## 📚 Mundarija 1. [React Architecture: Lead Developer Perspective](#react-architecture-lead-developer-perspective) 2. [Project Structure va Monorepo](#project-structure-va-monorepo) 3. [State Management Strategy](#state-management-strategy) 4. [Component Design Patterns](#component-design-patterns) 5. [Performance Optimization](#performance-optimization) 6. [Testing Strategy](#testing-strategy) 7. [CI/CD va Deployment](#cicd-va-deployment) 8. [Code Quality va Developer Experience](#code-quality-va-developer-experience) 9. [Security va Error Handling](#security-va-error-handling) 10. [Team Leadership va Best Practices](#team-leadership-va-best-practices) --- ## 🏗️ React Architecture: Lead Developer Perspective Senior Team Lead sifatida siz nafaqat kod yozasiz, balki **architectural decisions** qabul qilasiz, **team best practices** ni belgilaysiz va **scalability** ni ta'minlaysiz. ### Asosiy Prinsiplar | Prinsip | Tavsif | |---------|--------| | **Separation of Concerns** | UI, biznes logika, data layer alohida | | **Single Responsibility** | Har bir komponent/function faqat bir ishni bajaradi | | **DRY (Don't Repeat Yourself)** | Kodni qayta ishlatish | | **Composition over Inheritance** | Komponentlarni birlashtirish orqali yaratish | | **Loose Coupling** | Modullar bir-biriga kam bog'liq | | **High Cohesion** | Bog'liq funksiyalar bir joyda | --- ## 📁 Project Structure va Monorepo ### 1. Monorepo Architecture (Nx/Turborepo) ``` my-monorepo/ ├── apps/ │ ├── web/ # Main web application │ │ ├── app/ # Next.js App Router │ │ ├── components/ │ │ ├── hooks/ │ │ ├── utils/ │ │ └── public/ │ ├── admin/ # Admin dashboard │ ├── mobile/ # React Native app │ └── docs/ # Documentation site ├── packages/ │ ├── ui/ # Shared UI components │ │ ├── src/ │ │ │ ├── atoms/ │ │ │ ├── molecules/ │ │ │ ├── organisms/ │ │ │ └── templates/ │ │ ├── index.ts │ │ └── package.json │ ├── api/ # API client │ │ ├── src/ │ │ │ ├── client.ts │ │ │ ├── hooks/ │ │ │ └── types.ts │ │ └── package.json │ ├── config/ # Shared configs │ │ ├── eslint/ │ │ ├── typescript/ │ │ └── prettier/ │ ├── utils/ # Shared utilities │ ├── hooks/ # Shared React hooks │ └── types/ # Shared TypeScript types ├── tools/ │ ├── generators/ # Code generators │ └── scripts/ # Build scripts ├── .github/ │ └── workflows/ ├── nx.json ├── turbo.json ├── package.json ├── tsconfig.base.json └── README.md ``` ### 2. Application Structure (Feature-based) ``` apps/web/src/ ├── app/ # Next.js App Router │ ├── (auth)/ │ │ ├── login/ │ │ │ └── page.tsx │ │ └── register/ │ │ └── page.tsx │ ├── (dashboard)/ │ │ ├── dashboard/ │ │ │ └── page.tsx │ │ └── settings/ │ │ └── page.tsx │ ├── api/ # API routes │ └── layout.tsx ├── features/ # Feature modules │ ├── auth/ │ │ ├── components/ │ │ ├── hooks/ │ │ ├── services/ │ │ ├── types/ │ │ ├── utils/ │ │ └── index.ts │ ├── dashboard/ │ ├── users/ │ ├── products/ │ └── settings/ ├── lib/ # Core libraries │ ├── api/ │ ├── store/ │ ├── hooks/ │ ├── utils/ │ └── constants/ ├── shared/ # Shared resources │ ├── components/ │ ├── hooks/ │ ├── types/ │ └── utils/ ├── styles/ ├── types/ └── config/ ``` --- ## 🎯 State Management Strategy ### Layered State Management | Layer | Management | Purpose | |-------|------------|---------| | **Server State** | TanStack Query | API ma'lumotlari, caching, pagination | | **Global State** | Zustand/Jotai | User, theme, language, notifications | | **Form State** | React Hook Form | Form validation, submission | | **URL State** | Next.js Router | Query params, routing | | **Local State** | useState/useReducer | Component-specific state | ### 1. Server State (TanStack Query) ```typescript // lib/api/query-client.ts import { QueryClient, QueryClientConfig } from '@tanstack/react-query'; import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister'; import { persistQueryClient } from '@tanstack/react-query-persist-client'; // Query client configuration export const queryClientConfig: QueryClientConfig = { defaultOptions: { queries: { staleTime: 1000 * 60 * 5, // 5 minutes gcTime: 1000 * 60 * 30, // 30 minutes retry: 3, retryDelay: (attempt) => Math.min(1000 * 2 ** attempt, 30000), refetchOnWindowFocus: false, refetchOnMount: false, refetchOnReconnect: false, networkMode: 'offlineFirst', throwOnError: false, }, mutations: { retry: 1, networkMode: 'offlineFirst', }, }, }; export const queryClient = new QueryClient(queryClientConfig); // Persistence for offline support (browser only) if (typeof window !