Answer
React flushes updates based on event boundaries, transitions, microtasks, and scheduler priorities.
Quick Answer
React flushes pending updates when: an event handler completes (automatic batching), startTransition work completes, the Scheduler decides the task queue should flush, or you manually call flushSync. React 18 batches aggressively — it defers flushing to maximize batching, only flushing when it must produce visible output.
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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