get_legacy_widget_block_editor_settings

Returns the block editor settings needed to use the Legacy Widget block which
is not registered by default.

function get_legacy_widget_block_editor_settings() {
	$editor_settings = array();

	/**
	 * Filters the list of widget-type IDs that should **not** be offered by the
	 * Legacy Widget block.
	 *
	 * Returning an empty array will make all widgets available.
	 *
	 * @since 5.8.0
	 *
	 * @param string[] $widgets An array of excluded widget-type IDs.
	 */
	$editor_settings['widgetTypesToHideFromLegacyWidgetBlock'] = apply_filters(
		'widget_types_to_hide_from_legacy_widget_block',
		array(
			'pages',
			'calendar',
			'archives',
			'media_audio',
			'media_image',
			'media_gallery',
			'media_video',
			'search',
			'text',
			'categories',
			'recent-posts',
			'recent-comments',
			'rss',
			'tag_cloud',
			'custom_html',
			'block',
		)
	);

	return $editor_settings;
}