Dependency Management Skill

Status

🟢 High (100% completion, 3/3 comprehensive guides)

Overview

依存関係管理は、現代のソフトウェア開発において最も重要な要素の一つです。適切な依存関係管理により、セキュリティリスクの最小化、予測可能なビルド、効率的なメンテナンスが実現します。

Statistics:

• 平均的なNode.jsプロジェクト: 1,200+ の依存関係
• セキュリティ脆弱性の70%: サードパーティ依存関係から発生
• 適切な依存関係管理により、年間$500K-$5Mのコスト削減が可能

What This Skill Covers

1. Comprehensive Dependency Management

• Package manager comparison and selection (npm, yarn, pnpm, Poetry, SPM, CocoaPods)
• Lock file strategies and best practices
• Semantic Versioning deep dive
• Dependency resolution algorithms
• Monorepo dependency management
• Private package registries
• Dependency auditing workflows
• License compliance

2. Security & Vulnerability Management

• Understanding security vulnerabilities (CVE, CVSS)
• Vulnerability scanning tools (npm audit, Snyk, Dependabot, OWASP)
• Automated security updates
• Dependency pinning strategies
• Supply chain attack prevention
• SBOM (Software Bill of Materials)
• Security policies and workflows
• Incident response procedures
• Real-world security case studies

3. Dependency Optimization & Maintenance

• Bundle size optimization techniques
• Tree shaking and dead code elimination
• Dependency update strategies
• Breaking change management
• Automated dependency updates (Renovate, Dependabot)
• Deprecation handling
• Technical debt management
• Migration guides for major updates
• Performance monitoring

Quick Start

Daily Tasks (Automated)

# Security monitoring
npm audit
snyk test

# Review automated PRs
# - Dependabot security alerts
# - Renovate update PRs

Weekly Tasks

# Update patch versions
npm update

# Review outdated packages
npm outdated

# Clean unused dependencies
npx depcheck

Monthly Tasks

# Update minor versions
npm update --save

# Generate reports
npm audit --json > reports/audit.json
npx @cyclonedx/cyclonedx-npm --output-file sbom.json

# License compliance
npx license-checker --failOn "GPL;AGPL"

Quarterly Tasks

# Major version updates (planned)
npm outdated
# Review migration guides
# Plan updates

# Technical debt assessment
# Dependency health report

Comprehensive Guides

Guide 1: Comprehensive Dependency Management

38,206 characters - Complete guide covering:

• Package manager deep dive (npm, yarn, pnpm, SPM, CocoaPods, Poetry, Go)
• Lock file strategies
• Semantic Versioning mastery
• Dependency resolution algorithms
• Monorepo dependency management
• Private package registries
• Dependency auditing
• License compliance
• Real-world case studies (left-pad, event-stream, etc.)

Guide 2: Security & Vulnerability Management

47,074 characters - Security-focused guide covering:

• Understanding security vulnerabilities (RCE, XSS, Prototype Pollution, etc.)
• CVE scoring system (CVSS)
• Vulnerability scanning tools (npm audit, Snyk, GitHub Dependabot, OWASP)
• Automated security updates
• Dependency pinning strategies
• Supply chain attack prevention
• SBOM generation and management
• Security policies and workflows
• Incident response playbooks
• Real-world security case studies (Log4Shell, event-stream, colors/faker, ua-parser-js)

Guide 3: Dependency Optimization & Maintenance

39,758 characters - Optimization guide covering:

• Bundle size optimization (webpack-bundle-analyzer, code splitting)
• Tree shaking and dead code elimination
• Dependency update strategies
• Breaking change management
• Automated dependency updates (Renovate advanced configuration)
• Deprecation handling and migration
• Technical debt management
• Migration guides (React 17→18, Next.js 13→14, Webpack 4→5)
• Performance monitoring

Templates & Configurations

Automation Templates

• Dependabot Configuration - Complete .github/dependabot.yml template with all ecosystems
• Renovate Configuration - Advanced Renovate Bot configuration
• Auto-Merge Workflow - GitHub Actions for automatic PR merging
• npm Configuration - Production-ready .npmrc with security settings

Checklists

• Dependency Audit Checklist - Before adding dependencies, weekly/monthly/quarterly reviews
• Security Checklist - Daily/weekly/monthly security tasks, incident response

Best Practices Summary

Package Manager Selection

JavaScript/TypeScript:

• 🥇 pnpm - Best performance, strict dependency resolution, disk efficiency
• 🥈 npm - Default, stable, widely supported
• 🥉 yarn - Good for monorepos, Plug'n'Play mode

iOS/Swift:

• 🥇 Swift Package Manager - Official, modern, Xcode integrated
• 🥈 CocoaPods - Mature, legacy support

Python:

• 🥇 Poetry - Modern, excellent dependency resolution
• 🥈 pip - Simple, traditional approach

Version Pinning Strategy

{
  "dependencies": {
    // Critical packages: exact versions
    "react": "18.2.0",

    // Important packages: patch updates only
    "lodash": "~4.17.21",

    // Low-risk packages: minor updates allowed
    "axios": "^1.6.0"
  },
  "devDependencies": {
    // Dev tools: flexible updates
    "typescript": "^5.3.0"
  }
}

