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Although useEffect is deferred until after the browser has painted, it’s guaranteed to fire before any new renders. React will always flush a previous render’s effects before starting a new update.
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React will always flush a previous render’s effects before starting a new update.»? Что значит «сбрасывает»?АЗ
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React update 1: render virtual DOM, schedule effects, update DOM
Call useLayoutEffect
Update state, schedule re-render
Call useEffect
React update 2
Call useLayoutEffect from update 2
React releases control, browser paints the new DOM
Call useEffect from update 2