🎉 Implement Complete Graph Analyzer for Nexus IoC

📋 Executive Summary

This PR implements a complete static analysis tool for Nexus IoC dependency injection graphs. The @nexus-ioc/graph-analyzer package analyzes TypeScript code without execution, extracting complete dependency metadata and generating both JSON and visual (PNG) outputs.

Key Achievements:

✅ Phase 1: Complete dependency injection metadata extraction
✅ Phase 2: JSON output format and CLI interface
✅ Documentation: Comprehensive docs (README, Architecture, CLI Guide, API Reference)
✅ Publishing Ready: Fully configured for npm with optimized package size

Related Issue: Closes #25

🎯 What This PR Delivers

Core Features

🔍 Dependency Extraction
- Constructor dependencies from @Inject decorators
- Property dependencies from @Inject decorators
- Optional dependency detection via @Optional
- Support for class, string, and symbol tokens
- TC39 Stage 3 decorator support (static dependencies arrays)
- Automatic import resolution and class file loading
📊 JSON Output Format
- Structured graph output with modules, providers, and metadata
- Complete dependency information for each provider
- Module relationships (imports, exports, providers)
- Analysis metadata (timestamp, version, statistics)
🖥️ Command-Line Interface
- Easy-to-use CLI with intuitive options
- Multiple output formats (JSON, PNG, or both)
- Automatic tsconfig.json discovery
- Helpful error messages and usage documentation
📚 Comprehensive Documentation
- Complete README with quick start guide
- Architecture documentation explaining internal design
- CLI usage guide with all options and examples
- API reference for programmatic usage
- JSDoc comments on all exported APIs
📦 Publishing Ready
- Scoped package name: @nexus-ioc/graph-analyzer
- Optimized package size (43.5 kB, 69 files)
- Complete TypeScript declarations
- Proper npm configuration

📊 Statistics & Metrics

Code Metrics

Source Files: 21 TypeScript files
Lines of Code: 2,386 lines (excluding tests)
Test Files: 3 test suites
Test Lines: 1,095 lines
Documentation: 2,879 lines across 5 markdown files

Test Coverage

File                      | % Stmts | % Branch | % Funcs | % Lines
--------------------------|---------|----------|---------|--------
All files                 |   82.49 |    81.55 |   84.61 |   82.49
 parser                   |   91.56 |    86.36 |   91.66 |   91.56
  dependency-extractor.ts |   91.56 |    86.36 |   91.66 |   91.56
 parser/provider          |   46.92 |    85.71 |   66.66 |   46.92
  class-parser.ts         |   46.92 |    85.71 |   66.66 |   46.92
 visualize                |   96.13 |    65.21 |     100 |   96.13
  json-formatter.ts       |   96.13 |    65.21 |     100 |   96.13
--------------------------|---------|----------|---------|--------

Test Suites: 3 passed, 3 total
Tests:       35 passed, 35 total

Package Size

Package size: 43.5 kB (23% reduction from initial)
Unpacked size: 189.5 kB (31% reduction)
Total files: 69 files (excludes tests and dev files)

🚀 CLI Usage Examples

Installation

# Install locally in project
npm install @nexus-ioc/graph-analyzer --save-dev

# Or install globally
npm install -g @nexus-ioc/graph-analyzer

Basic Usage

# Analyze and generate both JSON and PNG
graph-analyzer src/main.ts

# Generate only JSON output
graph-analyzer -f json -o output.json src/main.ts

# Generate only PNG visualization
graph-analyzer -f png -o graph.png src/main.ts

# Specify custom tsconfig.json
graph-analyzer -c ./tsconfig.app.json src/main.ts

Example Output

$ graph-analyzer -f json -o graph.json src/entry.ts

Analyzing: /path/to/src/entry.ts
Using tsconfig: /path/to/tsconfig.json
JSON output written to: graph.json

Analysis complete!

Generated JSON structure:

{
  "modules": [
    {
      "name": "AppsModule",
      "path": "/path/to/apps/index.ts",
      "imports": ["UserModule", "PostsModule"],
      "exports": [],
      "providers": [],
      "isGlobal": false
    }
  ],
  "providers": [
    {
      "token": "HttpService",
      "type": "Class",
      "module": "HttpModule",
      "scope": "Singleton",
      "dependencies": [
        {
          "type": "constructor",
          "index": 0,
          "token": "URL",
          "tokenType": "string",
          "optional": false
        }
      ]
    }
  ],
  "metadata": {
    "entryPoint": "/path/to/src/entry.ts",
    "rootModule": "AppsModule",
    "analyzedAt": "2025-10-18T10:12:44.507Z",
    "version": "1.0.0",
    "totalModules": 6,
    "totalProviders": 8
  }
}

💻 Programmatic API Usage

import { GraphAnalyzer, ParseEntryFile, ParseTsConfig } from '@nexus-ioc/graph-analyzer';

// Parse entry file
const tsConfig = new ParseTsConfig(configContent, basePath);
const entryFile = new ParseEntryFile(sourceFile, 'src/main.ts', tsConfig);
entryFile.parse();

