CompatGuard is an intelligent, AI-powered compatibility checking system that integrates authoritative Baseline data directly into your development workflow. It provides real-time feedback, automated migrations, and risk assessment for web platform features across popular frameworks.

• 🛡️ Real-time Baseline Compliance Checking - Instant compatibility analysis using official web-features npm package
• 🧠 AI-Powered Migration Assistant - Multi-agent AI system for intelligent code transformations
• ⚡ Framework-Aware Analysis - Deep understanding of React, Vue, Svelte, and Angular patterns
• 📊 Risk Assessment & Prediction - ML-powered risk scoring and migration forecasting

• 🔧 VS Code Extension - Real-time diagnostics with Language Server Protocol
• 🛠️ Build Tool Plugins - Webpack, Vite, and Rollup integration
• 📝 ESLint Configuration - Traditional linting pipeline compatibility
• 🚀 CI/CD Pipeline - GitHub Actions and automated compliance gating

• Installation
• Quick Start
• Configuration
• Framework Support
• AI Features
• Architecture
• API Reference
• Development
• Contributing
• License

• Node.js 18.0.0 or higher
• npm, yarn, or pnpm

npm install -g @compatguard/cli

# Install core package
npm install --save-dev @compatguard/core

# Install framework-specific plugins
npm install --save-dev @compatguard/react @compatguard/vue @compatguard/svelte

# Install build tool plugins
npm install --save-dev @compatguard/webpack-plugin

Install from VS Code Marketplace or search for "CompatGuard" in extensions.

Create compatguard.config.js in your project root:

export default {
  baseline: {
    target: 'high', // 'high' (widely available) or 'low' (newly available)
    year: 2025
  },
  frameworks: ['react', 'vue', 'svelte'],
  rules: {
    css: 'error',
    javascript: 'warning',
    html: 'error'
  },
  ai: {
    enabled: true,
    migrationSuggestions: true,
    riskAssessment: true
  }
};

# Analyze entire project
npx compatguard analyze ./src

# Generate migration report
npx compatguard report --format=html

# Fix auto-fixable issues
npx compatguard fix ./src/components

# Run with specific baseline target
npx compatguard check --target=high --framework=react

Add to your .vscode/settings.json:

{
  "compatguard.enable": true,
  "compatguard.targetYear": 2025,
  "compatguard.frameworks": ["react", "vue"],
  "compatguard.showHoverInformation": true
}

// compatguard.config.js
export default {
  // Baseline Configuration
  baseline: {
    target: 'high',
    year: 2025,
    browsers: ['chrome >= 90', 'firefox >= 88', 'safari >= 14']
  },
  
  // Framework Support
  frameworks: {
    react: {
      version: '18.2.0',
      analyzeHooks: true,
      jsx: true
    },
    vue: {
      version: '3.3.0',
      compositionApi: true,
      templateAnalysis: true
    },
    svelte: {
      version: '4.0.0',
      compileTimeChecks: true
    }
  },
  
  // AI Features
  ai: {
    enabled: true,
    openAIApiKey: process.env.OPENAI_API_KEY,
    features: {
      migrationSuggestions: true,
      riskPrediction: true,
      polyfillOptimization: true,
      codeGeneration: true
    }
  },
  
  // Rule Configuration
  rules: {
    'css-grid': 'error',
    'flexbox-gap': 'warning',
    'array-flatmap': 'error',
    'intersection-observer': 'warning'
  },
  
  // Ignore Patterns
  ignore: [
    '**/legacy/**',
    '**/*.test.js',
    '**/node_modules/**'
  ],
  
  // Reporting
  report: {
    format: ['html', 'json'],
    output: './compatguard-reports',
    detailed: true
  }
};

# Required for AI features
OPENAI_API_KEY=your_openai_api_key

# Optional configuration
COMPATGUARD_CONFIG_PATH=./config/compatguard.js
COMPATGUARD_CACHE_DIR=./.compatguard/cache

// CompatGuard understands React patterns and hooks
import React, { useEffect } from 'react';

function ProductGrid() {
  useEffect(() => {
    // Flags IntersectionObserver compatibility in React effects
    const observer = new IntersectionObserver(callback);
    return () => observer.disconnect();
  }, []);

  return (
    // Analyzes JSX and CSS-in-JS
    <div style={{ display: 'subgrid' }}> {/* Flags CSS subgrid */}
      <ProductCard />
    </div>
  );
}