Security Best Practices

1. Enable Automated Scanning

   • GitHub Dependabot
   • Snyk
   • npm audit in CI/CD

2. Response Times

   • Critical vulnerabilities: < 24 hours
   • High vulnerabilities: < 48 hours
   • Medium vulnerabilities: < 1 week

3. Supply Chain Protection

   • Use lock files (always commit)
   • Private registry proxy
   • Package verification
   • SBOM generation

Update Strategy

Update Type	Frequency	Automation	Review
Security patches	Immediate	✅ Auto-merge	Minimal
Patch (x.x.PATCH)	Weekly	✅ Auto-merge	CI only
Minor (x.MINOR.x)	Monthly	⚠️ Manual merge	Code review
Major (MAJOR.x.x)	Quarterly	❌ Manual	Full review

Essential Tools

Security

• npm audit (built-in)
• Snyk (comprehensive)
• GitHub Dependabot (native)
• Socket.dev (supply chain)
• OWASP Dependency-Check

Automation

• Renovate (advanced features)
• Dependabot (GitHub native)

Analysis

• webpack-bundle-analyzer
• bundlephobia.com
• depcheck
• npm-check-updates

Compliance

• license-checker
• SBOM generators (CycloneDX, SPDX)
• Dependency-Track

Metrics & KPIs

Track these metrics for dependency health:

Security Metrics

• Vulnerability count (Critical/High/Medium/Low)
• Mean time to detect (MTTD)
• Mean time to remediate (MTTR)
• Security scan success rate

Target: 0 critical/high vulnerabilities, MTTR < 7 days

Dependency Metrics

• Total dependency count
• Outdated percentage
• Average dependency age
• Deprecated package count

Target: < 5% outdated, < 200 total dependencies

Performance Metrics

• Bundle size (gzipped)
• Build time
• Install time

Target: < 200KB initial bundle, < 2min builds

Process Metrics

• Automated update success rate
• Manual review time
• Breaking change incidents

Target: > 80% auto-merge, < 1 incident/month

Common Patterns

Pattern 1: Security-First Approach

# Immediate security updates
- Daily vulnerability scans
- Auto-merge security patches
- 24-hour response for critical CVEs
- Monthly security audit reports

Pattern 2: Stability-First Approach

# Controlled updates
- Lock all production dependencies
- Manual review for all updates
- Staging deployment before production
- Quarterly update cycles

Pattern 3: Innovation-First Approach

# Stay current
- Daily dependency updates
- Auto-merge minor updates
- Beta testing of new versions
- Monthly major version evaluations

Troubleshooting

Problem: Build Failures After Update

Symptoms: Tests fail, TypeScript errors, runtime errors

Solutions:

1. Check breaking changes in changelog
2. Review migration guide
3. Use codemod tools for automated migration
4. Rollback and plan migration
5. Pin problematic dependency temporarily

Problem: Security Vulnerabilities in Transitive Dependencies

Symptoms: npm audit shows vulnerabilities you don't directly use

Solutions:

1. Update parent dependency
2. Use npm audit fix --force (carefully)
3. Use overrides (npm 8.3+) or resolutions (yarn)
4. Contact package maintainer
5. Find alternative package

Problem: Dependency Conflicts

Symptoms: "Cannot resolve dependency", version conflicts

Solutions:

1. Use npm ls <package> to see dependency tree
2. Use overrides/resolutions to force version
3. Update conflicting packages
4. Consider alternative packages

Related Skills

• ios-project-setup - Project initialization
• ci-cd-automation - CI/CD pipelines
• ios-security - Security practices
• web-development - Web development
• react-development - React patterns
• nextjs-development - Next.js patterns

Quick Reference Commands

npm

npm install              # Install dependencies
npm ci                   # Clean install (CI/CD)
npm update              # Update patch versions
npm outdated            # Show outdated packages
npm audit               # Security audit
npm audit fix           # Auto-fix vulnerabilities
npx depcheck           # Find unused dependencies
npx npm-check-updates   # Check all updates

Yarn

yarn install                      # Install
yarn upgrade                      # Update
yarn audit                        # Security audit
yarn outdated                     # Check outdated
yarn install --frozen-lockfile    # CI/CD

pnpm

pnpm install                      # Install
pnpm update                       # Update
pnpm audit                        # Security audit
pnpm outdated                     # Check outdated
pnpm install --frozen-lockfile    # CI/CD

Security Tools

snyk test                         # Snyk security scan
npx socket-cli audit              # Socket.dev scan
npx @cyclonedx/cyclonedx-npm      # Generate SBOM
npx license-checker               # License check

Version History

• 2025-01-03: Complete overhaul to 🟢 High status

  • Added 3 comprehensive guides (125,000+ total characters)
  • Created automation templates (Dependabot, Renovate, CI/CD)
  • Added comprehensive checklists
  • Expanded to cover all major package managers
  • Added real-world case studies
  • Included security best practices
  • Added performance optimization techniques

• 2024-12-24: Initial version (📝 Basic status)

  • Basic package manager coverage
  • Simple version management guidelines

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Maintained by: Development Team Last Updated: 2025-01-03 Status: 🟢 High (100% complete)