React Vite Skill Skill | Agent Skills

React Vite Skill

Provides comprehensive React 18+ development with Vite bundler, TypeScript integration, and modern frontend patterns.

When to Use This Skill

Activate this skill when working with:

React 18+ applications with Vite
TypeScript component development
React hooks and custom hooks
State management (Context, Zustand, React Query)
Component composition and patterns
Vite configuration and optimization
Build optimization and deployment

Quick Reference

Project Setup

# Create new Vite + React + TypeScript project
npm create vite@latest my-app -- --template react-ts
cd my-app
npm install

# Install common dependencies
npm install @tanstack/react-query zustand react-hook-form zod
npm install -D @types/node

# Development
npm run dev

# Build
npm run build
npm run preview

# Lint
npm run lint

Project Structure

src/
├── main.tsx              # Application entry point
├── App.tsx              # Root component
├── vite-env.d.ts        # Vite TypeScript definitions
├── components/          # Reusable components
│   ├── ui/             # Base UI components
│   │   ├── Button.tsx
│   │   ├── Card.tsx
│   │   └── Input.tsx
│   └── features/       # Feature-specific components
│       ├── UserList.tsx
│       └── Dashboard.tsx
├── hooks/              # Custom hooks
│   ├── useAuth.ts
│   ├── useApi.ts
│   └── useLocalStorage.ts
├── stores/            # State management
│   ├── authStore.ts
│   └── userStore.ts
├── services/          # API and external services
│   ├── api.ts
│   └── auth.ts
├── types/            # TypeScript types
│   ├── index.ts
│   └── api.ts
├── utils/           # Utility functions
│   └── helpers.ts
└── styles/         # Global styles
    └── index.css

Vite Configuration

// vite.config.ts
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import path from 'path'

export default defineConfig({
  plugins: [react()],

  // Path aliases
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
      '@components': path.resolve(__dirname, './src/components'),
      '@hooks': path.resolve(__dirname, './src/hooks'),
      '@stores': path.resolve(__dirname, './src/stores'),
      '@types': path.resolve(__dirname, './src/types'),
      '@utils': path.resolve(__dirname, './src/utils'),
    },
  },

  // Server configuration
  server: {
    port: 3000,
    proxy: {
      '/api': {
        target: 'http://localhost:8000',
        changeOrigin: true,
      },
    },
  },

  // Build optimization
  build: {
    rollupOptions: {
      output: {
        manualChunks: {
          vendor: ['react', 'react-dom'],
          utils: ['@tanstack/react-query', 'zustand'],
        },
      },
    },
    sourcemap: true,
    minify: 'terser',
  },
})

TypeScript Configuration

// tsconfig.json
{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "skipLibCheck": true,

    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",

    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,

    "baseUrl": ".",
    "paths": {
      "@/*": ["./src/*"],
      "@components/*": ["./src/components/*"],
      "@hooks/*": ["./src/hooks/*"],
      "@stores/*": ["./src/stores/*"],
      "@types/*": ["./src/types/*"],
      "@utils/*": ["./src/utils/*"]
    }
  },
  "include": ["src"],
  "references": [{ "path": "./tsconfig.node.json" }]
}

Component Patterns

Functional Component with TypeScript

import { FC, ReactNode } from 'react'

interface ButtonProps {
  children: ReactNode
  variant?: 'primary' | 'secondary' | 'danger'
  size?: 'sm' | 'md' | 'lg'
  disabled?: boolean
  onClick?: () => void
}

export const Button: FC<ButtonProps> = ({
  children,
  variant = 'primary',
  size = 'md',
  disabled = false,
  onClick,
}) => {
  return (
    <button
      className={`btn btn-${variant} btn-${size}`}
      disabled={disabled}
      onClick={onClick}
    >
      {children}
    </button>
  )
}

Component with Generic Types

interface ListProps<T> {
  items: T[]
  renderItem: (item: T) => ReactNode
  keyExtractor: (item: T) => string | number
}

export function List<T>({ items, renderItem, keyExtractor }: ListProps<T>) {
  return (
    <ul>
      {items.map((item) => (
        <li key={keyExtractor(item)}>{renderItem(item)}</li>
      ))}
    </ul>
  )
}

// Usage
<List
  items={users}
  renderItem={(user) => <UserCard user={user} />}
  keyExtractor={(user) => user.id}
/>

