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senior-frontend

Frontend development skill for React, Next.js, TypeScript, and Tailwind CSS applications. Use when building React components, optimizing Next.js performance, analyzing bundle sizes, scaffolding frontend projects, implementing accessibility, or reviewing frontend code quality.

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SKILL.md
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Senior Frontend

Frontend development patterns, performance optimization, and automation tools for React/Next.js applications.

Project Scaffolding

Generate a new Next.js or React project with TypeScript, Tailwind CSS, and best practice configurations.

Scaffolder Options

OptionDescription
--template nextjsNext.js 14+ with App Router and Server Components
--template reactReact + Vite with TypeScript
--features authAdd NextAuth.js authentication
--features apiAdd React Query + API client
--features formsAdd React Hook Form + Zod validation
--features testingAdd Vitest + Testing Library

Generated Structure (Next.js)

my-app/
├── app/
│   ├── layout.tsx        # Root layout with fonts
│   ├── page.tsx          # Home page
│   ├── globals.css       # Tailwind + CSS variables
│   └── api/health/route.ts
├── components/
│   ├── ui/               # Button, Input, Card
│   └── layout/           # Header, Footer, Sidebar
├── hooks/                # useDebounce, useLocalStorage
├── lib/                  # utils (cn), constants
├── types/                # TypeScript interfaces
├── tailwind.config.ts
├── next.config.js
└── package.json

Component Generation

Generate React components with TypeScript, tests, and Storybook stories.

Generator Options

OptionDescription
--type clientClient component with 'use client' (default)
--type serverAsync server component
--type hookCustom React hook
--with-testInclude test file
--with-storyInclude Storybook story

Bundle Analysis

Analyze package.json and project structure for bundle optimization opportunities.

Heavy Dependencies to Replace

PackageSizeAlternative
moment290KBdate-fns (12KB) or dayjs (2KB)
lodash71KBlodash-es with tree-shaking
axios14KBNative fetch or ky (3KB)
jquery87KBNative DOM APIs
@mui/materialLargeshadcn/ui or Radix UI

React Patterns

Compound Components

const Tabs = ({ children }) => {
  const [active, setActive] = useState(0);
  return (
    <TabsContext.Provider value={{ active, setActive }}>
      {children}
    </TabsContext.Provider>
  );
};

Tabs.List = TabList;
Tabs.Panel = TabPanel;

Custom Hooks

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

  useEffect(() => {
    const timer = setTimeout(() => setDebouncedValue(value), delay);
    return () => clearTimeout(timer);
  }, [value, delay]);

  return debouncedValue;
}

Next.js Optimization

Server vs Client Components

Use Server Components by default. Add 'use client' only when you need:

  • Event handlers (onClick, onChange)
  • State (useState, useReducer)
  • Effects (useEffect)
  • Browser APIs

Image Optimization

import Image from 'next/image';

// Above the fold - load immediately
<Image
  src="/hero.jpg"
  alt="Hero"
  width={1200}
  height={600}
  priority
/>

// Responsive image with fill
<div className="relative aspect-video">
  <Image
    src="/product.jpg"
    alt="Product"
    fill
    sizes="(max-width: 768px) 100vw, 50vw"
    className="object-cover"
  />
</div>

Accessibility Checklist

  1. Semantic HTML: Use proper elements (<button>, <nav>, <main>)
  2. Keyboard Navigation: All interactive elements focusable
  3. ARIA Labels: Provide labels for icons and complex widgets
  4. Color Contrast: Minimum 4.5:1 for normal text
  5. Focus Indicators: Visible focus states
// Accessible button
<button
  type="button"
  aria-label="Close dialog"
  onClick={onClose}
  className="focus-visible:ring-2 focus-visible:ring-blue-500"
>
  <XIcon aria-hidden="true" />
</button>

Quick Reference

Tailwind CSS Utilities

import { cn } from '@/lib/utils';

<button className={cn(
  'px-4 py-2 rounded',
  variant === 'primary' && 'bg-blue-500 text-white',
  disabled && 'opacity-50 cursor-not-allowed'
)} />

TypeScript Patterns

// Props with children
interface CardProps {
  className?: string;
  children: React.ReactNode;
}

// Generic component
interface ListProps<T> {
  items: T[];
  renderItem: (item: T) => React.ReactNode;
}

function List<T>({ items, renderItem }: ListProps<T>) {
  return <ul>{items.map(renderItem)}</ul>;
}
Repository
composio-community/awesome-claude-plugins
Path

senior-frontend/skills/senior-frontend/SKILL.md

Commit

e521f7a

Last updated
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