@wordpress/compose/build-module/hooks/use-previous/index.js

WordPress higher-order components (HOCs).

/**
 * WordPress dependencies
 */
import { useEffect, useRef } from '@wordpress/element';

/**
 * Use something's value from the previous render.
 * Based on https://usehooks.com/usePrevious/.
 *
 * @param value The value to track.
 *
 * @return The value from the previous render.
 */
export default function usePrevious(value) {
  const ref = useRef();

  // Store current value in ref.
  useEffect(() => {
    ref.current = value;
  }, [value]); // Re-run when value changes.

  // Return previous value (happens before update in useEffect above).
  return ref.current;
}
//# sourceMappingURL=index.js.map