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‎.gitignore‎

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

‎.jestignore‎

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test-esm/
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*.mjs
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node_modules/

‎.npmignore‎

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# Development files
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.history/
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.vscode/
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.idea/
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*.swp
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*.swo
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# Test files
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test/
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test-esm/
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coverage/
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# Build and development artifacts
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.nyc_output/
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.DS_Store
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.DS_Store?
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._*
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.Spotlight-V100
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.Trashes
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ehthumbs.db
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Thumbs.db
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# Configuration files for development only
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.eslintrc*
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.prettierrc*
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.editorconfig
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# Git files
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.git/
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.gitignore
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# CI files
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.github/
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.travis.yml
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.circleci/
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# Logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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# Environment files
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.env*
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# Temporary files
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tmp/
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temp/

‎CHANGELOG.md‎

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

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