---

name: dependency-upgrade description: Manage major dependency version upgrades with compatibility analysis, staged rollout, and comprehensive testing. Use when upgrading framework versions, updating major dependencies, or managing breaking changes in libraries.

Dependency Upgrade

Master major dependency version upgrades, compatibility analysis, staged upgrade strategies, and comprehensive testing approaches.

When to Use This Skill

• Upgrading major framework versions
• Updating security-vulnerable dependencies
• Modernizing legacy dependencies
• Resolving dependency conflicts
• Planning incremental upgrade paths
• Testing compatibility matrices
• Automating dependency updates

Semantic Versioning Review

MAJOR.MINOR.PATCH (e.g., 2.3.1)

MAJOR: Breaking changes
MINOR: New features, backward compatible
PATCH: Bug fixes, backward compatible

^2.3.1 = >=2.3.1 <3.0.0 (minor updates)
~2.3.1 = >=2.3.1 <2.4.0 (patch updates)
2.3.1 = exact version

Dependency Analysis

Audit Dependencies

# npm
npm outdated
npm audit
npm audit fix

# yarn
yarn outdated
yarn audit

# Check for major updates
npx npm-check-updates
npx npm-check-updates -u  # Update package.json

Analyze Dependency Tree

# See why a package is installed
npm ls package-name
yarn why package-name

# Find duplicate packages
npm dedupe
yarn dedupe

# Visualize dependencies
npx madge --image graph.png src/

Compatibility Matrix

// compatibility-matrix.js
const compatibilityMatrix = {
  'react': {
    '16.x': {
      'react-dom': '^16.0.0',
      'react-router-dom': '^5.0.0',
      '@testing-library/react': '^11.0.0'
    },
    '17.x': {
      'react-dom': '^17.0.0',
      'react-router-dom': '^5.0.0 || ^6.0.0',
      '@testing-library/react': '^12.0.0'
    },
    '18.x': {
      'react-dom': '^18.0.0',
      'react-router-dom': '^6.0.0',
      '@testing-library/react': '^13.0.0'
    }
  }
};

function checkCompatibility(packages) {
  // Validate package versions against matrix
}

Staged Upgrade Strategy

Phase 1: Planning

# 1. Identify current versions
npm list --depth=0

# 2. Check for breaking changes
# Read CHANGELOG.md and MIGRATION.md

# 3. Create upgrade plan
echo "Upgrade order:
1. TypeScript
2. React
3. React Router
4. Testing libraries
5. Build tools" > UPGRADE_PLAN.md

Phase 2: Incremental Updates

# Don't upgrade everything at once!

# Step 1: Update TypeScript
npm install typescript@latest

# Test
npm run test
npm run build

# Step 2: Update React (one major version at a time)
npm install react@17 react-dom@17

# Test again
npm run test

# Step 3: Continue with other packages
npm install react-router-dom@6

# And so on...

Phase 3: Validation

// tests/compatibility.test.js
describe('Dependency Compatibility', () => {
  it('should have compatible React versions', () => {
    const reactVersion = require('react/package.json').version;
    const reactDomVersion = require('react-dom/package.json').version;

    expect(reactVersion).toBe(reactDomVersion);
  });

  it('should not have peer dependency warnings', () => {
    // Run npm ls and check for warnings
  });
});

Breaking Change Handling

Identifying Breaking Changes

# Use changelog parsers
npx changelog-parser react 16.0.0 17.0.0

# Or manually check
curl https://raw.githubusercontent.com/facebook/react/main/CHANGELOG.md

Codemod for Automated Fixes

# React upgrade codemods
npx react-codeshift <transform> <path>

# Example: Update lifecycle methods
npx react-codeshift \
  --parser tsx \
  --transform react-codeshift/transforms/rename-unsafe-lifecycles.js \
  src/

Custom Migration Script

// migration-script.js
const fs = require('fs');
const glob = require('glob');

glob('src/**/*.tsx', (err, files) => {
  files.forEach(file => {
    let content = fs.readFileSync(file, 'utf8');

    // Replace old API with new API
    content = content.replace(
      /componentWillMount/g,
      'UNSAFE_componentWillMount'
    );

    // Update imports
    content = content.replace(
      /import { Component } from 'react'/g,
      "import React, { Component } from 'react'"
    );

    fs.writeFileSync(file, content);
  });
});

