@wordpress/components/build/utils/hooks/use-on-value-update.js

UI components for WordPress.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useOnValueUpdate = useOnValueUpdate;
var _compose = require("@wordpress/compose");
var _element = require("@wordpress/element");
/* eslint-disable jsdoc/require-param */
/**
 * WordPress dependencies
 */

/**
 * Context object for the `onUpdate` callback of `useOnValueUpdate`.
 */

/**
 * Calls the `onUpdate` callback when the `value` changes.
 */
function useOnValueUpdate(
/**
 * The value to watch for changes.
 */
value,
/**
 * Callback to fire when the value changes.
 */
onUpdate) {
  const previousValueRef = (0, _element.useRef)(value);
  const updateCallbackEvent = (0, _compose.useEvent)(onUpdate);
  (0, _element.useLayoutEffect)(() => {
    if (previousValueRef.current !== value) {
      updateCallbackEvent({
        previousValue: previousValueRef.current
      });
      previousValueRef.current = value;
    }
  }, [updateCallbackEvent, value]);
}
/* eslint-enable jsdoc/require-param */
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