# TypeScript Conventions## Code Style- Use 2-space indentation- Prefer `const` over `let`- Always use explicit return types for functions- Use named exports instead of default exports## Testing- Write unit tests for all utility functions- Use Vitest as the testing framework- Aim for 80%+ code coverage## Dependencies- Prefer native TypeScript features over external libraries- Use Zod for runtime type validation- Use date-fns for date manipulation
# API Design Standards## REST Conventions- Use plural nouns for endpoints (`/users`, not `/user`)- Use HTTP methods semantically (GET, POST, PUT, DELETE)- Return appropriate status codes## Response Format\`\`\`typescript{ data: T, error?: string, metadata?: { page: number, total: number }}\`\`\`## Error Handling- Always return error messages in `error` field- Use 4xx for client errors, 5xx for server errors- Include request ID in error responses
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# Testing Requirements## Test Organization- Place tests next to source files (`Button.test.tsx`)- Use `describe` blocks to group related tests- Write descriptive test names## Coverage Requirements- Unit tests for all utility functions- Integration tests for API endpoints- E2E tests for critical user flows- Minimum 80% coverage for new code## Mocking Strategy- Mock external API calls- Use test fixtures for complex data- Prefer dependency injection for testability