Custom Hooks

useLocalStorage Hook

import { useState, useEffect } from 'react'

export function useLocalStorage<T>(
  key: string,
  initialValue: T
): [T, (value: T) => void] {
  const [storedValue, setStoredValue] = useState<T>(() => {
    try {
      const item = window.localStorage.getItem(key)
      return item ? JSON.parse(item) : initialValue
    } catch (error) {
      console.error(error)
      return initialValue
    }
  })

  const setValue = (value: T) => {
    try {
      setStoredValue(value)
      window.localStorage.setItem(key, JSON.stringify(value))
    } catch (error) {
      console.error(error)
    }
  }

  return [storedValue, setValue]
}

useDebounce Hook

import { useState, useEffect } from 'react'

export function useDebounce<T>(value: T, delay: number = 500): T {
  const [debouncedValue, setDebouncedValue] = useState<T>(value)

  useEffect(() => {
    const handler = setTimeout(() => {
      setDebouncedValue(value)
    }, delay)

    return () => {
      clearTimeout(handler)
    }
  }, [value, delay])

  return debouncedValue
}

useAsync Hook

import { useState, useEffect, useCallback } from 'react'

interface AsyncState<T> {
  data: T | null
  loading: boolean
  error: Error | null
}

export function useAsync<T>(
  asyncFunction: () => Promise<T>,
  immediate = true
) {
  const [state, setState] = useState<AsyncState<T>>({
    data: null,
    loading: immediate,
    error: null,
  })

  const execute = useCallback(async () => {
    setState({ data: null, loading: true, error: null })
    try {
      const response = await asyncFunction()
      setState({ data: response, loading: false, error: null })
    } catch (error) {
      setState({ data: null, loading: false, error: error as Error })
    }
  }, [asyncFunction])

  useEffect(() => {
    if (immediate) {
      execute()
    }
  }, [execute, immediate])

  return { ...state, execute }
}

State Management with Zustand

// stores/authStore.ts
import { create } from 'zustand'
import { persist } from 'zustand/middleware'

interface User {
  id: string
  email: string
  name: string
}

interface AuthState {
  user: User | null
  token: string | null
  isAuthenticated: boolean
  login: (user: User, token: string) => void
  logout: () => void
}

export const useAuthStore = create<AuthState>()(
  persist(
    (set) => ({
      user: null,
      token: null,
      isAuthenticated: false,

      login: (user, token) =>
        set({ user, token, isAuthenticated: true }),

      logout: () =>
        set({ user: null, token: null, isAuthenticated: false }),
    }),
    {
      name: 'auth-storage',
    }
  )
)

// Usage in component
function Profile() {
  const { user, logout } = useAuthStore()

  return (
    <div>
      <h1>{user?.name}</h1>
      <button onClick={logout}>Logout</button>
    </div>
  )
}

Data Fetching with React Query

// services/api.ts
import axios from 'axios'

const api = axios.create({
  baseURL: import.meta.env.VITE_API_URL || '/api',
})

api.interceptors.request.use((config) => {
  const token = useAuthStore.getState().token
  if (token) {
    config.headers.Authorization = `Bearer ${token}`
  }
  return config
})

export interface User {
  id: number
  name: string
  email: string
}

export const userApi = {
  getAll: () => api.get<User[]>('/users').then((res) => res.data),
  getById: (id: number) => api.get<User>(`/users/${id}`).then((res) => res.data),
  create: (data: Omit<User, 'id'>) => api.post<User>('/users', data).then((res) => res.data),
  update: (id: number, data: Partial<User>) => api.patch<User>(`/users/${id}`, data).then((res) => res.data),
  delete: (id: number) => api.delete(`/users/${id}`),
}

// hooks/useUsers.ts
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { userApi, User } from '@/services/api'

export function useUsers() {
  return useQuery({
    queryKey: ['users'],
    queryFn: userApi.getAll,
    staleTime: 5 * 60 * 1000, // 5 minutes
  })
}

export function useUser(id: number) {
  return useQuery({
    queryKey: ['users', id],
    queryFn: () => userApi.getById(id),
    enabled: !!id,
  })
}

export function useCreateUser() {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: userApi.create,
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['users'] })
    },
  })
}

export function useUpdateUser() {
  const queryClient = useQueryClient()

  return useMutation({
    mutationFn: ({ id, data }: { id: number; data: Partial<User> }) =>
      userApi.update(id, data),
    onSuccess: (_, variables) => {
      queryClient.invalidateQueries({ queryKey: ['users'] })
      queryClient.invalidateQueries({ queryKey: ['users', variables.id] })
    },
  })
}

Form Handling with React Hook Form

import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { z } from 'zod'

const userSchema = z.object({
  name: z.string().min(1, 'Name is required'),
  email: z.string().email('Invalid email address'),
  age: z.number().min(18, 'Must be at least 18'),
})

type UserFormData = z.infer<typeof userSchema>

export function UserForm() {
  const {
    register,
    handleSubmit,
    formState: { errors, isSubmitting },
    reset,
  } = useForm<UserFormData>({
    resolver: zodResolver(userSchema),
    defaultValues: {
      name: '',
      email: '',
      age: 18,
    },
  })

  const { mutate: createUser } = useCreateUser()

  const onSubmit = (data: UserFormData) => {
    createUser(data, {
      onSuccess: () => {
        reset()
      },
    })
  }

