scaffolder

Command: /scaffold client-component SearchBar

Generated: components/search-bar/index.tsx

'use client'  // Required for useState (per nextjs.mdc > Components)

import { useState, useCallback } from 'react'
import { useDebounce } from '@/hooks/use-debounce'

// Props interface (per typescript.mdc)
interface SearchBarProps {
  onSearch: (query: string) => void
  placeholder?: string
  debounceMs?: number
}

// Functional component (per react.mdc)
export function SearchBar({
  onSearch,
  placeholder = 'Search...',
  debounceMs = 300,
}: SearchBarProps) {
  // Minimal client state (per nextjs.mdc > State Management)
  const [query, setQuery] = useState('')

  // Debounced callback (per nextjs.mdc > Performance)
  const debouncedSearch = useDebounce(onSearch, debounceMs)

  const handleChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
    const value = e.target.value
    setQuery(value)
    debouncedSearch(value)
  }, [debouncedSearch])

  return (
    <input
      type="search"
      value={query}
      onChange={handleChange}
      placeholder={placeholder}
      className="w-full px-4 py-2 border rounded-lg"  // Tailwind (per tailwind.mdc)
      aria-label={placeholder}  // Accessibility
    />
  )
}

export default SearchBar

Command: /scaffold api users

Generated: app/api/users/route.ts

import { NextRequest, NextResponse } from 'next/server'
import { z } from 'zod'  // Zod for validation (per nextjs.mdc > Forms and Validation)

// Request schema (per typescript.mdc > Type System)
const CreateUserSchema = z.object({
  email: z.string().email(),
  name: z.string().min(2),
})

// Response type (per typescript.mdc)
interface UserResponse {
  id: string
  email: string
  name: string
  createdAt: string
}

// GET handler (per nextjs.mdc > Routing)
export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url)
    const page = parseInt(searchParams.get('page') ?? '1')
    const limit = parseInt(searchParams.get('limit') ?? '10')

    // TODO: Replace with actual database query
    const users: UserResponse[] = []

    return NextResponse.json({
      data: users,
      pagination: { page, limit, total: 0 },
    })
  } catch (error) {
    // Proper error handling (per nextjs.mdc > Data Fetching)
    console.error('Failed to fetch users:', error)
    return NextResponse.json(
      { error: 'Failed to fetch users' },
      { status: 500 }
    )
  }
}

// POST handler with validation
export async function POST(request: NextRequest) {
  try {
    const body = await request.json()

    // Server-side validation (per nextjs.mdc > Forms and Validation)
    const validated = CreateUserSchema.parse(body)

    // TODO: Replace with actual database insert
    const user: UserResponse = {
      id: crypto.randomUUID(),
      ...validated,
      createdAt: new Date().toISOString(),
    }

    return NextResponse.json({ data: user }, { status: 201 })
  } catch (error) {
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: 'Validation failed', details: error.errors },
        { status: 400 }
      )
    }
    console.error('Failed to create user:', error)
    return NextResponse.json(
      { error: 'Failed to create user' },
      { status: 500 }
    )
  }
}

Command: /scaffold fastapi-route users

Generated: app/routers/users.py

"""User management endpoints."""
# Type hints required (per python.mdc)
from typing import Annotated
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, Query, status
from pydantic import BaseModel, EmailStr, Field

# Router with tags (per fastapi.mdc > API Design)
router = APIRouter(prefix="/users", tags=["users"])


# Pydantic models (per fastapi.mdc > Components and Validation)
class UserCreate(BaseModel):
    """Schema for creating a user."""
    email: EmailStr
    name: str = Field(..., min_length=2, max_length=100)


class UserResponse(BaseModel):
    """Schema for user response."""
    id: UUID
    email: EmailStr
    name: str
    created_at: str

    class Config:
        from_attributes = True


class PaginatedResponse(BaseModel):
    """Paginated response wrapper."""
    data: list[UserResponse]
    total: int
    page: int
    limit: int


# Dependency injection (per fastapi.mdc > Dependency Injection)
async def get_db():
    """Database session dependency."""
    # TODO: Replace with actual database session
    yield None


# GET endpoint with pagination (per fastapi.mdc > Performance)
@router.get("", response_model=PaginatedResponse)
async def list_users(
    db: Annotated[None, Depends(get_db)],
    page: Annotated[int, Query(ge=1)] = 1,
    limit: Annotated[int, Query(ge=1, le=100)] = 10,
) -> PaginatedResponse:
    """
    List all users with pagination.

    - **page**: Page number (starting from 1)
    - **limit**: Items per page (max 100)
    """
    # TODO: Replace with actual database query
    users: list[UserResponse] = []
    total = 0

    return PaginatedResponse(data=users, total=total, page=page, limit=limit)


# POST endpoint with validation
@router.post("", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
async def create_user(
    user_data: UserCreate,
    db: Annotated[None, Depends(get_db)],
) -> UserResponse:
    """
    Create a new user.

