Modern React Development Guide

Comprehensive guide for building scalable React applications with modern patterns, performance optimization, and best practices

🚀 Overview

This repository contains a complete set of development guides for modern React applications, focusing on JavaScript patterns, performance optimization, and maintainable code architecture. Built for teams transitioning from traditional setups to modern React development.

📚 Guide Collection

Core Development Guides

Guide	Description	Key Topics
JavaScript Guide	Modern JavaScript patterns and best practices	ES2024, async/await, modules, error handling
React Guide	React 19+ patterns and component architecture	Hooks, components, state management, performance
SOLID Principles	SOLID principles applied to React development	Component design, maintainability, architecture
Custom Hooks Guide	Hook design patterns and best practices	Hook composition, testing, performance

Configuration & Setup

Guide	Description	Key Topics
File Organization	Project structure and naming conventions	Folder structure, imports, code splitting
ESLint Configuration	Modern ESLint setup extending Airbnb	Rules, IDE integration, CI/CD
Testing Guide	Comprehensive testing with Vitest	Component testing, hooks, integration

Optimization & Migration

Guide	Description	Key Topics
Performance Guide	React performance optimization techniques	Bundle optimization, memory management, monitoring
Migration Guide	Migrating from legacy patterns and Airbnb config	Step-by-step migration, code transformation

🎯 Quick Start

1. Project Setup

# Create new React project with Vite
npm create vite@latest my-react-app -- --template react
cd my-react-app

# Install dependencies
npm install

# Install development dependencies
npm install --save-dev eslint vitest @testing-library/react

2. Configure ESLint

Follow the ESLint Configuration Guide to set up modern linting rules:

# Install ESLint dependencies
npm install --save-dev eslint-config-airbnb eslint-plugin-react-hooks
npm install --save-dev eslint-plugin-unicorn eslint-plugin-sonarjs

3. Set Up Testing

Follow the Testing Guide to configure Vitest:

# Install testing dependencies
npm install --save-dev vitest @testing-library/jest-dom @testing-library/user-event

4. Organize Project Structure

Use the File Organization Guide to structure your project:

src/
├── components/          # Reusable components
├── pages/              # Page components
├── lib/                # Utilities and helpers
├── services/           # API and external services
└── assets/             # Static assets

🏗️ Architecture Principles

Component Design

• Functional Components Only - Use hooks for all state and side effects
• Single Responsibility - Each component has one clear purpose
• Composition over Inheritance - Build complex UIs through composition
• Props Interface Design - Clear, documented prop interfaces

Performance First

• Bundle Optimization - Code splitting and tree shaking
• React Optimization - memo, useMemo, useCallback where beneficial
• Loading Strategies - Progressive enhancement and lazy loading
• Memory Management - Proper cleanup and optimization

Developer Experience

• Modern Tooling - Vite, Vitest, ESLint with modern rules
• Type Safety - PropTypes and careful data handling
• Testing Strategy - Comprehensive testing at all levels
• Documentation - Clear documentation and examples

📋 Development Workflow

1. Component Development

// Follow React Guide patterns
import { useState, useCallback } from 'react';
import PropTypes from 'prop-types';

const UserCard = ({ user, onEdit, onDelete }) => {
  const [isExpanded, setIsExpanded] = useState(false);

  const handleEdit = useCallback(() => {
    onEdit(user);
  }, [user, onEdit]);

  return (
    <div className="user-card">
      <UserAvatar user={user} />
      <UserInfo user={user} expanded={isExpanded} />
      <UserActions onEdit={handleEdit} onDelete={onDelete} />
    </div>
  );
};

UserCard.propTypes = {
  user: PropTypes.shape({
    id: PropTypes.string.isRequired,
    name: PropTypes.string.isRequired,
    email: PropTypes.string.isRequired
  }).isRequired,
  onEdit: PropTypes.func,
  onDelete: PropTypes.func
};

export default UserCard;

2. Custom Hook Development

// Follow Custom Hooks Guide patterns
const useUserData = (userId) => {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    let cancelled = false;

    const fetchUser = async () => {
      try {
        setLoading(true);
        const userData = await getUserById(userId);
        
        if (!cancelled) {
          setUser(userData);
        }
      } catch (err) {
        if (!cancelled) {
          setError(err);
        }
      } finally {
        if (!cancelled) {
          setLoading(false);
        }
      }
    };

    if (userId) {
      fetchUser();
    }

    return () => {
      cancelled = true;
    };
  }, [userId]);

  return { user, loading, error };
};