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <div>
        <label htmlFor="name">Name</label>
        <input {...register('name')} id="name" />
        {errors.name && <span>{errors.name.message}</span>}
      </div>

      <div>
        <label htmlFor="email">Email</label>
        <input {...register('email')} type="email" id="email" />
        {errors.email && <span>{errors.email.message}</span>}
      </div>

      <div>
        <label htmlFor="age">Age</label>
        <input {...register('age', { valueAsNumber: true })} type="number" id="age" />
        {errors.age && <span>{errors.age.message}</span>}
      </div>

      <button type="submit" disabled={isSubmitting}>
        {isSubmitting ? 'Creating...' : 'Create User'}
      </button>
    </form>
  )
}

Performance Optimization

Code Splitting with Lazy Loading

import { lazy, Suspense } from 'react'
import { BrowserRouter, Routes, Route } from 'react-router-dom'

const Dashboard = lazy(() => import('./pages/Dashboard'))
const Users = lazy(() => import('./pages/Users'))
const Settings = lazy(() => import('./pages/Settings'))

function App() {
  return (
    <BrowserRouter>
      <Suspense fallback={<div>Loading...</div>}>
        <Routes>
          <Route path="/" element={<Dashboard />} />
          <Route path="/users" element={<Users />} />
          <Route path="/settings" element={<Settings />} />
        </Routes>
      </Suspense>
    </BrowserRouter>
  )
}

Memoization

import { memo, useMemo, useCallback } from 'react'

interface UserListProps {
  users: User[]
  onUserClick: (id: number) => void
}

export const UserList = memo<UserListProps>(({ users, onUserClick }) => {
  const sortedUsers = useMemo(
    () => [...users].sort((a, b) => a.name.localeCompare(b.name)),
    [users]
  )

  const handleClick = useCallback(
    (id: number) => {
      console.log('Clicked user:', id)
      onUserClick(id)
    },
    [onUserClick]
  )

  return (
    <ul>
      {sortedUsers.map((user) => (
        <li key={user.id} onClick={() => handleClick(user.id)}>
          {user.name}
        </li>
      ))}
    </ul>
  )
})

Environment Variables

# .env
VITE_API_URL=http://localhost:8000/api
VITE_APP_NAME=Zenith
VITE_ENABLE_ANALYTICS=true

// Access in code
const apiUrl = import.meta.env.VITE_API_URL
const appName = import.meta.env.VITE_APP_NAME
const isDev = import.meta.env.DEV
const isProd = import.meta.env.PROD

Testing Setup

// vitest.config.ts
import { defineConfig } from 'vitest/config'
import react from '@vitejs/plugin-react'
import path from 'path'

export default defineConfig({
  plugins: [react()],
  test: {
    globals: true,
    environment: 'jsdom',
    setupFiles: './src/test/setup.ts',
  },
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
    },
  },
})

// src/test/setup.ts
import { expect, afterEach } from 'vitest'
import { cleanup } from '@testing-library/react'
import * as matchers from '@testing-library/jest-dom/matchers'

expect.extend(matchers)

afterEach(() => {
  cleanup()
})

Best Practices

TypeScript: Use strict mode and avoid any types
Component Structure: Keep components small and focused
Custom Hooks: Extract reusable logic into custom hooks
State Management: Use appropriate tools (Context for simple, Zustand/Redux for complex)
Data Fetching: Use React Query for server state management
Forms: Leverage React Hook Form with Zod validation
Performance: Use memo, useMemo, useCallback judiciously
Code Splitting: Implement lazy loading for routes and heavy components
Error Boundaries: Implement error boundaries for graceful error handling
Accessibility: Use semantic HTML and ARIA attributes

Build and Deployment

# Build for production
npm run build

# Preview production build
npm run preview

# Analyze bundle size
npm run build -- --mode analyze

# Type checking
npx tsc --noEmit

Vite Plugins

# Common Vite plugins
npm install -D vite-plugin-pwa
npm install -D vite-plugin-compression
npm install -D @vitejs/plugin-react-swc  # Faster than default

Agent Skills: React Vite Skill

Install this agent skill to your local

Skill Files

React Vite Skill

When to Use This Skill

Quick Reference

Project Setup

Project Structure

Vite Configuration

TypeScript Configuration

Component Patterns

Functional Component with TypeScript

Component with Generic Types

Custom Hooks

useLocalStorage Hook

useDebounce Hook

useAsync Hook

State Management with Zustand

Data Fetching with React Query

Form Handling with React Hook Form

Performance Optimization

Code Splitting with Lazy Loading

Memoization

Environment Variables

Testing Setup

Best Practices

Build and Deployment

Vite Plugins