delete method
Deletes a topic.
This method returns the following error codes: * PERMISSION_DENIED if
the requesting user is not allowed to delete the requested topic or for
access errors. * FAILED_PRECONDITION if the requested topic has already
been deleted. * NOT_FOUND if no course or topic exists with the
requested ID.
Request parameters:
courseId - Identifier of the course. This identifier can be either the
Classroom-assigned identifier or an alias.
id - Identifier of the topic to delete.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Empty.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Empty> delete(
  core.String courseId,
  core.String id, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v1/courses/' +
      commons.escapeVariable('$courseId') +
      '/topics/' +
      commons.escapeVariable('$id');
  final response_ = await _requester.request(
    url_,
    'DELETE',
    queryParams: queryParams_,
  );
  return Empty.fromJson(response_ as core.Map<core.String, core.dynamic>);
}