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

Generic block editor.

/**
 * WordPress dependencies
 */
import { addFilter } from '@wordpress/hooks';
import { hasBlockSupport, getBlockDefaultClassName } from '@wordpress/blocks';

/**
 * Override props assigned to save component to inject generated className if
 * block supports it. 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.
 *
 * @return {Object} Filtered props applied to save element.
 */
export function addGeneratedClassName(extraProps, blockType) {
  // Adding the generated className.
  if (hasBlockSupport(blockType, 'className', true)) {
    if (typeof extraProps.className === 'string') {
      // We have some extra classes and want to add the default classname
      // We use uniq to prevent duplicate classnames.

      extraProps.className = [...new Set([getBlockDefaultClassName(blockType.name), ...extraProps.className.split(' ')])].join(' ').trim();
    } else {
      // There is no string in the className variable,
      // so we just dump the default name in there.
      extraProps.className = getBlockDefaultClassName(blockType.name);
    }
  }
  return extraProps;
}
addFilter('blocks.getSaveContent.extraProps', 'core/generated-class-name/save-props', addGeneratedClassName);
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