Sumeet Paul· 2 min readState update after route transition
A component starts asynchronous work and then a route transition occurs before the work completes. When the async task resolves, it updates state that no longer matches the active route.
Blog · Frontend Lab
Frontend edge cases,
solved in the open
A collection of real-world frontend edge cases, systems engineering and architectural patterns, bridging the gap between feature implementation and scalable architecture.
6 articles
- Sumeet Paul· 2 min read
- Sumeet Paul· 2 min read
Optimistic UI rollback failure
An optimistic UI update immediately reflects a user action before the server confirms success. If the request fails or multiple toggles occur quickly, the UI can drift away from actual server state.
- Sumeet Paul· 2 min read
Double submit caused by UI state lag
A submit button is disabled only after state updates to 'loading'. Under rapid user interaction, multiple clicks can occur before the UI visually reflects the disabled state.
- Sumeet Paul· 2 min read
Stale closure in click outside listener
Event listeners defined inside effects capture state from the render during which they were created. If the listener is attached once and depends on state that later changes, it may continue operating on outdated values.
- Sumeet Paul· 2 min read
State update after unmount during navigation
When a component starts asynchronous work and the user navigates away before it resolves, the async callback may still attempt to update state. At that point, the component no longer exists in the UI tree.
- Sumeet Paul· 2 min read
Async race condition in search results
Under rapid input changes and slow network conditions, multiple search requests can remain in flight at the same time. When responses resolve out of order, older results may overwrite newer state, causing the UI to display incorrect data.