This component declares some effects to be run on mount and unmount. Normally these effects would only be run once (after the component is initially mounted) and the cleanup functions would be run once (after the component is unmounted). In React 18 Strict Mode, the following will happen: React renders the component. React mounts the component Layout effect setup code runs. Effect setup code runs.
Overview In React 18 we’re introducing a new API that helps keep your app responsive even during large screen updates. This new API lets you substantially improve user interactions by marking specific updates as “transitions”. React will let you provide visual feedback during a state transition and keep the browser responsive while a transition is happening. Real world example: adding startTransit
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