Answer
React checks scheduler signals; shouldYield() pauses reconciliation to let high-priority tasks run.
Quick Answer
React's scheduler uses postMessage to break work into tasks. Each task processes fibers until the frame budget (~5ms) is exhausted, then yields. A high-priority interrupt (user input) is registered in the scheduler queue with a higher priority. On the next scheduler cycle, it runs the high-priority task first before resuming list diffing.
S
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