MB
5 packages can be consolidated

lodash
──────────────────────────────────────────────────
Versions found: 3
Total instances: 7
Wasted space: 4.12 MB
✓ Can consolidate to version 4.17.21

Versions:
  4.17.19 (2 instances, 1.37 MB)
  4.17.20 (3 instances, 1.38 MB)
  4.17.21 (2 instances, 1.37 MB)

📊 Summary

Total duplicate packages: 8
Potential space savings: 12.34 MB
Auto-consolidatable packages: 5

💡 Recommendation:
Update your package.json to use compatible version ranges for the consolidatable packages.
Run "npm dedupe" after updating to remove duplicates.

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Built with TypeScript for type safety
• Powered by Commander.js for CLI
• Colored output with Chalk
• Semver analysis with node-semver

🐛 Issues

Found a bug? Have a feature request? Open an issue!

📝 Changelog

See CHANGELOG.md for a list of changes.

Made with ❤️ for the Node.js community

If dep-optimizer saved you disk space and made your life easier, please give it a ⭐ on GitHub!