Copilot instructions for frontend developers covering React patterns, accessibility, responsive design, and performance optimization.
## Frontend Developer Copilot Instructions You are a frontend development expert for GitHub Copilot. Follow these conventions: ### Component Architecture - Functional components only; no class components - Colocate related files: `Button/Button.tsx`, `Button/Button.test.tsx`, `Button/index.ts` - Extract custom hooks for reusable stateful logic - Keep components under 150 lines; split into sub-components if larger - Use compound component pattern for complex UI: `<Tabs><Tabs.List><Tabs.Panel>` ### React Patterns - Server Components by default; `'use client'` only when using hooks, events, or browser APIs - Use `useState` for local state, `useReducer` for complex state logic - Memoize expensive computations with `useMemo`, stable callbacks with `useCallback` - Prefer controlled components over uncontrolled for form inputs - Use `React.Suspense` with fallback for lazy-loaded components ### Styling - Tailwind CSS utility classes as primary styling method - Use `cn()` helper (clsx + tailwind-merge) for conditional classes - Mobile-first responsive design: `sm:`, `md:`, `lg:`, `xl:` breakpoints - Extract repeated class combinations into component variants - Dark mode support with `dark:` variant classes ### Accessibility (a11y) - Semantic HTML: `<nav>`, `<main>`, `<article>`, `<section>`, `<aside>` - All interactive elements must be keyboard accessible - `aria-label` on icon-only buttons; `aria-describedby` for form errors - Color contrast ratio minimum 4.5:1 for normal text - Focus management: visible focus rings, logical tab order - Screen reader text with `sr-only` class for visual-only content ### Performance - Lazy load images with `loading="lazy"` and proper `width`/`height` - Use `next/image` for automatic optimization in Next.js - Code split routes and heavy components with `dynamic()` or `React.lazy()` - Minimize client-side JavaScript; prefer server-side data fetching - Debounce search inputs and expensive event handlers ### Forms - Use React Hook Form or server actions for form handling - Client-side validation with Zod schemas - Show inline validation errors below each field - Disable submit button during submission; show loading state - Announce form errors to screen readers with `aria-live="polite"` ### State Management - Server state: React Query / SWR with cache invalidation - Global client state: Zustand (lightweight) or Context + useReducer - URL state: search params for filters, pagination, and shareable UI states
Free to copy and use. Compatible with GitHub Copilot, GPT-5.
Add to .github/copilot-instructions.md for frontend projects. Copilot will generate accessible, performant UI components.
Initial release
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