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React·Advanced·Coding·1 min read

What happens when already visible content suspends during an update?

Short interview answer

React may show the nearest fallback unless the update is marked non-urgent, for example with a transition, allowing current content to remain while new content prepares. The exact experience depends on boundary and cache behavior.

Example

JSX
const [isPending, startTransition] = useTransition();startTransition(() => setQuery(next)); // keep old results visible,                                       // isPending drives a subtle spinner

Key takeaway

Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.

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