<template>
  <!-- Analyzes template syntax -->
  <dialog open> <!-- Flags dialog element compatibility -->
    <div class="container">
      {{ message }}
    </div>
  </dialog>
</template>

<script setup>
// Understands Composition API
import { ref } from 'vue';

const message = ref('Hello CompatGuard');
</script>

<style>
.container {
  display: subgrid; /* Flags CSS compatibility issues */
}
</style>

<script>
  // Analyzes Svelte-specific patterns
  import { writable } from 'svelte/store';
  
  const count = writable(0);
</script>

<!-- Understands Svelte template syntax -->
<dialog open>
  <div class="grid">
    <button on:click={() => $count += 1}>
      Clicks: {$count}
    </button>
  </div>
</dialog>

<style>
  .grid {
    display: subgrid; /* CSS compatibility analysis */
  }
</style>

// Before AI migration
export function processProducts(products) {
  return products.flatMap(product => 
    product.variants.map(variant => ({
      ...variant,
      fullName: `${product.name} - ${variant.name}`
    }))
  );
}

// After AI migration (CompatGuard suggests)
export function processProducts(products) {
  return products.map(product => 
    product.variants.map(variant => ({
      ...variant,
      fullName: `${product.name} - ${variant.name}`
    }))
  ).flat();
}

// CompatGuard provides risk analysis
const riskReport = {
  feature: 'CSS Subgrid',
  currentSupport: '78%',
  riskLevel: 'medium',
  affectedUsers: '22%',
  migrationComplexity: 'low',
  suggestedTimeline: 'Next sprint',
  alternative: 'CSS Grid with explicit sizing'
};

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Development   │    │   CompatGuard    │    │   AI Engine     │
│   Environment   │◄──►│   Core Engine    │◄──►│   & Analytics   │
└─────────────────┘    └──────────────────┘    └─────────────────┘
         │                       │                       │
         ▼                       ▼                       ▼
┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   IDE Plugin    │    │   Framework      │    │   Baseline      │
│   (LSP)         │    │   Analyzers      │    │   Data Source   │
└─────────────────┘    └──────────────────┘    └─────────────────┘

interface AnalysisEngine {
  parseCode(code: string, framework: Framework): AST;
  extractFeatures(ast: AST): FeatureUsage[];
  checkCompatibility(features: FeatureUsage[]): CompatibilityReport;
  generateFixes(issues: CompatibilityIssue[]): CodeFix[];
}

class AIOrchestrator {
  private agents: Map<string, MigrationAgent>;
  
  async analyzeCodebase(project: ProjectContext): Promise<Analysis> {
    const [analysis, risks, strategy] = await Promise.all([
      this.agents.get('analyzer').analyze(project),
      this.agents.get('risk-assessor').predictRisks(project),
      this.agents.get('strategist').planMigration(project)
    ]);
    
    return { analysis, risks, strategy };
  }
}

abstract class FrameworkParser {
  abstract parse(code: string): FrameworkAST;
  abstract extractPatterns(ast: FrameworkAST): FrameworkPattern[];
  abstract generateFrameworkSpecificFixes(issue: CompatibilityIssue): CodeFix[];
}

import { CompatGuard } from '@compatguard/core';

const guard = new CompatGuard({
  baseline: { target: 'high', year: 2025 }
});

// Analyze code
const report = await guard.analyze({
  code: 'const data = items.flatMap(x => x.values);',
  filePath: 'src/utils.js',
  framework: 'react'
});

// Generate fixes
const fixes = await guard.generateFixes(report.issues);

// Get AI suggestions
const suggestions = await guard.getAISuggestions(report);

// Custom rule development
export const customRule = {
  id: 'custom-feature-check',
  meta: {
    type: 'problem',
    docs: {
      description: 'Custom compatibility rule',
      category: 'Compatibility'
    }
  },
  create(context) {
    return {
      CallExpression(node) {
        // Custom analysis logic
        if (isIncompatibleAPI(node)) {
          context.report({
            node,
            message: 'Incompatible API usage',
            fix: fixer => fixer.replaceText(node, getAlternative(node))
          });
        }
      }
    };
  }
};

# Clone repository
git clone https://github.com/yourusername/compatguard.git
cd compatguard

# Install dependencies
npm install

# Build all packages
npm run build

# Run tests
npm test

# Start development mode
npm run dev

compatguard/
├── packages/
│   ├── core/                 # Core analysis engine
│   ├── cli/                  # Command line interface
│   ├── vscode-extension/     # VS Code plugin
│   ├── webpack-plugin/       # Webpack integration
│   ├── eslint-plugin/        # ESLint rules
│   └── frameworks/           # Framework-specific analyzers
├── examples/                 # Usage examples
├── docs/                     # Documentation
└── tests/                    # Test suites