== 'undefined') { const persister = createSyncStoragePersister({ storage: window.localStorage, key: 'REACT_QUERY_OFFLINE_CACHE', throttleTime: 1000, }); persistQueryClient({ queryClient, persister, maxAge: 1000 * 60 * 60 * 24, // 24 hours }); } ``` ```typescript // features/users/services/user.service.ts import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'; import { apiClient } from '@/lib/api/client'; import { User, CreateUserDto, UpdateUserDto } from '../types'; const USER_QUERY_KEY = 'users'; // Hooks for data fetching export const userQueries = { // Get all users with pagination useUsers: (params: { page: number; limit: number }) => { return useQuery({ queryKey: [USER_QUERY_KEY, 'list', params], queryFn: async () => { const response = await apiClient.get<{ data: User[]; pagination: any }>( '/users', { params } ); return response.data; }, placeholderData: (previousData) => previousData, }); }, // Get single user useUser: (id: string) => { return useQuery({ queryKey: [USER_QUERY_KEY, 'detail', id], queryFn: async () => { const response = await apiClient.get(`/users/${id}`); return response.data; }, enabled: !!id, }); }, // Search users useSearchUsers: (searchTerm: string) => { return useQuery({ queryKey: [USER_QUERY_KEY, 'search', searchTerm], queryFn: async () => { const response = await apiClient.get('/users/search', { params: { q: searchTerm }, }); return response.data; }, enabled: searchTerm.length > 2, }); }, }; // Mutations export const userMutations = { useCreateUser: () => { const queryClient = useQueryClient(); return useMutation({ mutationFn: async (data: CreateUserDto) => { const response = await apiClient.post('/users', data); return response.data; }, onSuccess: (newUser) => { // Update cache queryClient.setQueryData([USER_QUERY_KEY, 'list'], (old) => { return old ? [...old, newUser] : [newUser]; }); queryClient.invalidateQueries({ queryKey: [USER_QUERY_KEY, 'list'], }); }, onError: (error) => { console.error('Failed to create user:', error); }, }); }, useUpdateUser: () => { const queryClient = useQueryClient(); return useMutation({ mutationFn: async ({ id, data }: { id: string; data: UpdateUserDto }) => { const response = await apiClient.patch(`/users/${id}`, data); return response.data; }, onSuccess: (updatedUser) => { // Update cache queryClient.setQueryData([USER_QUERY_KEY, 'detail', updatedUser.id], updatedUser); queryClient.invalidateQueries({ queryKey: [USER_QUERY_KEY], }); }, }); }, useDeleteUser: () => { const queryClient = useQueryClient(); return useMutation({ mutationFn: async (id: string) => { await apiClient.delete(`/users/${id}`); return id; }, onSuccess: (deletedId) => { queryClient.invalidateQueries({ queryKey: [USER_QUERY_KEY], }); queryClient.setQueryData([USER_QUERY_KEY, 'list'], (old) => { return old ? old.filter((user) => user.id !== deletedId) : []; }); }, }); }, }; ``` ### 2. Global State (Zustand) ```typescript // lib/store/auth.store.ts import { create } from 'zustand'; import { persist, devtools } from 'zustand/middleware'; import { immer } from 'zustand/middleware/immer'; import { User, AuthState } from '@/features/auth/types'; import { authService } from '@/features/auth/services/auth.service'; interface AuthStore extends AuthState { // Actions login: (email: string, password: string) => Promise; logout: () => Promise; register: (data: any) => Promise; setUser: (user: User | null) => void; setLoading: (loading: boolean) => void; setError: (error: string | null) => void; reset: () => void; } const initialState: AuthState = { user: null, token: null, isAuthenticated: false, isLoading: false, error: null, }; export const useAuthStore = create()( devtools( immer((set, get) => ({ ...initialState, login: async (email: string, password: string) => { set({ isLoading: true, error: null }); try { const { user, token } = await authService.login({ email, password }); set({ user, token, isAuthenticated: true, isLoading: false, }); } catch (error: any) { set({ error: error.message || 'Login failed', isLoading: false, }); throw error; } }, logout: async () => { set({ isLoading: true }); try { await authService.logout(); set(initialState); } catch (error: any) { set({ error: error.message || 'Logout failed', isLoading: false, }); throw error; } }, register: async (data: any) => { set({ isLoading: true, error: null }); try { const { user, token } = await authService.register(data); set({ user, token, isAuthenticated: true, isLoading: false, }); } catch (error: any) { set({ error: error.message || 'Registration failed', isLoading: false, }); throw error; } }, setUser: (user) => { set({ user, isAuthenticated: !!user }); }, setLoading: (isLoading) => { set({ isLoading }); }, setError: (error) => { set({ error }); }, reset: () => { set(initialState); }, })), { name: 'auth-store', } ) ); ``` ### 3. Form State (React Hook Form + Zod) ```typescript // features/auth/components/LoginForm.tsx 'use client'; import { useForm } from 'react-hook-form'; import { zodResolver } from '@hookform/resolvers/zod'; import { z } from 'zod'; import { useAuthStore } from '@/lib/store/auth.store'; import { Button, Input, Form, FormField, FormItem, FormLabel, FormControl, FormMessage } from '@/shared/components/ui'; // Schema const loginSchema = z.object({ email: z.string().email('Invalid email address'), password: z.string().min(6, 'Password must be at least 6 characters'), rememberMe: z.boolean().optional(), }); type LoginFormData = z.infer; export function LoginForm() { const { login, isLoading, error } = useAuthStore(); const form = useForm({ resolver: zodResolver(loginSchema), defaultValues: { email: '', password: '', rememberMe: false, }, mode: 'onBlur', }); const onSubmit = async (data: LoginFormData) => { try { await login(data.email, data.password); // Redirect handled by middleware } catch (error) { // Error is already set in store } }; return (

