frontend_requirements.md

Frontend Requirements

Overview

This document outlines the technical requirements for the React frontend of the Lin application.

Core Technologies

• React 18+
• React Router v6+
• Redux Toolkit for state management
• Axios for HTTP requests
• Material-UI (MUI) for UI components
• Formik for form handling
• Yup for form validation

Development Tools

• Node.js 16+
• npm or yarn package manager
• Create React App or Vite for project setup
• ESLint for code linting
• Prettier for code formatting
• Jest and React Testing Library for testing

Package Dependencies

Core Dependencies

{
  "@mui/material": "^5.0.0",
  "@mui/icons-material": "^5.0.0",
  "@reduxjs/toolkit": "^1.8.0",
  "axios": "^0.27.0",
  "formik": "^2.2.9",
  "react": "^18.0.0",
  "react-dom": "^18.0.0",
  "react-redux": "^8.0.0",
  "react-router-dom": "^6.3.0",
  "yup": "^0.32.11"
}

Development Dependencies

{
  "@testing-library/jest-dom": "^5.16.4",
  "@testing-library/react": "^13.3.0",
  "@testing-library/user-event": "^14.2.0",
  "eslint": "^8.18.0",
  "prettier": "^2.7.1",
  "jest": "^28.1.1"
}

Browser Support

• Latest versions of Chrome, Firefox, Safari, and Edge
• Mobile browsers (iOS Safari, Chrome for Android)
• Responsive design for all screen sizes

UI/UX Requirements

Design System

• Consistent color palette based on brand colors
• Typography hierarchy with appropriate font sizes
• Spacing system using consistent units
• Component library with reusable UI elements

Responsive Design

• Mobile-first approach
• Flexible grid system
• Adaptive components for different screen sizes
• Touch-friendly interface elements

Accessibility

• WCAG 2.1 AA compliance
• Proper semantic HTML
• Keyboard navigation support
• Screen reader compatibility
• Color contrast ratios meeting accessibility standards

State Management

Redux Store Structure

{
  auth: {
    user: object,
    isAuthenticated: boolean,
    loading: boolean,
    error: string
  },
  sources: {
    items: array,
    loading: boolean,
    error: string
  },
  posts: {
    items: array,
    loading: boolean,
    error: string
  },
  accounts: {
    items: array,
    loading: boolean,
    error: string
  },
  schedules: {
    items: array,
    loading: boolean,
    error: string
  }
}

Actions and Reducers

• Async thunks for API calls
• Error handling in reducers
• Loading states for async operations
• Normalized data structure for efficient lookups

Routing

Routes Structure

• / - Dashboard (protected)
• /login - Login page (public)
• /register - Registration page (public)
• /sources - Source management (protected)
• /posts - Post management (protected)
• /schedule - Scheduling (protected)
• /* - 404 page

Route Protection

• Authentication guard for protected routes
• Redirect logic for authenticated users
• Loading states during authentication checks

API Integration

Service Layer

• Axios instance with base URL configuration
• Request and response interceptors
• Error handling and transformation
• Authentication token management

API Error Handling

• Network error detection
• HTTP error status handling
• User-friendly error messages
• Retry mechanism for failed requests

Form Handling

Form Libraries

• Formik for form state management
• Yup for form validation
• Custom validation rules
• Async validation support

Form Components

• Reusable input components
• Validation error display
• Loading states during submission
• Success feedback after submission

Testing Requirements

Unit Tests

• Component rendering tests
• Redux action and reducer tests
• Utility function tests
• Hook tests

Integration Tests

• Form submission flows
• API integration tests
• Routing tests
• Authentication flow tests

Test Coverage

• Minimum 80% code coverage
• Testing of edge cases
• Mocking of external dependencies
• Continuous integration setup

Performance Requirements

Loading States

• Skeleton loaders for data fetching
• Progress indicators for long operations
• Optimistic updates where appropriate
• Error boundaries for component failures

Bundle Optimization

• Code splitting for route-based chunks
• Lazy loading for non-critical components
• Image optimization and lazy loading
• Minification and compression

Caching Strategy

• HTTP caching headers
• Client-side caching for static data
• Cache invalidation strategies
• Service worker implementation (optional)

Security Considerations

Client-Side Security

• XSS prevention through proper data escaping
• CSRF protection for forms
• Secure storage of authentication tokens
• Input validation and sanitization

Authentication

• Secure token storage (HttpOnly cookies or secure localStorage)
• Token expiration and refresh mechanisms
• Logout functionality
• Session management

Deployment Requirements

Build Process

• Production build optimization
• Environment-specific configuration
• Asset fingerprinting for cache busting
• Source map generation for debugging

Hosting

• Static file hosting (Netlify, Vercel, or similar)
• CDN integration for asset delivery
• SSL certificate for HTTPS
• Custom domain support

CI/CD

• Automated testing on pull requests
• Automated deployment on merge to main branch
• Environment-specific deployments
• Rollback capabilities