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Frontend Quality Checks
frontend-quality
Runs frontend quality checks including TypeScript, ESLint, and tests. Use before commits, PRs, or when the user says "check frontend", "run frontend tests", "lint frontend".
SKILL.md
Full skill instructions
Frontend Quality Checks
Runs TypeScript type checking, ESLint, and tests for the frontend.
Quick Check
cd front && pnpm type-check && pnpm lint
1. TypeScript Type Check
cd front && pnpm type-check
Checks all TypeScript files without emitting output.
Common Type Errors
Missing null check in page:
// Error: Build fails
export default function Page() {
const { user } = useUser();
return <Content userId={user.id} />; // user might be undefined!
}
// Fix: Add null check
export default function Page() {
const { user } = useUser();
if (!user) return null; // Required!
return <Content userId={user.id} />;
}
API type mismatch:
# Regenerate types from backend
pnpm run generate:api
2. ESLint
Check:
cd front && pnpm lint
Auto-fix:
cd front && pnpm lint:fix
Common Lint Issues
Unused imports: Auto-fixed by lint:fix
Missing dependencies in useEffect:
// Warning: Missing dependency
useEffect(() => {
fetchData(userId);
}, []); // userId missing
// Fix: Add all dependencies
useEffect(() => {
fetchData(userId);
}, [userId]);
3. Tests (Vitest)
All tests:
cd front && pnpm test
Watch mode:
cd front && pnpm test:watch
Specific file:
cd front && pnpm test src/lib/utils.test.ts
4. Build Check
Full production build (catches more errors):
cd front && pnpm build
Common Build Errors
Dynamic import issues:
- Ensure client components have
'use client'directive - Check for server-only code in client components
Environment variables:
NEXT_PUBLIC_*for client-side- Non-prefixed for server-side only
Pre-commit Checklist
cd front
# 1. Type check
pnpm type-check
# 2. Lint
pnpm lint
# 3. Run tests
pnpm test
# 4. (Optional) Full build
pnpm build
Configuration Files
| File | Purpose |
|---|---|
tsconfig.json | TypeScript configuration |
eslint.config.mjs | ESLint rules |
vitest.config.ts | Test configuration |
next.config.ts | Next.js configuration |
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