( Email )} /> ( Password )} /> ( Remember me )} /> {error && (

{error}

)} ); } ``` --- ## 🧩 Component Design Patterns ### 1. Atomic Design Structure ```typescript // packages/ui/src/atoms/Button/Button.tsx import { forwardRef, ButtonHTMLAttributes, ReactNode } from 'react'; import { cn } from '@repo/utils/cn'; export interface ButtonProps extends ButtonHTMLAttributes { variant?: 'primary' | 'secondary' | 'outline' | 'ghost' | 'danger'; size?: 'sm' | 'md' | 'lg'; isLoading?: boolean; leftIcon?: ReactNode; rightIcon?: ReactNode; fullWidth?: boolean; children?: ReactNode; } const variantStyles = { primary: 'bg-blue-600 text-white hover:bg-blue-700 active:bg-blue-800', secondary: 'bg-gray-200 text-gray-900 hover:bg-gray-300 active:bg-gray-400', outline: 'border-2 border-blue-600 text-blue-600 hover:bg-blue-50', ghost: 'text-gray-700 hover:bg-gray-100 hover:text-gray-900', danger: 'bg-red-600 text-white hover:bg-red-700 active:bg-red-800', }; const sizeStyles = { sm: 'px-3 py-1.5 text-sm', md: 'px-4 py-2 text-base', lg: 'px-6 py-3 text-lg', }; export const Button = forwardRef( ( { variant = 'primary', size = 'md', isLoading = false, leftIcon, rightIcon, fullWidth = false, className, children, disabled, ...props }, ref ) => { return ( ); } ); Button.displayName = 'Button'; ``` ### 2. Compound Components Pattern ```typescript // packages/ui/src/molecules/Select/Select.tsx 'use client'; import React, { createContext, useContext, useState, ReactNode } from 'react'; import { cn } from '@repo/utils/cn'; interface SelectContextType { value: string; onChange: (value: string) => void; isOpen: boolean; setIsOpen: (isOpen: boolean) => void; } const SelectContext = createContext(undefined); const useSelect = () => { const context = useContext(SelectContext); if (!context) { throw new Error('Select components must be used within Select'); } return context; }; interface SelectProps { value: string; onChange: (value: string) => void; children: ReactNode; className?: string; placeholder?: string; } const SelectRoot = ({ value, onChange, children, className, placeholder = 'Select...', }: SelectProps) => { const [isOpen, setIsOpen] = useState(false); return (

setIsOpen(!isOpen)} > {value || placeholder} ▼

{isOpen && (

{children}

)}

); }; const SelectOption = ({ value, children, className, }: { value: string; children: ReactNode; className?: string; }) => { const { value: selectedValue, onChange, setIsOpen } = useSelect(); const handleClick = () => { onChange(value); setIsOpen(false); }; const isSelected = selectedValue === value; return (

{children}

); }; export const Select = Object.assign(SelectRoot, { Option: SelectOption, }); ``` ### 3. Render Props Pattern ```typescript // shared/components/DataFetcher/DataFetcher.tsx import { ReactNode, useEffect, useState } from 'react'; import { useQuery, UseQueryOptions } from '@tanstack/react-query'; interface DataFetcherProps { queryKey: string[]; queryFn: () => Promise; options?: Omit, 'queryKey' | 'queryFn'>; children: (props: { data: TData | undefined; isLoading: boolean; isError: boolean; error: TError | null; refetch: () => void; }) => ReactNode; loadingComponent?: ReactNode; errorComponent?: (error: TError, refetch: () => void) => ReactNode; } export function DataFetcher({ queryKey, queryFn, options, children, loadingComponent, errorComponent, }: DataFetcherProps) { const { data, isLoading, isError, error, refetch } = useQuery({ queryKey, queryFn, ...options, }); if (isLoading) { return loadingComponent || ; } if (isError) { return errorComponent ? ( errorComponent(error as TError, refetch) ) : ( ); } return children({ data, isLoading, isError, error: null, refetch }); } const DefaultLoading = () => (

