@wordpress/block-editor/build-module/hooks/metadata.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { addFilter } from '@wordpress/hooks';
import { getBlockSupport } from '@wordpress/blocks';
const META_ATTRIBUTE_NAME = 'metadata';
export function hasBlockMetadataSupport(blockType, feature = '') {
  // Only core blocks are allowed to use __experimentalMetadata until the fetaure is stablised.
  if (!blockType.name.startsWith('core/')) {
    return false;
  }

  const support = getBlockSupport(blockType, '__experimentalMetadata');
  return !!(true === support || support?.[feature]);
}
/**
 * Filters registered block settings, extending attributes to include `metadata`.
 *
 * see: https://github.com/WordPress/gutenberg/pull/40393/files#r864632012
 *
 * @param {Object} blockTypeSettings Original block settings.
 * @return {Object} Filtered block settings.
 */

export function addMetaAttribute(blockTypeSettings) {
  // Allow blocks to specify their own attribute definition with default values if needed.
  if (blockTypeSettings?.attributes?.[META_ATTRIBUTE_NAME]?.type) {
    return blockTypeSettings;
  }

  const supportsBlockNaming = hasBlockMetadataSupport(blockTypeSettings, 'name');

  if (supportsBlockNaming) {
    blockTypeSettings.attributes = { ...blockTypeSettings.attributes,
      [META_ATTRIBUTE_NAME]: {
        type: 'object'
      }
    };
  }

  return blockTypeSettings;
}
export function addSaveProps(extraProps, blockType, attributes) {
  if (hasBlockMetadataSupport(blockType)) {
    extraProps[META_ATTRIBUTE_NAME] = attributes[META_ATTRIBUTE_NAME];
  }

  return extraProps;
}
addFilter('blocks.registerBlockType', 'core/metadata/addMetaAttribute', addMetaAttribute);
addFilter('blocks.getSaveContent.extraProps', 'core/metadata/save-props', addSaveProps);
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