    - **email**: Valid email address
    - **name**: User's display name (2-100 chars)
    """
    # TODO: Replace with actual database insert
    # Check for existing user, create, return

    raise HTTPException(
        status_code=status.HTTP_501_NOT_IMPLEMENTED,
        detail="Database integration pending",
    )


# GET by ID endpoint
@router.get("/{user_id}", response_model=UserResponse)
async def get_user(
    user_id: UUID,
    db: Annotated[None, Depends(get_db)],
) -> UserResponse:
    """Get a specific user by ID."""
    # TODO: Replace with actual database query
    raise HTTPException(
        status_code=status.HTTP_404_NOT_FOUND,
        detail=f"User {user_id} not found",
    )

Command: /scaffold test components/user-profile

Generated: components/user-profile/__tests__/index.test.tsx

// Test file (per jest-*.mdc / vitest-*.mdc patterns)
import { render, screen, waitFor } from '@testing-library/react'
import { describe, it, expect, vi, beforeEach } from 'vitest'
import { UserProfile } from '../index'

// Mock external dependencies (per testing best practices)
vi.mock('@/lib/api', () => ({
  fetchUser: vi.fn(),
}))

describe('UserProfile', () => {
  // Clear mocks before each test (per clean-code.mdc)
  beforeEach(() => {
    vi.clearAllMocks()
  })

  // Descriptive test names (per testing guidelines)
  it('renders loading skeleton initially', () => {
    render(<UserProfile userId="123" />)

    expect(screen.getByTestId('user-profile-skeleton')).toBeInTheDocument()
  })

  it('displays user information after loading', async () => {
    const mockUser = {
      id: '123',
      name: 'John Doe',
      email: 'john@example.com',
    }

    const { fetchUser } = await import('@/lib/api')
    vi.mocked(fetchUser).mockResolvedValue(mockUser)

    render(<UserProfile userId="123" />)

    await waitFor(() => {
      expect(screen.getByText('John Doe')).toBeInTheDocument()
      expect(screen.getByText('john@example.com')).toBeInTheDocument()
    })
  })

  it('handles error state gracefully', async () => {
    const { fetchUser } = await import('@/lib/api')
    vi.mocked(fetchUser).mockRejectedValue(new Error('Network error'))

    render(<UserProfile userId="123" />)

    await waitFor(() => {
      expect(screen.getByText(/failed to load/i)).toBeInTheDocument()
    })
  })

  // Edge cases (per qa best practices)
  it('shows details when showDetails prop is true', async () => {
    render(<UserProfile userId="123" showDetails />)

    await waitFor(() => {
      expect(screen.getByTestId('user-details-section')).toBeInTheDocument()
    })
  })
})

Command: /scaffold e2e-test user-flow

Generated: cypress/e2e/user-flow.cy.ts

// E2E test (per cypress-e2e-testing-*.mdc)
describe('User Flow', () => {
  // Setup before tests (per cypress best practices)
  beforeEach(() => {
    // Reset state and seed data
    cy.task('db:seed')
    cy.visit('/')
  })

  // Critical user flow (per cypress-e2e-testing guidelines)
  it('allows user to sign up, login, and view profile', () => {
    // Use data-testid selectors (per cypress best practices)
    cy.get('[data-testid="signup-link"]').click()

    // Fill signup form
    cy.get('[data-testid="email-input"]').type('test@example.com')
    cy.get('[data-testid="password-input"]').type('SecurePass123!')
    cy.get('[data-testid="name-input"]').type('Test User')
    cy.get('[data-testid="signup-submit"]').click()

    // Verify redirect to dashboard
    cy.url().should('include', '/dashboard')

    // Navigate to profile
    cy.get('[data-testid="profile-link"]').click()

    // Verify profile data
    cy.get('[data-testid="profile-name"]').should('contain', 'Test User')
    cy.get('[data-testid="profile-email"]').should('contain', 'test@example.com')
  })

  // API mocking example (per cypress-api-testing guidelines)
  it('handles API errors gracefully', () => {
    // Mock API failure
    cy.intercept('GET', '/api/users/*', {
      statusCode: 500,
      body: { error: 'Internal server error' },
    }).as('getUserError')

    cy.visit('/profile')

    // Wait for mocked request
    cy.wait('@getUserError')

    // Verify error handling
    cy.get('[data-testid="error-message"]')
      .should('be.visible')
      .and('contain', 'Failed to load profile')

    // Verify retry option
    cy.get('[data-testid="retry-button"]').should('be.visible')
  })
})