); const DefaultError = ({ error, refetch }: any) => (

Error loading data

{error?.message}

); ``` ### 4. Container/Presentational Pattern ```typescript // features/users/components/UserList.container.tsx 'use client'; import { useUsers } from '../services/user.service'; import { UserListPresenter } from './UserList.presenter'; import { useState } from 'react'; export function UserListContainer() { const [page, setPage] = useState(1); const { data, isLoading, isError, error } = useUsers({ page, limit: 10 }); const handlePageChange = (newPage: number) => { setPage(newPage); }; const handleRefresh = () => { // Refresh logic }; return ( ); } ``` ```typescript // features/users/components/UserList.presenter.tsx import { User } from '../types'; import { UserCard } from './UserCard'; import { Pagination } from '@/shared/components/ui'; import { LoadingSpinner } from '@/shared/components/ui'; interface UserListPresenterProps { users: User[]; pagination?: { page: number; totalPages: number; total: number; }; isLoading: boolean; isError: boolean; error: Error | null; onPageChange: (page: number) => void; onRefresh: () => void; } export function UserListPresenter({ users, pagination, isLoading, isError, error, onPageChange, onRefresh, }: UserListPresenterProps) { if (isLoading) { return (

); } if (isError) { return (

Failed to load users

{error?.message}

); } if (users.length === 0) { return (

No users found

); } return (

{users.map((user) => ( ))}

{pagination && pagination.totalPages > 1 && (

)}

); } ``` --- ## ⚡ Performance Optimization ### 1. Code Splitting ```typescript // app/layout.tsx 'use client'; import { Suspense, lazy } from 'react'; import { LoadingSpinner } from '@/shared/components/ui'; // Lazy load heavy components const HeavyComponent = lazy(() => import('@/features/heavy/HeavyComponent')); export default function Layout({ children }: { children: React.ReactNode }) { return ( {children} }> ); } ``` ### 2. Memoization Strategy ```typescript // shared/hooks/useMemoizedValue.ts import { useMemo, useRef, useEffect } from 'react'; import { usePrevious } from './usePrevious'; export function useMemoizedValue( value: T, compareFn: (prev: T, next: T) => boolean = Object.is ): T { const previousRef = useRef(value); if (!compareFn(previousRef.current, value)) { previousRef.current = value; } return previousRef.current; } // Component optimization import { memo, useCallback, useMemo } from 'react'; export const OptimizedUserCard = memo(({ user, onUpdate }: UserCardProps) => { // Memoize expensive computations const fullName = useMemo(() => { return `${user.firstName} ${user.lastName}`.trim(); }, [user.firstName, user.lastName]); // Memoize callbacks const handleUpdate = useCallback(() => { onUpdate(user.id); }, [onUpdate, user.id]); // Memoize complex objects const userPermissions = useMemo(() => { return user.permissions.filter(p => p.isActive); }, [user.permissions]); return (

{fullName}

); }); OptimizedUserCard.displayName = 'OptimizedUserCard'; ``` ### 3. Virtualization (React Window) ```typescript // shared/components/VirtualList/VirtualList.tsx 'use client'; import { useRef, useEffect } from 'react'; import { FixedSizeList, VariableSizeList } from 'react-window'; import { useWindowWidth } from '@/shared/hooks/useWindowWidth'; interface VirtualListProps { items: T[]; renderItem: (item: T, index: number) => React.ReactNode; itemSize?: number; height?: number; width?: number | string; isVariableSize?: boolean; getItemSize?: (index: number) => number; } export function VirtualList({ items, renderItem, itemSize = 50, height = 500, width = '100%', isVariableSize = false, getItemSize, }: VirtualListProps) { const windowWidth = useWindowWidth(); const listRef = useRef(null); useEffect(() => { // Reset scroll position when items change listRef.current?.scrollTo(0); }, [items]); const Row = ({ index, style }: { index: number; style: React.CSSProperties }) => { const item = items[index]; if (!item) return null; return

{renderItem(item, index)}

; }; const ListComponent = isVariableSize ? VariableSizeList : FixedSizeList; return ( {Row} ); } ``` ### 4. Image Optimization ```typescript // shared/components/OptimizedImage/OptimizedImage.tsx 'use client'; import { useState, useEffect } from 'react'; import Image from 'next/image'; import { cn } from '@repo/utils/cn'; interface OptimizedImageProps { src: string; alt: string; width?: number; height?: number; sizes?: string; className?: string; quality?: number; priority?: boolean; placeholder?: 'blur' | 'empty'; blurDataURL?: string; } export function OptimizedImage({ src, alt, width, height, sizes = '(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw', className, quality = 85, priority = false, placeholder = 'empty', blurDataURL, }: OptimizedImageProps) { const [isLoading, setIsLoading] = useState(true); const [error, setError] = useState(false); // Intersection Observer for lazy loading useEffect(() => { if (priority) setIsLoading(false); }, [priority]); return (

setIsLoading(false)} onError={() => { setError(true); setIsLoading(false); }} /> {isLoading && (

