Cursor
ui
React Error Boundary Missing After Cleanup
After Cursor cleaned up React components, error boundaries were removed. When a component throws an error, the entire application crashes instead of showing a graceful error message.
Error handling is now missing from critical parts of the app.
Error Messages You Might See
Error: Uncaught ReferenceError
White screen of death
Application crashed
Uncaught error
Common Causes
- Error boundary component deleted during cleanup
- Error boundary not wrapping important sections
- Error boundary componentDidCatch removed
- No fallback UI specified in error boundary
- Only class components can be error boundaries (functional hooks not yet)
How to Fix It
Create class Error Boundary: componentDidCatch(error, info) { this.setState({hasError: true}); }. Wrap sections: <ErrorBoundary><App /></ErrorBoundary>. Show fallback: this.state.hasError ? <Error /> : children. Log errors to service.
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Get HelpFrequently Asked Questions
What can error boundaries catch?
Rendering errors, lifecycle errors. NOT event handlers or async code. Use try/catch for those.
How do I test error boundaries?
Create test component that throws. Wrap in error boundary. Verify fallback UI renders.