@wordpress/edit-post/build-module/store/utils.js

Edit Post module for WordPress.

/**
 * Given a selector returns a functions that returns the listener only
 * if the returned value from the selector changes.
 *
 * @param  {function} selector Selector.
 * @param  {function} listener Listener.
 * @return {function}          Listener creator.
 */
export var onChangeListener = function onChangeListener(selector, listener) {
  var previousValue = selector();
  return function () {
    var selectedValue = selector();

    if (selectedValue !== previousValue) {
      previousValue = selectedValue;
      listener(selectedValue);
    }
  };
};
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