)} {error && (

Failed to load image

)}

); } ``` --- ## 🧪 Testing Strategy ### 1. Unit Testing (Jest + React Testing Library) ```typescript // features/auth/components/LoginForm.test.tsx import { render, screen, fireEvent, waitFor } from '@testing-library/react'; import userEvent from '@testing-library/user-event'; import { LoginForm } from './LoginForm'; import { useAuthStore } from '@/lib/store/auth.store'; // Mock the store jest.mock('@/lib/store/auth.store'); describe('LoginForm', () => { const mockLogin = jest.fn(); beforeEach(() => { (useAuthStore as jest.Mock).mockImplementation(() => ({ login: mockLogin, isLoading: false, error: null, })); }); it('should render all form fields', () => { render(); expect(screen.getByLabelText(/email/i)).toBeInTheDocument(); expect(screen.getByLabelText(/password/i)).toBeInTheDocument(); expect(screen.getByRole('button', { name: /sign in/i })).toBeInTheDocument(); }); it('should validate email field', async () => { render(); const emailInput = screen.getByLabelText(/email/i); const submitButton = screen.getByRole('button', { name: /sign in/i }); // Test invalid email await userEvent.type(emailInput, 'invalid-email'); fireEvent.blur(emailInput); await waitFor(() => { expect(screen.getByText(/invalid email address/i)).toBeInTheDocument(); }); // Test valid email await userEvent.clear(emailInput); await userEvent.type(emailInput, 'test@example.com'); fireEvent.blur(emailInput); await waitFor(() => { expect(screen.queryByText(/invalid email address/i)).not.toBeInTheDocument(); }); }); it('should submit form with valid data', async () => { render(); await userEvent.type(screen.getByLabelText(/email/i), 'test@example.com'); await userEvent.type(screen.getByLabelText(/password/i), 'password123'); fireEvent.click(screen.getByRole('button', { name: /sign in/i })); await waitFor(() => { expect(mockLogin).toHaveBeenCalledWith('test@example.com', 'password123'); }); }); it('should show loading state while submitting', async () => { (useAuthStore as jest.Mock).mockImplementation(() => ({ login: jest.fn(), isLoading: true, error: null, })); render(); expect(screen.getByText(/signing in/i)).toBeInTheDocument(); expect(screen.getByRole('button', { name: /signing in/i })).toBeDisabled(); }); it('should display error message on login failure', async () => { const errorMessage = 'Invalid credentials'; (useAuthStore as jest.Mock).mockImplementation(() => ({ login: jest.fn().mockRejectedValue(new Error(errorMessage)), isLoading: false, error: errorMessage, })); render(); await waitFor(() => { expect(screen.getByText(errorMessage)).toBeInTheDocument(); }); }); }); ``` ### 2. Integration Testing ```typescript // __tests__/integration/auth-flow.test.tsx import { render, screen, waitFor } from '@testing-library/react'; import userEvent from '@testing-library/user-event'; import { AuthProvider } from '@/context/AuthContext'; import { LoginForm } from '@/features/auth/components/LoginForm'; // Mock API client jest.mock('@/lib/api/client'); describe('Authentication Flow Integration', () => { it('should complete login flow successfully', async () => { // Mock successful login response const mockLogin = jest.fn().mockResolvedValue({ user: { id: '1', email: 'test@example.com' }, token: 'mock-token', }); // Setup test const user = userEvent.setup(); render( ); // Fill form await user.type(screen.getByLabelText(/email/i), 'test@example.com'); await user.type(screen.getByLabelText(/password/i), 'password123'); // Submit await user.click(screen.getByRole('button', { name: /sign in/i })); // Verify navigation or success message await waitFor(() => { expect(screen.queryByRole('button', { name: /sign in/i })).not.toBeInTheDocument(); }); }); }); ``` ### 3. E2E Testing (Cypress/Playwright) ```typescript // e2e/auth.spec.ts import { test, expect } from '@playwright/test'; test.describe('Authentication Flow', () => { test.beforeEach(async ({ page }) => { await page.goto('/login'); }); test('should login successfully', async ({ page }) => { // Fill form await page.fill('[name="email"]', 'test@example.com'); await page.fill('[name="password"]', 'password123'); // Submit await page.click('button[type="submit"]'); // Wait for navigation await page.waitForURL('/dashboard'); // Verify user is logged in await expect(page.locator('[data-testid="user-menu"]')).toBeVisible(); await expect(page.locator('[data-testid="user-email"]')).toContainText('test@example.com'); }); test('should show error for invalid credentials', async ({ page }) => { await page.fill('[name="email"]', 'wrong@example.com'); await page.fill('[name="password"]', 'wrongpassword'); await page.click('button[type="submit"]'); await expect(page.locator('[role="alert"]')).toBeVisible(); await