src/vs/workbench/browser/parts/notifications/notificationsViewer.ts/NotificationsListDelegate/getTemplateId
class NotificationsListDelegate:	getTemplateId(element: INotificationViewItem): string {
		if (element instanceof NotificationViewItem) {
			return NotificationRenderer.TEMPLATE_ID;
		}

		throw new Error('unknown element type: ' + element);
	}