# Run all test suites
npm test

# Run specific test groups
npm run test:core
npm run test:react
npm run test:ai

# Run with coverage
npm run test:coverage

# Performance testing
npm run test:performance

We love your input! Please see our Contributing Guide for details on:

• 🐛 Reporting bugs
• 💡 Suggesting new features
• 🔧 Setting up development environment
• 📝 Submitting pull requests
• 🎨 Design and documentation contributions

# Fork and clone repository
git clone https://github.com/yourusername/compatguard.git

# Create feature branch
git checkout -b feature/amazing-feature

# Make changes and test
npm run test

# Commit changes
git commit -m 'Add amazing feature'

# Push to branch
git push origin feature/amazing-feature

# Open pull request

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

• Baseline Initiative for authoritative web standards data
• OpenAI for AI/ML capabilities powering intelligent migrations
• Contributors who help improve CompatGuard
• Early Adopters for valuable feedback and testing

• 📧 Email: support@compatguard.dev
• 🐛 Issues: GitHub Issues
• 💬 Discussions: GitHub Discussions
• 📚 Documentation: Full Documentation

CompatGuard provides comprehensive compatibility analysis across multiple platform types:

Full support for modern dashboard applications with real-time analytics and data visualization. Includes checks for:

• Chart libraries (Chart.js, Recharts, D3.js)
• Data grid components
• Real-time WebSocket connections
• Advanced CSS layouts (Grid, Flexbox, Container Queries)

Specialized analysis for online retail applications including:

• Payment API compatibility (Stripe, PayPal)
• Product catalog optimizations
• Shopping cart functionality
• Mobile-first responsive design patterns
• Progressive Web App features

Optimized for high-conversion landing pages and marketing sites:

• Animation and transition compatibility
• SEO-critical HTML5 features
• Form validation APIs
• Performance optimization checks
• Cross-browser consistency for visual elements

Native and hybrid mobile app support:

• React Native compatibility analysis
• Expo SDK feature detection
• Mobile-specific APIs (Geolocation, Camera, Sensors)
• Touch interaction patterns
• Offline functionality checks

Track compliance across your entire application portfolio from a centralized dashboard:

// Access portfolio analytics
const portfolioStats = {
  totalProjects: 4,
  averageCompliance: 81.3,
  totalIssues: 220,
  criticalIssues: 12,
  platformBreakdown: {
    dashboard: { compliance: 66.1, issues: 211 },
    ecommerce: { compliance: 87.4, issues: 3 },
    marketing: { compliance: 92.1, issues: 3 },
    mobile: { compliance: 79.5, issues: 3 }
  }
};

Easily switch between projects with the integrated project selector:

• Quick project switching in the header
• Real-time compliance updates per project
• Platform-specific issue filtering
• Historical trend tracking per project

Analyze patterns and issues across your entire portfolio:

• Common compatibility issues across platforms
• Framework-specific patterns and best practices
• Centralized risk assessment
• Consolidated migration planning

Monitor compliance scores over time with detailed analytics:

• Weekly compliance score trends
• Issue resolution velocity
• New issues vs. resolved issues tracking
• Predictive compliance forecasting

Comprehensive issue tracking and filtering:

• Severity Levels: Critical, High, Medium, Low
• Categories:
  • Newly Available Features (Baseline 2024+)
  • Widely Available Features (Baseline < 2024)
  • Best Practices
  • Performance Optimizations
• Platform-Specific Issues: Filter by project and platform type
• Framework-Specific Patterns: React, Vue, Svelte, Angular

Understand the business implications of compatibility issues:

const impactMetrics = {
  affectedFeatures: 'Product grid, checkout flow',
  estimatedRevenueLoss: '$15K/month',
  userExperience: 'Reduced by 12%',
  conversionRate: 'Down 3.2%',
  pageLoadTime: 'Increased by 340ms'
};

CompatGuard continuously monitors your codebase:

• Real-time file watching
• Instant compatibility checks on save
• Hot-reload integration with Vite/Webpack
• Background scanning for large codebases

Stay informed about critical compatibility issues:

• Toast notifications for quick updates
• Email alerts for critical issues
• Slack/Teams integration
• Custom webhook support

