@wordpress/block-editor/src/hooks/metadata.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { addFilter } from '@wordpress/hooks';
const META_ATTRIBUTE_NAME = 'metadata';

/**
 * 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;
	}

	blockTypeSettings.attributes = {
		...blockTypeSettings.attributes,
		[ META_ATTRIBUTE_NAME ]: {
			type: 'object',
		},
	};

	return blockTypeSettings;
}

addFilter(
	'blocks.registerBlockType',
	'core/metadata/addMetaAttribute',
	addMetaAttribute
);