Most effects will work without any changes, but some effects assume they are only mounted or destroyed once. This feature will give React better performance out-of-the-box, but requires components to be resilient to effects being mounted and destroyed multiple times. To do this, React would unmount and remount trees using the same component state as before. For example, when a user tabs away from a screen and back, React should be able to immediately show the previous screen. In the future, we’d like to add a feature that allows React to add and remove sections of the UI while preserving state. React 18 also introduces new APIs for concurrent rendering such as startTransition, useDeferredValue and useId, which we share more about in the release post. Current wifi explorer version upgrade#For more information, see the Library Upgrade Guide for. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. This hook will run after the DOM is mutated, but before layout effects read the new layout. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this.
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