expect(page.locator('[role="alert"]')).toContainText('Invalid credentials'); }); test('should logout successfully', async ({ page }) => { // Login first await page.fill('[name="email"]', 'test@example.com'); await page.fill('[name="password"]', 'password123'); await page.click('button[type="submit"]'); await page.waitForURL('/dashboard'); // Logout await page.click('[data-testid="user-menu"]'); await page.click('[data-testid="logout-button"]'); await expect(page).toHaveURL('/login'); }); }); ``` --- ## 🚀 CI/CD va Deployment ### GitHub Actions Workflow ```yaml # .github/workflows/ci.yml name: CI/CD Pipeline on: push: branches: [main, develop] pull_request: branches: [main] env: NODE_VERSION: '20' jobs: # Quality checks quality: runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 - name: Setup Node.js uses: actions/setup-node@v3 with: node-version: ${{ env.NODE_VERSION }} cache: 'yarn' - name: Install dependencies run: yarn install --frozen-lockfile - name: Type check run: yarn type-check - name: Lint run: yarn lint - name: Format check run: yarn format:check # Tests test: runs-on: ubuntu-latest needs: quality steps: - uses: actions/checkout@v3 - name: Setup Node.js uses: actions/setup-node@v3 with: node-version: ${{ env.NODE_VERSION }} cache: 'yarn' - name: Install dependencies run: yarn install --frozen-lockfile - name: Run unit tests run: yarn test:unit --coverage - name: Upload coverage uses: codecov/codecov-action@v3 with: token: ${{ secrets.CODECOV_TOKEN }} files: ./coverage/lcov.info - name: Run integration tests run: yarn test:integration # Build build: runs-on: ubuntu-latest needs: [quality, test] if: github.event_name == 'push' && github.ref == 'refs/heads/main' steps: - uses: actions/checkout@v3 - name: Setup Node.js uses: actions/setup-node@v3 with: node-version: ${{ env.NODE_VERSION }} cache: 'yarn' - name: Install dependencies run: yarn install --frozen-lockfile - name: Build application run: yarn build - name: Upload build artifacts uses: actions/upload-artifact@v3 with: name: build path: | .next public package.json # Deploy to Vercel deploy: runs-on: ubuntu-latest needs: build if: github.event_name == 'push' && github.ref == 'refs/heads/main' steps: - name: Download build artifacts uses: actions/download-artifact@v3 with: name: build - name: Deploy to Vercel uses: amondnet/vercel-action@v20 with: vercel-token: ${{ secrets.VERCEL_TOKEN }} vercel-org-id: ${{ secrets.ORG_ID }} vercel-project-id: ${{ secrets.PROJECT_ID }} vercel-args: '--prod' # E2E Tests on Staging e2e: runs-on: ubuntu-latest needs: deploy if: github.event_name == 'push' && github.ref == 'refs/heads/main' steps: - uses: actions/checkout@v3 - name: Setup Node.js uses: actions/setup-node@v3 with: node-version: ${{ env.NODE_VERSION }} cache: 'yarn' - name: Install dependencies run: yarn install --frozen-lockfile - name: Install Playwright run: npx playwright install --with-deps - name: Run E2E tests run: yarn test:e2e env: BASE_URL: ${{ secrets.STAGING_URL }} ``` ### Vercel Configuration ```json { "name": "my-app", "version": 2, "builds": [ { "src": "apps/web/package.json", "use": "@vercel/next" } ], "env": { "NEXT_PUBLIC_API_URL": "https://api.example.com", "NEXT_PUBLIC_APP_URL": "https://myapp.com" }, "regions": ["iad1", "sin1"], "functions": { "apps/web/next.config.js": { "maxDuration": 30 } }, "rewrites": [ { "source": "/(.*)", "destination": "/apps/web/$1" } ] } ``` --- ## 🔒 Security va Error Handling ### 1. Security Best Practices ```typescript // lib/security/helmet.ts import { Helmet } from 'react-helmet'; export function SecurityHeaders() { return ( {/* Content Security Policy */} ); } ``` ### 2. Error Boundary ```typescript // shared/components/ErrorBoundary/ErrorBoundary.tsx 'use client'; import React from 'react'; import { logger } from '@/lib/logger'; interface Props { children: React.ReactNode; fallback?: React.ReactNode; onError?: (error: Error, errorInfo: React.ErrorInfo) => void; } interface State { hasError: boolean; error: Error | null; } export class ErrorBoundary extends React.Component { constructor(props: Props) { super(props); this.state = { hasError: false, error: null }; } static getDerivedStateFromError(error: Error): State { return { hasError: true, error }; } componentDidCatch(error: Error, errorInfo: React.ErrorInfo) { // Log error to service logger.error('React Error Boundary caught error:', error, errorInfo); // Call custom error handler this.props.onError?.(error, errorInfo); // Send to error reporting service if (process.env.NEXT_PUBLIC_SENTRY_DSN) { // Sentry.captureException(error, { extra: errorInfo }); } } handleReset = () => { this.setState({ hasError: false, error: null }); }; render() { if (this.state.hasError) { if (this.props.fallback) { return this.props.fallback; } return (

