wp-calypso/client/state/document-head/selectors/get-document-head-unread-count.js

import 'calypso/state/document-head/init';

/**
 * Returns a count reflecting unread items.
 * @param  {Object}  state  Global state tree
 * @returns {?string}        Unread count (string because it can be e.g. '40+')
 */
export function getDocumentHeadUnreadCount( state ) {
	return state.documentHead.unreadCount;
}