@gravity-ui/graph/build/react-components/hooks/usePrevious.js

Modern graph editor component

import { useEffect, useRef } from "react";
/**
 * Hook for tracking the previous value of a state.
 *
 * @example
 * ```tsx
 * const [count, setCount] = useState(0);
 * const prevCount = usePrevious(count);
 *
 * ```
 *
 * @template T - Type of the value being tracked
 * @param value - Current value whose previous state needs to be tracked
 * @returns Previous value or undefined on first render
 */
export function usePrevious(value) {
    const ref = useRef();
    useEffect(() => {
        ref.current = value;
    }, [value]);
    return ref.current;
}