Configure Renovate

.gitignore

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+# Dependencies
+node_modules/
+
+# Test coverage
+coverage/
+
+# Logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons
+build/Release
+
+# Dependency directories
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db

.jestignore

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+test-esm/
+*.mjs
+node_modules/

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2024-12-19
+
+### Added
+- **Core NINO Validation** - Complete implementation with full HMRC compliance
+  - `validateNINO()` function with comprehensive rule validation
+  - `formatNINO()` for standard UK government spacing (AB 12 34 56 C)
+  - `parseNINO()` to extract NINO components into structured data
+  - `generateRandomNINO()` for testing and development purposes
+
+- **Validation Features**
+  - Full compliance with HMRC NINO rules and regulations
+  - Invalid prefix validation (BG, GB, NK, KN, TN, NT, ZZ, etc.)
+  - Invalid first/second letter validation (D, F, I, Q, U, V)
+  - Invalid suffix validation (D, F, I, Q, U, V)
+  - Repeated digit pattern validation (prevents 111111, 222222, etc.)
+  - Comprehensive validation options:
+    - `allowSpaces` - Allow spaces in input (default: true)
+    - `requireSuffix` - Require suffix letter (default: false)
+
+- **Module Support & Compatibility**
+  - **CommonJS Support** - Traditional `require()` syntax
+  - **ESM Module Support** - Modern `import/export` syntax
+  - **Dual Package Exports** - Seamless support for both module systems
+  - **TypeScript Declaration Files** - Complete type definitions for enhanced IDE support
+  - **Browser Compatibility** - Works in all modern browsers
+  - **Cross-platform Support** - Node.js 14+ on all platforms
+
+- **Performance & Benchmarking**
+  - **Blazing Fast Performance** - 5,000,000+ operations per second
+  - **Comprehensive Benchmark Suite** - Detailed performance analysis and optimization
+    - Full benchmark suite (`npm run benchmark`) with memory analysis and pattern testing
+    - CI-friendly lightweight benchmarks (`npm run benchmark:ci`) with pass/fail gates
+    - Memory-focused benchmarks (`npm run benchmark:memory`) with garbage collection control
+  - **Performance Ratings System** - Automatic threshold validation (Excellent/Good/Poor)
+  - **High-Resolution Timing** - Nanosecond precision benchmarks using `process.hrtime.bigint()`
+  - **Memory Profiling** - Detailed usage tracking and leak detection
+  - **Performance Insights** - Automated analysis comparing different input types
+  - **Bulk Processing** - 3,000,000+ NINOs per second in batch operations
+
+- **Development & Testing**
+  - **Zero Dependencies** - No external packages required
+  - **100% Test Coverage** - Comprehensive test suite for all functionality
+  - **ESM Test Suite** - Dedicated tests for ES Module functionality
+  - **Jest Integration** - Professional testing setup with coverage reporting
+  - **ESLint Configuration** - Code quality and consistency enforcement
+  - **CI Integration** - Performance benchmark gates to prevent regressions
+
+- **Documentation & Examples**
+  - **Comprehensive README** - Complete usage guide with examples
+  - **JSDoc Documentation** - Detailed function documentation with examples
+  - **API Reference** - Complete function signatures and parameters
+  - **Real-world Examples** - Form validation, database storage, test data generation
+  - **TypeScript Integration Guide** - Usage examples with type safety
+  - **Browser Usage Instructions** - CDN and direct usage examples
+  - **Performance Guidelines** - Optimization tips and benchmark interpretation
+  - **Benchmark Documentation** - Detailed analysis and usage instructions
+
+- **Enhanced Error Messages** - Comprehensive detailed validation with `validateNINOWithDetails()`
+  - Machine-readable error codes for programmatic handling
+  - Human-readable error messages with specific problem identification
+  - Helpful suggestions for fixing common validation issues
+  - Structured ValidationResult object with isValid, error, errorCode, and suggestion fields
+
+- **Additional Validation Edge Cases** - Extended input validation and error handling
+  - Null and undefined input handling with specific error messages
+  - Type validation for non-string inputs (arrays, objects, booleans, numbers)
+  - Empty string and whitespace-only input validation
+  - Extremely long input protection (security consideration)
+  - Special character and Unicode rejection (emojis, symbols, control characters)
+  - Enhanced space handling with configurable allowSpaces option
+  - Detailed length validation with character count reporting
+  - Format-specific error detection (prefix format, number format, suffix format)
+  - Individual letter validation with specific error codes for HMRC rules
+  - Number pattern validation including repeated digit detection
+  - Enhanced prefix validation with specific invalid prefix reporting
+
+- **Extended Browser Compatibility Testing** - Comprehensive cross-platform validation
+  - Interactive browser test suite (`test/browser-compatibility.html`)
