@wordpress/block-editor/build-module/components/block-list/use-block-props/use-block-custom-class-name.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useSelect } from '@wordpress/data';
import { getBlockType } from '@wordpress/blocks';
/**
 * Internal dependencies
 */

import { store as blockEditorStore } from '../../../store';
/**
 * Returns the custom class name if the block is a light block.
 *
 * @param {string} clientId The block client ID.
 *
 * @return {string} The custom class name.
 */

export function useBlockCustomClassName(clientId) {
  // It's good for this to be a separate selector because it will be executed
  // on every attribute change, while the other selectors are not re-evaluated
  // as much.
  return useSelect(select => {
    const {
      getBlockName,
      getBlockAttributes
    } = select(blockEditorStore);
    const attributes = getBlockAttributes(clientId);

    if (!attributes?.className) {
      return;
    }

    const blockType = getBlockType(getBlockName(clientId));
    const hasLightBlockWrapper = blockType?.apiVersion > 1;

    if (!hasLightBlockWrapper) {
      return;
    }

    return attributes.className;
  }, [clientId]);
}
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