Technical Documentation

Comprehensive technical documentation for developers and system administrators working with TrafficPOS.

Architecture Documentation

System Architecture (Claude)

Complete system overview and architecture

Detailed technical architecture including offline-first design, state management, database schema, and development guidelines.

Audience: Developers | Difficulty: Advanced | Time: 30 minutes

Feature Development Plan

Completed development features and roadmap

Comprehensive list of implemented features, development status, and future enhancement plans.

Audience: Developers & Project Managers | Difficulty: Intermediate | Time: 20 minutes

Employee/User Merge Plan

System architecture improvements

Technical plan for merging employee and user management systems for improved architecture.

Audience: Developers | Difficulty: Advanced | Time: 25 minutes

Backend Integration

API Requirements

Backend API specifications

Complete API documentation including endpoints, authentication, data models, and integration patterns.

Audience: Backend Developers | Difficulty: Advanced | Time: 45 minutes

Security Guide

Security implementation and best practices

Comprehensive security guide covering encryption, authentication, compliance, and data protection.

Audience: Security Engineers | Difficulty: Advanced | Time: 60 minutes

Deployment Guide

Production deployment procedures

Complete deployment guide for cloud and on-premises installations with security and optimization.

Audience: DevOps Engineers | Difficulty: Advanced | Time: 90 minutes

Local Backup Server

Durable local data backup system

Technical documentation for the standalone backup server that protects data from browser crashes and clearing.

Audience: System Administrators | Difficulty: Intermediate | Time: 30 minutes

Development Resources

🛠️ Technology Stack

Frontend Technologies

  • React 18 - UI framework with hooks and modern patterns
  • TypeScript - Type-safe development with strict mode
  • Vite - Fast build tool and development server
  • Tailwind CSS - Utility-first CSS framework
  • Zustand - Lightweight state management
  • Dexie.js - IndexedDB wrapper for local storage
  • Workbox - Service worker and PWA functionality

Development Tools

  • ESLint - Code linting and quality enforcement
  • Prettier - Code formatting
  • Vitest - Unit and integration testing
  • React Testing Library - Component testing
  • PostCSS - CSS processing

🔧 Development Guidelines

Code Standards

  • Follow TypeScript strict mode requirements
  • Use functional components with hooks
  • Implement proper error boundaries
  • Follow accessibility (a11y) best practices
  • Write comprehensive tests for new features

Architecture Principles

  • Offline-first design patterns
  • Progressive Web App (PWA) requirements
  • State management with Zustand stores
  • Local-first data persistence
  • Service worker for background sync

API Integration Patterns

Offline-First Architecture

  • Local Storage: IndexedDB with Dexie.js
  • State Management: Zustand with persistence
  • Sync Strategy: Service workers with background sync
  • Conflict Resolution: Last-write-wins with timestamps

Online Mode Integration

  • REST API: JSON API with Bearer token auth
  • Real-time Sync: WebSocket connections
  • Batch Operations: Bulk API endpoints
  • Error Handling: Retry logic with exponential backoff

Data Models

  • Products: Hierarchical categories with variants
  • Sales: Immutable transaction records
  • Users: Role-based access control (RBAC)
  • Inventory: Real-time stock tracking

Development Workflow

Local Development Setup

1

Environment Setup

# Clone repository
git clone https://github.com/trafficpos/pos-frontend.git
cd pos-frontend

# Install dependencies
npm install

# Start development server
npm run dev
2

Development Commands

# Type checking
npm run typecheck

# Linting
npm run lint

# Testing
npm run test
npm run test:ui
npm run test:coverage

# Build for production
npm run build

Testing Strategy

  • Unit Tests: Component logic and utility functions
  • Integration Tests: Store interactions and API calls
  • E2E Tests: Complete user workflows
  • Visual Tests: Component appearance and responsiveness

Performance Optimization

Bundle Optimization

  • Code splitting with dynamic imports
  • Tree shaking for unused code removal
  • Asset optimization and compression
  • Lazy loading for non-critical components

Runtime Performance

  • React.memo for component memoization
  • useMemo and useCallback for expensive operations
  • Virtual scrolling for large lists
  • Debounced search and input handling

Data Management

  • Efficient IndexedDB queries with indexes
  • Pagination for large datasets
  • Background data synchronization
  • Optimistic UI updates

Security Considerations

🔒 Security Requirements

Data Protection

  • AES-256 encryption for sensitive data
  • Secure key derivation with PBKDF2
  • Employee PIN encryption
  • Secure backup password handling

Authentication & Authorization

  • Role-based access control (RBAC)
  • Session timeout handling
  • Secure password storage
  • API token management

Compliance

  • Cannabis industry regulations
  • PCI DSS for payment processing
  • Data retention policies
  • Audit trail requirements

Troubleshooting & Debugging

Common Development Issues

Build Errors

  • TypeScript compilation errors
  • Missing dependency issues
  • Environment variable problems
  • Vite configuration conflicts

Runtime Issues

  • Service worker registration failures
  • IndexedDB quota exceeded
  • Network connectivity problems
  • State management inconsistencies

Debugging Tools

  • Browser DevTools: Console, Network, Application tabs
  • React DevTools: Component inspection and profiling
  • Zustand DevTools: State management debugging
  • Lighthouse: Performance and PWA auditing

Contributing Guidelines

📝 Contribution Process

Code Contributions

  1. Fork repository and create feature branch
  2. Implement changes following code standards
  3. Write or update tests for new functionality
  4. Update documentation as needed
  5. Submit pull request with detailed description

Documentation Contributions

  1. Identify documentation gaps or improvements
  2. Update markdown files or HTML documentation
  3. Test documentation accuracy
  4. Submit changes via pull request

Related Resources

Complete Feature List

All 100+ features with technical implementation details

Data Management

Technical aspects of backup and recovery systems

Integration Guides

Technical integration with external systems