async def _generate_resource_html(www_directory_path: str, resource: Union[Resource, Identifiable], environment: Environment) -> None:
    resource_path = os.path.join(www_directory_path, resource.resource_type_name, resource.id)
    with _create_html_resource(resource_path) as f:
        f.write(await environment.get_template('page/%s.html.j2' % resource.resource_type_name).render_async({
            'page_resource': resource,
            resource.resource_type_name: resource,
        }))