Developers Guide

Here is the error I encountered:
[Paste stack trace]

Here is the related documentation:
[Upload or paste docs]

Please help me:
1. Trace the control flow and find the root cause
2. Explain why this error occurs
3. Provide a fix plan and possible side effects

I need to implement a `calculateDiscount(price, userType)` function.

First help me write test cases covering:
- Normal cases (regular user, VIP user)
- Boundary cases (price = 0, negative price, very large amount)
- Exception cases (invalid user type, missing parameters)

Then implement the function and ensure all tests pass.

I need to fix a login bug, but I am not familiar with
this part of the codebase.

Please help me:
1. Find all files related to user login
2. Explain the key steps of the login flow
3. Identify which files handle authentication, session
   management, and error handling
4. Tell me which files need to be modified if I change
   login logic

When implementing this feature:
- Run tests automatically after coding
- Run lint checks for code style
- If tests fail, analyze root cause and fix proactively
- Finally return code that passes all tests

Create a new REST API endpoint:
- Path: POST /api/users/forgot-password
- Accept email in request body
- Generate secure reset token
- Send email with reset link
- Add rate limiting (5 requests per hour per email)
- Write integration tests
- Update API documentation

Review and improve the code quality of src/utils/validation.ts:
1. Add TypeScript types for better type safety
2. Add JSDoc comments for public functions
3. Refactor duplicated validation logic
4. Add unit tests for edge cases
5. Ensure consistent error handling

I need to migrate this React class component to a functional
component with hooks:

[Paste component code]

Requirements:
- Convert to functional component with hooks
- Maintain all existing functionality
- Use modern React patterns
- Add TypeScript types
- Keep the same prop interface