3. Testing Approach

// Follow Testing Guide patterns
import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { describe, it, expect, vi } from 'vitest';
import UserCard from './UserCard';

describe('UserCard', () => {
  const mockUser = {
    id: '1',
    name: 'John Doe',
    email: '[email protected]'
  };

  it('renders user information correctly', () => {
    render(<UserCard user={mockUser} />);

    expect(screen.getByText('John Doe')).toBeInTheDocument();
    expect(screen.getByText('[email protected]')).toBeInTheDocument();
  });

  it('calls onEdit when edit button is clicked', async () => {
    const user = userEvent.setup();
    const onEdit = vi.fn();
    
    render(<UserCard user={mockUser} onEdit={onEdit} />);

    await user.click(screen.getByRole('button', { name: /edit/i }));

    expect(onEdit).toHaveBeenCalledWith(mockUser);
  });
});

🛠️ Available Scripts

{
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview",
    "test": "vitest",
    "test:ui": "vitest --ui",
    "test:coverage": "vitest run --coverage",
    "lint": "eslint src --ext .js,.jsx --max-warnings 0",
    "lint:fix": "eslint src --ext .js,.jsx --fix",
    "type-check": "tsc --noEmit"
  }
}

📦 Recommended Dependencies

Core Dependencies

# React ecosystem
npm install react react-dom react-router-dom

# State management (choose based on needs)
npm install @tanstack/react-query  # For server state
npm install @reduxjs/toolkit react-redux  # For complex client state

# UI and utilities
npm install axios date-fns

Development Dependencies

# Build tools
npm install --save-dev vite @vitejs/plugin-react

# Linting and formatting
npm install --save-dev eslint eslint-config-airbnb
npm install --save-dev eslint-plugin-react eslint-plugin-react-hooks
npm install --save-dev prettier

# Testing
npm install --save-dev vitest @testing-library/react
npm install --save-dev @testing-library/jest-dom @testing-library/user-event
npm install --save-dev jsdom

🚀 Performance Optimization

Bundle Analysis

# Analyze bundle size
npm run build
npx vite-bundle-analyzer dist

# Monitor bundle size
npm install --save-dev size-limit

Code Splitting Examples

// Route-based splitting
const Dashboard = lazy(() => import('./pages/Dashboard'));
const UserProfile = lazy(() => import('./pages/UserProfile'));

// Feature-based splitting
const AdminPanel = lazy(() => import('./features/admin/AdminPanel'));

Performance Monitoring

// Core Web Vitals
import { getCLS, getFID, getFCP, getLCP, getTTFB } from 'web-vitals';

getCLS(console.log);
getFID(console.log);
getFCP(console.log);
getLCP(console.log);
getTTFB(console.log);

🔧 IDE Configuration

VS Code Settings

{
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": true
  },
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "eslint.validate": ["javascript", "javascriptreact"]
}

Recommended Extensions

• ESLint
• Prettier - Code formatter
• ES7+ React/Redux/React-Native snippets
• Auto Rename Tag
• Bracket Pair Colorizer

🎯 Migration Path

From Airbnb Configuration

1. Update ESLint Config - Follow ESLint Configuration Guide
2. Convert Class Components - Use Migration Guide
3. Modernize Patterns - Apply React Guide patterns
4. Optimize Performance - Implement Performance Guide techniques

From Create React App

1. Migrate to Vite - Follow build tool migration in Migration Guide
2. Update Testing - Switch from Jest to Vitest
3. Reorganize Structure - Apply File Organization Guide
4. Optimize Bundle - Implement code splitting and optimization

🤝 Contributing

Adding New Patterns

1. Follow Existing Structure - Use established guide formats
2. Provide Examples - Include practical, real-world examples
3. Test Thoroughly - Ensure all examples work as expected
4. Document Rationale - Explain why patterns are recommended

Updating Guides

1. Keep Current - Update for latest React and ecosystem changes
2. Maintain Consistency - Follow established conventions
3. Add Migration Notes - Help teams transition smoothly
4. Test Examples - Verify all code examples work

📖 Additional Resources

Official Documentation

• React Documentation
• Vite Documentation
• Vitest Documentation
• ESLint Documentation

Community Resources

• React Patterns
• JavaScript Info
• Web.dev - Performance and best practices

Tools and Libraries

• React DevTools
• Redux DevTools
• React Hook Form
• TanStack Query

📄 License

This guide collection is available under the MIT License. Feel free to use, modify, and distribute as needed for your projects and teams.

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Built for modern React development 🚀

For specific implementation details, dive into the individual guides. Each guide is designed to be comprehensive yet practical, with real-world examples and clear migration paths from legacy patterns.