useLayoutEffect
useLayoutEffect is a React Hook that allows developers to perform side effects synchronously after all DOM mutations but before the browser paints the screen. It is similar to useEffect but runs earlier in the rendering lifecycle, making it suitable for operations that need to measure or manipulate the DOM layout immediately. This ensures that visual updates happen without flickering or layout shifts.
Developers should use useLayoutEffect when they need to read or modify the DOM layout before the browser repaints, such as measuring element sizes, adjusting scroll positions, or applying animations that depend on layout calculations. It is essential for preventing visual glitches in user interfaces where timing is critical, but it should be used sparingly as it blocks painting and can impact performance if overused.