Something went wrong

{this.state.error?.message || 'An unexpected error occurred'}

{process.env.NODE_ENV === 'development' && (

                {this.state.error?.stack}

)}

); } return this.props.children; } } ``` --- ## 👥 Team Leadership va Best Practices ### 1. Development Standards ```typescript // .eslintrc.js module.exports = { extends: [ 'next/core-web-vitals', 'plugin:@typescript-eslint/recommended', 'plugin:react-hooks/recommended', 'plugin:jest/recommended', 'plugin:testing-library/react', 'plugin:import/typescript', 'prettier' ], plugins: [ '@typescript-eslint', 'react', 'react-hooks', 'jest', 'testing-library', 'import', 'unused-imports' ], rules: { // TypeScript '@typescript-eslint/explicit-function-return-type': 'warn', '@typescript-eslint/no-explicit-any': 'warn', '@typescript-eslint/ban-ts-comment': 'warn', '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }], // React 'react/react-in-jsx-scope': 'off', 'react/prop-types': 'off', 'react/display-name': 'warn', 'react/jsx-key': 'error', 'react/jsx-no-duplicate-props': 'error', 'react/jsx-no-target-blank': 'error', 'react-hooks/rules-of-hooks': 'error', 'react-hooks/exhaustive-deps': 'warn', // Import 'import/order': ['error', { groups: [ 'builtin', 'external', 'internal', 'parent', 'sibling', 'index', 'object', 'type' ], pathGroups: [ { pattern: 'react', group: 'external', position: 'before' }, { pattern: '@/**', group: 'internal' } ], pathGroupsExcludedImportTypes: ['react'], 'newlines-between': 'always', alphabetize: { order: 'asc', caseInsensitive: true } }], // Unused imports 'unused-imports/no-unused-imports': 'error', 'unused-imports/no-unused-vars': ['warn', { vars: 'all', varsIgnorePattern: '^_', args: 'after-used', argsIgnorePattern: '^_' }] }, settings: { 'import/resolver': { typescript: { project: './tsconfig.json' } } } }; ``` ### 2. Git Workflow ```yaml # .github/PULL_REQUEST_TEMPLATE.md ## Description ## Type of Change - [ ] 🐛 Bug fix - [ ] ✨ New feature - [ ] 🔧 Refactor - [ ] 📝 Documentation update - [ ] 🎨 UI/UX improvement - [ ] ⚡ Performance improvement - [ ] ✅ Test coverage ## How Has This Been Tested? - [ ] Unit tests - [ ] Integration tests - [ ] E2E tests - [ ] Manual testing ## Checklist - [ ] Code follows project style guidelines - [ ] Self-review completed - [ ] Documentation updated - [ ] Tests added/updated - [ ] No new warnings - [ ] All checks pass ## Screenshots (if applicable) ## Additional Notes ``` ### 3. Code Review Checklist ```markdown ## Code Review Checklist ### Architecture & Design - [ ] Follows project architecture principles - [ ] Proper separation of concerns - [ ] Scalable and maintainable - [ ] Performance considerations - [ ] Security best practices ### Code Quality - [ ] Clean, readable, and self-documenting - [ ] No duplication (DRY) - [ ] Proper error handling - [ ] Adequate logging - [ ] Type safety ### Testing - [ ] Unit tests for business logic - [ ] Integration tests for critical paths - [ ] E2E tests for user flows - [ ] Edge cases covered - [ ] Test coverage meets threshold ### Performance - [ ] Bundle size impact - [ ] Memoization where needed - [ ] Proper lazy loading - [ ] No unnecessary re-renders - [ ] API calls optimized ### Accessibility - [ ] Proper ARIA attributes - [ ] Keyboard navigation - [ ] Screen reader compatibility - [ ] Color contrast - [ ] Focus management ### Documentation - [ ] JSDoc/TSDoc comments - [ ] README updated - [ ] Storybook/UI docs - [ ] API documentation - [ ] Migration guide if needed ``` ### 4. Daily Standup Template ```markdown ## Daily Standup Meeting ### Yesterday - [ ] Task 1: [Status] [Link] - [ ] Task 2: [Status] [Link] - [ ] Task 3: [Status] [Link] ### Today - [ ] Task 1: [Priority] [Link] - [ ] Task 2: [Priority] [Link] - [ ] Task 3: [Priority] [Link] ### Blockers - [ ] Issue 1: [Description] [Assigned to] - [ ] Issue 2: [Description] [Assigned to] ### Notes - Team announcements - Dependencies - Decisions made - Questions for the team ### Metrics - Velocity: [Current] / [Target] - Code coverage: [%] - Open PRs: [Count] - Bugs: [Open] / [Closed] ``` --- ## 📊 Monitoring va Analytics ### Application Monitoring ```typescript // lib/monitoring/performance.ts import { logger } from '@/lib/logger'; interface PerformanceMetric { name: string; value: number; tags?: Record; } class PerformanceMonitor { private metrics: PerformanceMetric[] = []; measure(name: string, fn: () => T | Promise): T | Promise { const start = performance.now(); try { const result = fn(); if (result instanceof Promise) { return result.finally(() => { const