// Build graph and analyze
const graph = new Map();
graph.set('entry', entryFile);

const analyzer = new GraphAnalyzer(graph, 'src/main.ts', {
  outputFormat: 'json'
});

const output = analyzer.parse();
console.log(`Found ${output.metadata.totalProviders} providers`);

📝 Implementation Details

Phase 1: Dependency Injection Metadata Extraction

Commit: d03ce9de

Created DependencyExtractor class with comprehensive AST parsing
Enhanced ClassParser to load and parse class files from imports
Enhanced UseClassParser to extract dependencies from referenced classes
Added support for both legacy decorators and TC39 Stage 3 patterns
Tests: 28 unit tests with 77.5% coverage

Phase 2: JSON Output Format & CLI Interface

Commit: 2e9a23fe

Created structured GraphOutput, ModuleInfo, ProviderInfo interfaces
Implemented JsonFormatter class for JSON serialization
Built complete CLI with argument parsing and help documentation
Added support for multiple output formats (json, png, both)
Tests: 7 unit tests for JsonFormatter (94.2% coverage)
Total: 35 tests passing with 80.79% overall coverage

Phase 3: Comprehensive Documentation

Commit: 47062fa

README.md (317 lines): Installation, quick start, CLI reference
docs/ARCHITECTURE.md (486 lines): Technical architecture and design
docs/CLI_GUIDE.md (576 lines): Complete CLI usage guide
docs/API_REFERENCE.md (747 lines): Programmatic API documentation
Added JSDoc comments to all exported classes and interfaces

Phase 4: Publishing Preparation

Commit: bfc0b04

Updated package name to @nexus-ioc/graph-analyzer
Added keywords for npm discoverability
Created .npmignore to exclude dev files
Optimized package size (23% reduction)
Added prepublishOnly script
Tested with npm pack and npm link

🔄 Breaking Changes

GraphAnalyzer Constructor

Before: new GraphAnalyzer(graph, options)
After: new GraphAnalyzer(graph, entryPoint, options)
Reason: Entry point is required for metadata generation
Migration: Add entry point as second parameter

✅ Testing

All tests pass successfully:

$ npm test

PASS src/visualize/__tests__/json-formatter.spec.ts
PASS src/parser/__tests__/dependency-extractor.spec.ts
PASS src/parser/provider/__tests__/class-parser.spec.ts

Test Suites: 3 passed, 3 total
Tests:       35 passed, 35 total

Manual Testing:

✅ CLI tested with npm link and example project
✅ JSON output validated with real Nexus IoC application
✅ PNG generation tested with Graphviz
✅ TypeScript declarations verified
✅ Package contents verified with npm pack --dry-run

📚 Documentation

Complete documentation is available:

README.md: Quick start and overview
ARCHITECTURE.md: Technical design
CLI_GUIDE.md: CLI usage
API_REFERENCE.md: Programmatic API

🎯 Future Enhancements (Optional)

The following features could be added in future PRs:

Enhanced Error Handling (P1)
- Circular dependency detection
- Validation warnings for missing providers
- Better error messages with suggestions
Additional Output Formats (P2)
- Interactive HTML visualization
- Mermaid diagram format
- DOT format for custom Graphviz styling
Analysis Features (P2)
- Unused provider detection
- Dependency graph metrics
- Performance analysis

🙏 Review Checklist

📦 Commits

This PR includes 6 commits:

eede331 - Initial static analyzer setup
3563bb7 - Enhanced parser implementation
d03ce9d - Phase 1: Dependency extraction (28 tests)
2e9a23f - Phase 2: JSON output & CLI (7 tests)
47062fa - Phase 3: Comprehensive documentation
bfc0b04 - Phase 4: Publishing preparation

Ready for review and merge! 🚀

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🎉 Implement Complete Graph Analyzer for Nexus IoC

📋 Executive Summary

🎯 What This PR Delivers

Core Features

📊 Statistics & Metrics

Code Metrics

Test Coverage

Package Size

🚀 CLI Usage Examples

Installation

Basic Usage

Example Output

💻 Programmatic API Usage

📝 Implementation Details

Phase 1: Dependency Injection Metadata Extraction

Phase 2: JSON Output Format & CLI Interface

Phase 3: Comprehensive Documentation

Phase 4: Publishing Preparation

🔄 Breaking Changes

✅ Testing

📚 Documentation

🎯 Future Enhancements (Optional)

🙏 Review Checklist

📦 Commits

Uh oh!

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🎉 Implement Complete Graph Analyzer for Nexus IoC

📋 Executive Summary

🎯 What This PR Delivers

Core Features

📊 Statistics & Metrics

Code Metrics

Test Coverage

Package Size

🚀 CLI Usage Examples

Installation

Basic Usage

Example Output

💻 Programmatic API Usage

📝 Implementation Details

Phase 1: Dependency Injection Metadata Extraction

Phase 2: JSON Output Format & CLI Interface

Phase 3: Comprehensive Documentation

Phase 4: Publishing Preparation

🔄 Breaking Changes

✅ Testing

📚 Documentation

🎯 Future Enhancements (Optional)

🙏 Review Checklist

📦 Commits