Code Generation Workflows

Stage 1: Types/Interfaces
Stage 2: Core Logic
Stage 3: Integration
Stage 4: Error Handling
Stage 5: Tests

Define TypeScript interfaces for a shopping cart feature.

Requirements:
- Cart contains items with product, quantity, and price
- Support for discount codes
- Track subtotal, tax, and total
- Handle multiple shipping addresses

Output:
1. All necessary interfaces
2. Type unions for states (empty, has-items, checked-out)
3. Utility types if needed

interface CartItem {
  productId: string;
  name: string;
  quantity: number;
  unitPrice: number;
  totalPrice: number;
}

interface DiscountCode {
  code: string;
  type: 'percentage' | 'fixed';
  value: number;
}

interface CartTotals {
  subtotal: number;
  discount: number;
  tax: number;
  shipping: number;
  total: number;
}

type CartState =
  | { status: 'empty' }
  | { status: 'has-items'; items: CartItem[]; totals: CartTotals }
  | { status: 'checked-out'; orderId: string };

Using these types:
[paste types from Stage 1]

Generate the cart calculation functions:
1. calculateItemTotal(item: CartItem): number
2. calculateSubtotal(items: CartItem[]): number
3. applyDiscount(subtotal: number, discount: DiscountCode): number
4. calculateTax(amount: number, taxRate: number): number
5. calculateCartTotals(items: CartItem[], discount?: DiscountCode): CartTotals

Requirements:
- Pure functions, no side effects
- Handle edge cases (empty cart, invalid discount)
- Round to 2 decimal places

Using these types and functions:
[paste types and functions]

Create a React hook useCart that:
- Manages cart state
- Provides addItem, removeItem, updateQuantity
- Applies discount codes
- Persists to localStorage
- Syncs with server on changes

Use this pattern from our codebase:
[paste example hook]

Add error handling to this cart implementation:
[paste code]

Handle:
- Network failures when syncing
- Invalid quantities (negative, non-integer)
- Out-of-stock items
- Expired discount codes
- Concurrent modification conflicts

Use our error handling pattern:
- Custom error classes
- User-friendly error messages
- Error recovery where possible

Generate tests for the cart calculation functions:
[paste functions]

Include:
- Happy path tests
- Edge cases (empty arrays, zero values)
- Error conditions
- Boundary values (max quantities, min prices)

Use Jest with our test patterns:
[paste example test]

Create a skeleton for a REST API file upload service.

Include:
- Express router structure
- Endpoint stubs (no implementation)
- Middleware placeholders
- Error handling structure
- Type definitions

Don't implement the actual logic yet—just the structure.

Here's the skeleton:
[paste skeleton]

Now implement only the upload endpoint with:
- Multer for file handling
- File validation (size, type)
- Storage to local filesystem
- Return file metadata on success

Now implement the download endpoint using the same patterns.
[continue for each section]

// ExistingComponent.tsx
export const UserCard: FC<UserCardProps> = ({ user, onEdit }) => {
  // ... implementation
};

Create a basic search input that:
- Accepts user input
- Calls onSearch prop with value
- Basic styling

Enhance this search input:
[paste v1 code]

Add:
- Debouncing (300ms)
- Loading indicator
- Clear button

Finalize this search input:
[paste v2 code]

Add:
- Keyboard shortcuts (Escape to clear)
- Accessibility (ARIA labels)
- Focus styles
- Placeholder text customization

// How we structure hooks
export const useUsers = (filters: UserFilters) => {
  return useQuery({
    queryKey: ['users', filters],
    queryFn: () => api.getUsers(filters),
    select: (data) => data.users,
  });
};

I need to build a complete comment system.

Instead of generating everything, let's chunk it:

Chunk 1: Database schema and Prisma models
Chunk 2: API endpoints (CRUD)
Chunk 3: React components (list, form, item)
Chunk 4: Real-time updates (WebSocket)

Let's start with Chunk 1. Generate the Prisma schema for comments:
- Supports nested replies (2 levels max)
- Author relationship
- Soft delete
- Timestamps

We've completed:
- [x] Prisma schema (generates Comment, Reply)
- [x] API endpoints (GET, POST, DELETE)

Now generate Chunk 3: React components.

These components should use:
- The types generated from Prisma
- The API endpoints we created
- Our existing component patterns

Generate:
1. CommentList - displays all comments
2. CommentForm - new comment form
3. CommentItem - single comment display
4. ReplyForm - reply to comment form

Review this generated code for type safety:
[paste code]

Check for:
- Any use of 'any' type
- Missing type annotations
- Possible null/undefined issues
- Type assertions that could fail

Does this code follow our project patterns?

Our patterns:
- Error handling: [pattern]
- Naming: [conventions]
- File structure: [structure]

Generated code:
[paste code]

What deviates from our patterns?

Review this generated code for security:
[paste code]

Check for:
- Input validation gaps
- Injection vulnerabilities
- Authentication/authorization issues
- Data exposure risks