+  - Environment detection and reporting (browser, platform, viewport)
+  - Function availability testing across different JavaScript environments
+  - Performance benchmarking in browser environments (10,000+ ops/sec validation)
+  - Real-time interactive validation testing with all functions
+  - Cross-browser compatibility verification for modern browsers
+  - Mobile and desktop browser support validation
+  - Error handling verification in browser contexts
+
+### Enhanced Features
+- **Validation Function Architecture** - Improved code organization and maintainability
+  - Helper functions to reduce complexity in main validation logic
+  - Step-by-step validation process with clear error points
+  - Consistent error handling patterns across all validation stages
+  - Performance optimization through efficient error-first validation
+  - Clean separation of concerns between validation logic and error reporting
+
+- **Testing Coverage** - Expanded test suite with 150+ additional test cases
+  - Comprehensive edge case testing for all input types
+  - Error message validation and error code verification
+  - Unicode and special character handling tests
+  - Performance and memory validation testing
+  - Browser environment compatibility testing
+  - Interactive testing capabilities for manual verification
+
+- **TypeScript Support** - Enhanced type definitions and exports
+  - ValidationResult interface for detailed error responses
+  - Complete function signatures with new validateNINOWithDetails
+  - Updated module exports for both CommonJS and ESM
+  - Enhanced JSDoc documentation with detailed examples
+
+### Security
+- **Input Validation** - Comprehensive validation for all functions
+- **Safe Handling** - Graceful handling of null/undefined inputs
+- **Infinite Loop Protection** - Safeguards in random generation algorithms
+- **Type Safety** - Runtime validation with TypeScript support
+
+### Performance
+- **Documented Performance** - Verified 700,000+ to 5,000,000+ operations per second
+- **Memory Efficiency** - <0.1MB memory usage for 10,000 operations
+- **Performance Baselines** - Established benchmarks for regression detection
+- **All Functions Rated "Excellent"** - Consistently >100,000 ops/sec performance
+- **Zero Performance Degradation** - Maintains speed with large datasets
+
+### Technical Details
+- **Package Structure** - Dual exports in package.json for module compatibility
+- **Build System** - npm scripts for testing both CommonJS and ESM modules
+- **Configuration Files** - Jest, ESLint, and TypeScript configurations
+- **Error Code System** - Standardized machine-readable error identification
+  - NULL_INPUT, INVALID_TYPE, EMPTY_INPUT, INPUT_TOO_LONG
+  - SPACES_NOT_ALLOWED, INVALID_CHARACTERS, TOO_SHORT, TOO_LONG
+  - INVALID_PREFIX_FORMAT, INVALID_NUMBER_FORMAT, MISSING_REQUIRED_SUFFIX
+  - INVALID_SUFFIX_FORMAT, INVALID_FORMAT, INVALID_PREFIX
+  - INVALID_FIRST_LETTER, INVALID_SECOND_LETTER, INVALID_SUFFIX
+  - INVALID_NUMBER_PATTERN
+- **Browser Test Suite Features**
+  - Real-time validation testing with immediate feedback
+  - Performance benchmarking (typically 50,000+ ops/sec in browsers)
+  - Random NINO generation with validation verification
+  - Interactive input testing with all available functions
+  - Environment detection and compatibility reporting
+- **File Structure**:
+  - `index.js` - CommonJS module
+  - `index.mjs` - ES Module version
+  - `index.d.ts` - TypeScript declarations
+  - `test/` - CommonJS test suite
+  - `test-esm/` - ESM test suite
+  - `test/browser-compatibility.html` - Browser test suite
+  - `benchmark/` - Performance testing suite
+
+## [Unreleased]
+
+### Added
+- **Internationalization (i18n) Support** - Multi-language error messages and localization
+  - Full support for English (`en`) and Greek (`el`) languages
+  - `setLanguage()` function to switch between supported languages
+  - `getCurrentLanguage()` to get current language setting
+  - `getSupportedLanguages()` to list all available languages
+  - `isLanguageSupported()` to check language availability
+  - `detectLanguage()` for automatic language detection from environment
+  - `initializeI18n()` for automatic setup with options
+  - All error messages translated into Greek with proper parameter interpolation
+  - Language switching maintains error codes for consistent programming interfaces
+  - Browser and Node.js environment detection for automatic language selection
+  - Comprehensive test coverage for both languages with 34+ i18n-specific tests
+  - Full TypeScript declarations for all internationalization functions
+
+### Planned
+- Additional validation rules based on user feedback  
+- Performance monitoring and analytics integration
+
+---
+
+## Version History
+
+- **1.0.0** - Complete initial release with full HMRC compliance, dual module support, comprehensive benchmarking, and documentation
+
+## Support
+
+For questions, bug reports, or feature requests:
+- 📧 Email: [email protected]
+- 🐛 Issues: [GitHub Issues](https://github.com/icodenet/nino-validator/issues)
+- 💬 Discussions: [GitHub Discussions](https://github.com/icodenet/nino-validator/discussions)