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

WordPress higher-order components (HOCs).

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = usePrevious;
var _element = require("@wordpress/element");
/**
 * WordPress dependencies
 */

/**
 * 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.
 */
function usePrevious(value) {
  const ref = (0, _element.useRef)();

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

  // Return previous value (happens before update in useEffect above).
  return ref.current;
}
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