Fine-tune your compatibility requirements:

export default {
  baseline: {
    target: 'custom',
    customRules: {
      'css-container-queries': {
        minSupport: 85,
        severity: 'medium',
        alternative: 'CSS Media Queries'
      },
      'array-groupby': {
        minSupport: 75,
        severity: 'high',
        polyfill: '@core-js/array-groupby'
      }
    }
  }
};

Enforce team-wide compatibility standards:

organizationPolicies: {
  name: 'Enterprise Web Standards',
  minimumCompliance: 85,
  blockingIssues: ['critical', 'high'],
  autoFixEnabled: true,
  cicdGating: true,
  exemptions: {
    patterns: ['**/legacy/**', '**/vendor/**'],
    expires: '2025-12-31'
  }
}

Intelligent polyfill optimization:

polyfills: {
  strategy: 'dynamic', // 'static' | 'dynamic' | 'selective'
  sizeOptimization: true,
  bundleAnalysis: true,
  recommendations: {
    'array-flatmap': {
      library: 'core-js',
      size: '2.1kb',
      performance: 'minimal impact'
    }
  }
}

Generate comprehensive compatibility reports:

# HTML Report with interactive charts
npx compatguard report --format=html

# JSON for CI/CD integration
npx compatguard report --format=json --output=./reports/

# PDF for stakeholder presentations
npx compatguard report --format=pdf --include-charts

# CSV for data analysis
npx compatguard report --format=csv --groupby=severity

Each report includes:

• Executive summary with compliance scores
• Detailed issue breakdown by severity
• Framework-specific analysis
• Migration recommendations
• Cost and time estimates
• Visual charts and graphs
• Historical trend comparisons

name: CompatGuard Check

on: [push, pull_request]

jobs:
  compatibility:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-node@v3
        with:
          node-version: '18'

      - name: Install CompatGuard
        run: npm install -g @compatguard/cli

      - name: Run Compatibility Check
        run: |
          compatguard analyze ./src --format=json --output=report.json
          compatguard gate --min-compliance=85 --fail-on=critical,high

      - name: Upload Report
        uses: actions/upload-artifact@v3
        with:
          name: compatguard-report
          path: report.json

compatguard:
  stage: test
  image: node:18
  script:
    - npm install -g @compatguard/cli
    - compatguard analyze ./src
    - compatguard gate --min-compliance=85
  artifacts:
    reports:
      compatguard: compatguard-report.json

# Install husky
npm install --save-dev husky

# Add pre-commit hook
npx husky add .husky/pre-commit "npx compatguard check --staged"

• Clean, intuitive design with dark/light mode support
• Responsive layout for desktop and mobile
• Interactive charts using Recharts
• Real-time data updates
• Customizable widgets and layouts

• Collapsible sidebar with icon-based navigation
• Quick project switcher in header
• Breadcrumb navigation
• Keyboard shortcuts for power users

• WCAG 2.1 AA compliant
• Screen reader support
• Keyboard navigation
• High contrast mode
• Focus indicators

• Angular Framework Support - Complete integration with Angular 17+
• Plugin Marketplace - Community-driven plugins and rules
• Enhanced Dashboard Widgets - Customizable analytics widgets

• Enhanced AI Capabilities - GPT-4 powered migration assistant
• Real-time Collaboration - Multi-user project management
• Advanced Caching - Improved performance for large codebases

• Automated Migration PRs - AI-generated pull requests
• Visual Regression Testing - Screenshot-based compatibility checks
• Performance Budgets - Integration with Lighthouse and WebPageTest

• Enterprise Features - SSO, RBAC, audit logs
• Multi-repository Support - Monorepo and multi-repo management
• Advanced Analytics - ML-powered trend prediction

• Multi-user workspace management
• Role-based access control (RBAC)
• Activity audit logs
• Team performance metrics

• SOC 2 Type II certified
• GDPR compliant data handling
• On-premises deployment options
• SSO/SAML integration

• 24/7 email and chat support
• Dedicated success manager
• Custom integration assistance
• Priority feature requests

• Video Tutorials - Step-by-step guides
• Blog - Best practices and case studies
• Newsletter - Monthly updates
• Webinars - Live Q&A sessions

• Discord Server - Community chat
• Twitter - Updates and tips
• LinkedIn - Professional network

Read how teams use CompatGuard:

• E-commerce: 40% faster migration
• SaaS: 95% compliance in 3 months
• Agency: Managing 50+ client projects