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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | import { useEffect, useState } from "react"; const useWindowSize = () => { // Initialize state with undefined width/height so server and client renders match // Learn more here: https://joshwcomeau.com/react/the-perils-of-rehydration/ const [windowSize, setWindowSize] = useState<{ width?: number; height?: number; }>({ width: undefined, height: undefined, }); useEffect(() => { // Handler to call on window resize function handleResize() { // Set window width/height to state setWindowSize({ width: window.innerWidth, height: window.innerHeight, }); } // Add event listener window.addEventListener("resize", handleResize); // Call handler right away so state gets updated with initial window size handleResize(); // Remove event listener on cleanup return () => window.removeEventListener("resize", handleResize); }, []); // Empty array ensures that effect is only run on mount return windowSize; }; export default useWindowSize; |