# Building Scalable React Applications with TypeScript As React applications grow in complexity, maintaining code quality becomes increasingly challenging. TypeScript provides the foundation for scalable architecture. ## Why TypeScript for React? - **Compile-time error detection** - Catch bugs before runtime - **Superior IDE support** - Better autocomplete and refactoring - **Self-documenting code** - Types serve as inline documentation - **Refactoring confidence** - Safe large-scale changes ## Project Structure for Scale ``` src/ ├── components/ # Reusable UI components │ ├── ui/ # Basic design system components │ └── features/ # Feature-specific components ├── hooks/ # Custom React hooks ├── stores/ # State management ├── types/ # TypeScript type definitions ├── utils/ # Pure utility functions └── pages/ # Route components ``` ## Component Architecture ### Compound Components Pattern ```typescript interface TabsProps { children: React.ReactNode defaultValue?: string } export function Tabs({ children, defaultValue }: TabsProps) { const [activeTab, setActiveTab] = useState(defaultValue) return ( {children} ) } Tabs.List = TabsList Tabs.Trigger = TabsTrigger Tabs.Content = TabsContent ``` Usage: ```tsx Overview Details Overview content Details content ``` ## State Management Strategy ### Context for UI State ```typescript interface ThemeContextType { theme: 'light' | 'dark' toggleTheme: () => void } export const ThemeContext = createContext(null) export function useTheme() { const context = useContext(ThemeContext) if (!context) { throw new Error('useTheme must be used within ThemeProvider') } return context } ``` ### External State for Data ```typescript // Using Zustand for complex state interface AppState { user: User | null posts: Post[] setUser: (user: User) => void addPost: (post: Post) => void } export const useAppStore = create((set) => ({ user: null, posts: [], setUser: (user) => set({ user }), addPost: (post) => set((state) => ({ posts: [...state.posts, post] })), })) ``` ## Performance Optimization ### Smart Component Splitting ```typescript // Lazy load heavy components const HeavyChart = lazy(() => import('./HeavyChart')) function Dashboard() { return (

) } ``` ### Memoization Strategy ```typescript // Memoize expensive calculations const expensiveValue = useMemo(() => { return heavyCalculation(data) }, [data]) // Memoize callback functions const handleClick = useCallback((id: string) => { onItemClick(id) }, [onItemClick]) ``` ## Testing Architecture ```typescript // Component testing with React Testing Library import { render, screen, fireEvent } from '@testing-library/react' import { Button } from './Button' describe('Button', () => { it('calls onClick when clicked', () => { const handleClick = jest.fn() render() fireEvent.click(screen.getByRole('button')) expect(handleClick).toHaveBeenCalledTimes(1) }) }) ``` Building scalable React applications is about making intentional architectural decisions that support long-term maintainability and team productivity.

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Scalable React TypeScript Architecture - Complete Guide