@wordpress/block-editor/build-module/hooks/custom-class-name.native.js

Generic block editor.

/**
 * External dependencies
 */
import classnames from 'classnames';
/**
 * WordPress dependencies
 */

import { addFilter } from '@wordpress/hooks';
import { hasBlockSupport } from '@wordpress/blocks';
/**
 * Filters registered block settings, extending attributes to include `className`.
 *
 * @param {Object} settings Original block settings.
 *
 * @return {Object} Filtered block settings.
 */

export function addAttribute(settings) {
  if (hasBlockSupport(settings, 'customClassName', true)) {
    // Gracefully handle if settings.attributes is undefined.
    settings.attributes = { ...settings.attributes,
      className: {
        type: 'string'
      }
    };
  }

  return settings;
}
/**
 * Override props assigned to save component to inject the className, if block
 * supports customClassName. This is only applied if the block's save result is an
 * element and not a markup string.
 *
 * @param {Object} extraProps Additional props applied to save element.
 * @param {Object} blockType  Block type.
 * @param {Object} attributes Current block attributes.
 *
 * @return {Object} Filtered props applied to save element.
 */

export function addSaveProps(extraProps, blockType, attributes) {
  if (hasBlockSupport(blockType, 'customClassName', true) && attributes.className) {
    extraProps.className = classnames(extraProps.className, attributes.className);
  }

  return extraProps;
}
addFilter('blocks.registerBlockType', 'core/custom-class-name/attribute', addAttribute);
addFilter('blocks.getSaveContent.extraProps', 'core/custom-class-name/save-props', addSaveProps);
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