Modern React: Suspense and Error Boundaries
Harry
· 22 Sep 2026
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Code Splitting
Lazy-load routes and heavy components inside Suspense with a loading fallback.
Error Boundaries
Class-only components catching render errors; show fallback UI with retry and log to a service.
Concurrent Helpers
useTransition and useDeferredValue keep inputs responsive during heavy list updates.
Key Points
- Split by route first, then heavy widgets.
- Align Server Component APIs to your React version.
- Guard every lazy route with a boundary.