@wordpress/block-editor/build-module/utils/transform-styles/transforms/wrap.js

Generic block editor.

/**
 * @constant string IS_ROOT_TAG Regex to check if the selector is a root tag selector.
 */
const IS_ROOT_TAG = /^(body|html|:root).*$/;

const wrap = (namespace, ignore = []) => node => {
  const updateSelector = selector => {
    if (ignore.includes(selector.trim())) {
      return selector;
    } // Anything other than a root tag is always prefixed.


    {
      if (!selector.match(IS_ROOT_TAG)) {
        return namespace + ' ' + selector;
      }
    } // HTML and Body elements cannot be contained within our container so lets extract their styles.

    return selector.replace(/^(body|html|:root)/, namespace);
  };

  if (node.type === 'rule') {
    return { ...node,
      selectors: node.selectors.map(updateSelector)
    };
  }

  return node;
};

export default wrap;
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