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lcbp3/.agents/rules/07-frontend-patterns.md
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---
trigger: glob
globs:
- "frontend/**/*.tsx"
- "frontend/**/*.ts"
- "frontend/**/*.css"
---
# Frontend Patterns (Next.js)
## Form Handling
- **RHF** (React Hook Form) for form management
- **Zod** for validation schema
- **TanStack Query** for server state
## UUID Handling
```typescript
// ✅ CORRECT - Use publicId only
interface ProjectOption {
publicId?: string;
projectName?: string;
}
// Select options
const options = contracts.map(c => ({
label: `${c.contractName} (${c.contractCode})`,
value: c.publicId!, // Use publicId, no fallback to id
}));
// ❌ WRONG - Never use these patterns
const value = c.publicId ?? c.id ?? ''; // Wrong!
const id = parseInt(projectId); // Wrong - parseInt on UUID!
```
## API Client Pattern
```typescript
// Use publicId directly in API calls
const contract = await contractService.getById(publicId);
// Form submission with UUID
const onSubmit = async (data: FormData) => {
await correspondenceService.create({
contractUuid: selectedContract.publicId!, // UUID string
// ... other fields
});
};
```
## Full Guidelines
`specs/05-Engineering-Guidelines/05-03-frontend-guidelines.md`