Senior Frontend Agent Skill

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.

1k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

1856

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/composio-community/awesome-claude-plugins --skill senior-frontend

The instruction itself

18 sections, as written by the author

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

| Option | Description |

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

| --template nextjs | Next.js 14+ with App Router and Server Components |

| --template react | React + Vite with TypeScript |

| --features auth | Add NextAuth.js authentication |

| --features api | Add React Query + API client |

| --features forms | Add React Hook Form + Zod validation |

| --features testing | Add 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

| Option | Description |

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

| --type client | Client component with 'use client' (default) |

| --type server | Async server component |

| --type hook | Custom React hook |

| --with-test | Include test file |

| --with-story | Include Storybook story |

Bundle Analysis

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

Heavy Dependencies to Replace

| Package | Size | Alternative |

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

| moment | 290KB | date-fns (12KB) or dayjs (2KB) |

| lodash | 71KB | lodash-es with tree-shaking |

| axios | 14KB | Native fetch or ky (3KB) |

| jquery | 87KB | Native DOM APIs |

| @mui/material | Large | shadcn/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

Semantic HTML: Use proper elements (<button>, <nav>, <main>)
Keyboard Navigation: All interactive elements focusable
ARIA Labels: Provide labels for icons and complex widgets
Color Contrast: Minimum 4.5:1 for normal text
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>;
}

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How to use it

Copy the folder

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

Check the name does not clash

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