Frontend Patterns Agent Skill

by vibeeval

React, Next.js, TypeScript frontend patterns - component design, state management, performance

1k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

521

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/vibeeval/vibecosystem --skill frontend-patterns

The instruction itself

11 sections, as written by the author

Frontend Patterns

Component Design

Composition over Inheritance

// DOGRU: Composition
function Card({ children, header }: { children: ReactNode; header: ReactNode }) {
  return (
    <div className="card">
      <div className="card-header">{header}</div>
      <div className="card-body">{children}</div>
    </div>
  );
}

// Kullanim
<Card header={<h2>Title</h2>}>
  <p>Content here</p>
</Card>

Container/Presenter Pattern

// Container: Data fetching + logic
function UserListContainer() {
  const { data, isLoading } = useQuery(['users'], fetchUsers);
  if (isLoading) return <Skeleton />;
  return <UserList users={data} />;
}

// Presenter: Pure rendering
function UserList({ users }: { users: User[] }) {
  return (
    <ul>
      {users.map(u => <UserItem key={u.id} user={u} />)}
    </ul>
  );
}

State Management

| Cozum | Ne Zaman | Karmasiklik |

|-------|----------|-------------|

| useState | Local component state | Dusuk |

| useReducer | Complex local state | Orta |

| Context | Theme, auth, locale | Dusuk-Orta |

| Zustand | Global client state | Orta |

| React Query | Server state | Orta |

| URL params | Navigation state | Dusuk |

Performance

// React.memo: Expensive render onleme
const ExpensiveList = React.memo(({ items }: { items: Item[] }) => (
  <ul>{items.map(i => <ListItem key={i.id} item={i} />)}</ul>
));

// useMemo: Expensive hesaplama cache
const filtered = useMemo(
  () => items.filter(i => i.status === status),
  [items, status]
);

// useCallback: Referans stabilitesi
const handleClick = useCallback((id: string) => {
  setSelected(id);
}, []);

Next.js Patterns

| Feature | Ne Zaman |

|---------|----------|

| Server Component | Data fetch, no interactivity |

| Client Component | onClick, useState, useEffect |

| Route Handler | API endpoint |

| Middleware | Auth, redirect, rewrite |

| Streaming | Buyuk data, progressive rendering |

shadcn/ui Best Practices

// Theme config: globals.css'te CSS variable kullan
// shadcn/ui dark mode: class strategy (Tailwind darkMode: 'class')

// Component override: cn() ile extend et, fork etme
import { Button } from '@/components/ui/button'
<Button variant="outline" className={cn('custom-class', className)} />

// Compose, override etme:
function SubmitButton({ children, ...props }: ButtonProps) {
  return <Button type="submit" variant="default" {...props}>{children}</Button>
}

// A11y: shadcn radix tabanli, otomatik ARIA ama kontrol et
// Dark mode: CSS variable'lar otomatik switch eder

Performance Budget

| Metrik | Esik | Olcum |

|--------|------|-------|

| LCP (Largest Contentful Paint) | < 2.5s | Core Web Vital |

| CLS (Cumulative Layout Shift) | < 0.1 | Core Web Vital |

| INP (Interaction to Next Paint) | < 200ms | Core Web Vital |

| FCP (First Contentful Paint) | < 1.8s | Lighthouse |

| TTI (Time to Interactive) | < 3.8s | Lighthouse |

| Total JS bundle | < 200KB gzipped | Build analiz |

React Performance Top 10

React.memo sadece gercekten expensive render'larda
useMemo/useCallback sadece referans stability gerektiginde
Code splitting: React.lazy() + Suspense route bazli
Image optimization: next/image, lazy loading, WebP/AVIF
Virtual scroll: 100+ item listede @tanstack/virtual
Debounce: Arama input'unda 300ms debounce
Skeleton UI: Loading state icin layout shift onleme
Bundle analyze: @next/bundle-analyzer ile kontrol
Prefetch: <Link prefetch> kritik navigation'larda

10. Server Component: Default RSC, client sadece interactive icin

Anti-Patterns

| Anti-Pattern | Dogru Yol |

|-------------|-----------|

| Prop drilling (5+ level) | Context veya state library |

| useEffect for derived state | useMemo kullan |

| Index as key | Unique ID kullan |

| Premature optimization | Profiler ile olc, sonra optimize et |

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How to use it

Copy the folder

Take vibeeval/frontend-patterns from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.