Testing Strategy

Unit Tests

// Ensure tests pass before and after upgrade
npm run test

// Update test utilities if needed
npm install @testing-library/react@latest

Integration Tests

// tests/integration/app.test.js
describe('App Integration', () => {
  it('should render without crashing', () => {
    render(<App />);
  });

  it('should handle navigation', () => {
    const { getByText } = render(<App />);
    fireEvent.click(getByText('Navigate'));
    expect(screen.getByText('New Page')).toBeInTheDocument();
  });
});

Visual Regression Tests

// visual-regression.test.js
describe('Visual Regression', () => {
  it('should match snapshot', () => {
    const { container } = render(<App />);
    expect(container.firstChild).toMatchSnapshot();
  });
});

E2E Tests

// cypress/e2e/app.cy.js
describe('E2E Tests', () => {
  it('should complete user flow', () => {
    cy.visit('/');
    cy.get('[data-testid="login"]').click();
    cy.get('input[name="email"]').type('user@example.com');
    cy.get('button[type="submit"]').click();
    cy.url().should('include', '/dashboard');
  });
});

Automated Dependency Updates

Renovate Configuration

// renovate.json
{
  "extends": ["config:base"],
  "packageRules": [
    {
      "matchUpdateTypes": ["minor", "patch"],
      "automerge": true
    },
    {
      "matchUpdateTypes": ["major"],
      "automerge": false,
      "labels": ["major-update"]
    }
  ],
  "schedule": ["before 3am on Monday"],
  "timezone": "America/New_York"
}

Dependabot Configuration

# .github/dependabot.yml
version: 2
updates:
  - package-ecosystem: "npm"
    directory: "/"
    schedule:
      interval: "weekly"
    open-pull-requests-limit: 5
    reviewers:
      - "team-leads"
    commit-message:
      prefix: "chore"
      include: "scope"

Rollback Plan

// rollback.sh
#!/bin/bash

# Save current state
git stash
git checkout -b upgrade-branch

# Attempt upgrade
npm install package@latest

# Run tests
if npm run test; then
  echo "Upgrade successful"
  git add package.json package-lock.json
  git commit -m "chore: upgrade package"
else
  echo "Upgrade failed, rolling back"
  git checkout main
  git branch -D upgrade-branch
  npm install  # Restore from package-lock.json
fi

Common Upgrade Patterns

Lock File Management

# npm
npm install --package-lock-only  # Update lock file only
npm ci  # Clean install from lock file

# yarn
yarn install --frozen-lockfile  # CI mode
yarn upgrade-interactive  # Interactive upgrades

Peer Dependency Resolution

# npm 7+: strict peer dependencies
npm install --legacy-peer-deps  # Ignore peer deps

# npm 8+: override peer dependencies
npm install --force

Workspace Upgrades

# Update all workspace packages
npm install --workspaces

# Update specific workspace
npm install package@latest --workspace=packages/app

Resources

• references/semver.md: Semantic versioning guide
• references/compatibility-matrix.md: Common compatibility issues
• references/staged-upgrades.md: Incremental upgrade strategies
• references/testing-strategy.md: Comprehensive testing approaches
• assets/upgrade-checklist.md: Step-by-step checklist
• assets/compatibility-matrix.csv: Version compatibility table
• scripts/audit-dependencies.sh: Dependency audit script

Best Practices

1. Read Changelogs: Understand what changed
2. Upgrade Incrementally: One major version at a time
3. Test Thoroughly: Unit, integration, E2E tests
4. Check Peer Dependencies: Resolve conflicts early
5. Use Lock Files: Ensure reproducible installs
6. Automate Updates: Use Renovate or Dependabot
7. Monitor: Watch for runtime errors post-upgrade
8. Document: Keep upgrade notes

Upgrade Checklist

Pre-Upgrade:
- [ ] Review current dependency versions
- [ ] Read changelogs for breaking changes
- [ ] Create feature branch
- [ ] Backup current state (git tag)
- [ ] Run full test suite (baseline)

During Upgrade:
- [ ] Upgrade one dependency at a time
- [ ] Update peer dependencies
- [ ] Fix TypeScript errors
- [ ] Update tests if needed
- [ ] Run test suite after each upgrade
- [ ] Check bundle size impact

Post-Upgrade:
- [ ] Full regression testing
- [ ] Performance testing
- [ ] Update documentation
- [ ] Deploy to staging
- [ ] Monitor for errors
- [ ] Deploy to production

Common Pitfalls

• Upgrading all dependencies at once
• Not testing after each upgrade
• Ignoring peer dependency warnings
• Forgetting to update lock file
• Not reading breaking change notes
• Skipping major versions
• Not having rollback plan