Answer
React ensures atomic snapshot reads and compares server/client snapshots, preventing tearing during concurrent renders.
Quick Answer
useSyncExternalStore takes a subscribe function and a getSnapshot function. On render, React calls getSnapshot and renders with that value. It also registers a listener via subscribe. If the store changes during a concurrent render, React compares the new snapshot — if different from the render-time snapshot, it re-renders synchronously to prevent tearing.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