How does React's scheduler prioritize updates with Fiber?
Tests cooperative scheduling. Cover Fiber's incremental units, the Scheduler's time-slicing loop, and Lanes where SyncLane and InputContinuousLane outrank DefaultLane. Red flag: claiming React uses a separate thread or that batching alone handles priority.
This tests deep understanding of React's concurrent engine and cooperative scheduling. A strong answer explains how Fiber breaks rendering into incremental units the Scheduler can interrupt, then details the Lanes priority model: SyncLane for clicks, InputContinuousLane for typing, DefaultLane for data fetches, and IdleLane for background tasks. Mention the Scheduler's time-slicing loop yields control to the browser to prevent blocking. Red flag: confusing lanes with simple setState batching or claiming concurrent mode requires Web Workers.
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- #react
- #fiber
- #scheduler
- #concurrent-rendering
- #performance
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