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1. This custom React hook, useKeyboardO... This custom React hook, useKeyboardObserver, allows you to detect whether the software keyboard (e.g., on mobile devices) is open or closed within your React application. It monitors changes in the visual viewport height and infers keyboard visibility based on these changes.

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   /* eslint-disable no-param-reassign */

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   import { useCallback, useEffect, useRef, useState } from 'react';

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   function useKeyboardObserver() {

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     const [isKeyboardOpen, setIsKeyboardOpen] = useState(false);