@wordpress/edit-post/build-module/utils/meta-boxes.js

/**
 * Function returning the current Meta Boxes DOM Node in the editor
 * whether the meta box area is opened or not.
 * If the MetaBox Area is visible returns it, and returns the original container instead.
 *
 * @param   {string} location Meta Box location.
 * @return {string}          HTML content.
 */
export var getMetaBoxContainer = function getMetaBoxContainer(location) {
  var area = document.querySelector(".edit-post-meta-boxes-area.is-".concat(location, " .metabox-location-").concat(location));

  if (area) {
    return area;
  }

  return document.querySelector('#metaboxes .metabox-location-' + location);
};
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