duration = performance.now() - start; this.recordMetric(name, duration); }) as Promise; } const duration = performance.now() - start; this.recordMetric(name, duration); return result; } catch (error) { throw error; } } recordMetric(name: string, value: number, tags?: Record) { this.metrics.push({ name, value, tags }); // Send to monitoring service if (process.env.NODE_ENV === 'production') { // Send to DataDog/NewRelic/Sentry // datadog.timing(name, value, tags); } if (value > 1000) { logger.warn(`Performance warning: ${name} took ${value}ms`); } } getMetrics() { return this.metrics; } clear() { this.metrics = []; } } export const performanceMonitor = new PerformanceMonitor(); // Usage export function usePerformanceMonitoring(componentName: string) { useEffect(() => { performanceMonitor.recordMetric(`component.mount.${componentName}`, performance.now()); return () => { performanceMonitor.recordMetric(`component.unmount.${componentName}`, performance.now()); }; }, [componentName]); } ``` ### Analytics Integration ```typescript // lib/analytics/analytics.ts import { logger } from '@/lib/logger'; interface AnalyticsEvent { name: string; properties?: Record; userId?: string; timestamp?: Date; } class AnalyticsService { private enabled = process.env.NODE_ENV === 'production'; private userId: string | null = null; setUserId(userId: string) { this.userId = userId; } trackEvent(event: AnalyticsEvent) { if (!this.enabled) { logger.debug('Analytics event (dev):', event); return; } try { const payload = { ...event, userId: event.userId || this.userId, timestamp: event.timestamp || new Date(), appVersion: process.env.NEXT_PUBLIC_APP_VERSION, }; // Send to analytics service (GA, Mixpanel, etc.) if (typeof window !== 'undefined' && window.gtag) { window.gtag('event', event.name, payload); } // Send to custom analytics if (process.env.NEXT_PUBLIC_ANALYTICS_API) { fetch(process.env.NEXT_PUBLIC_ANALYTICS_API, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload), keepalive: true, }).catch((error) => { logger.error('Failed to send analytics:', error); }); } } catch (error) { logger.error('Analytics error:', error); } } // Predefined events pageView(pageName: string, properties?: Record) { this.trackEvent({ name: 'page_view', properties: { page: pageName, ...properties }, }); } userAction(action: string, properties?: Record) { this.trackEvent({ name: 'user_action', properties: { action, ...properties }, }); } error(error: Error, properties?: Record) { this.trackEvent({ name: 'error', properties: { message: error.message, stack: error.stack, ...properties, }, }); } performance(metric: string, value: number, properties?: Record) { this.trackEvent({ name: 'performance', properties: { metric, value, ...properties }, }); } } export const analytics = new AnalyticsService(); ``` --- ## 🎯 Xulosa ### Senior Team Lead Checklist | Aspekt | Check | |--------|-------| | **Architecture** | ✅ Monorepo with Nx/Turborepo | | **State Management** | ✅ Query + Zustand + React Hook Form | | **Performance** | ✅ Code splitting, memoization, virtualization | | **Testing** | ✅ Unit + Integration + E2E | | **CI/CD** | ✅ Automated pipeline with quality gates | | **Security** | ✅ CSP, headers, authentication | | **Monitoring** | ✅ Performance + Error + Analytics | | **Documentation** | ✅ API docs + Storybook + README | | **Team Practices** | ✅ Code review + Standards + Guidelines | ### Tech Stack Recommendation ``` Framework: Next.js 14 (App Router) Language: TypeScript 5+ State: TanStack Query + Zustand Forms: React Hook Form + Zod UI: Tailwind CSS + Radix UI Testing: Jest + React Testing Library + Playwright CI/CD: GitHub Actions + Vercel Monitoring: Sentry + DataDog Analytics: Google Analytics + Mixpanel ``` --- ## 📌 Key Takeaways 1. **Think Architecture First** — Scalability and maintainability from day one 2. **Choose the Right Tools** — Not every project needs a monorepo 3. **Automate Everything** — CI/CD, testing, code quality 4. **Measure Everything** — Performance, errors, user behavior 5. **Document Everything** — Code, decisions, processes 6. **Lead by Example** — Write quality code and mentor your team 7. **Continuous Learning** — Stay up to date with ecosystem changes 8. **Balance Perfect and Pragmatic** — Good enough is better than perfect --- 🔗 *Ushbu qo‘llanmani do‘stlaringiz bilan ulashing va React mahoratingizni oshiring!* #React #NextJS #TypeScript #Frontend #Architecture #SeniorDeveloper #TechLead #WebDevelopment

⚛️ React: Senior va Team Lead Darajasida Professional Frontend Arhitektura