list method
Lists ServiceClasses in a given project and location.
Request parameters:
parent - Required. The parent resource's name. ex.
projects/123/locations/us-east1
Value must have pattern ^projects/\[^/\]+/locations/\[^/\]+$.
filter - A filter expression that filters the results listed in the
response.
orderBy - Sort the results by a certain order.
pageSize - The maximum number of results per page that should be
returned.
pageToken - The page token.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a ListServiceClassesResponse.
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<ListServiceClassesResponse> list(
  core.String parent, {
  core.String? filter,
  core.String? orderBy,
  core.int? pageSize,
  core.String? pageToken,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (filter != null) 'filter': [filter],
    if (orderBy != null) 'orderBy': [orderBy],
    if (pageSize != null) 'pageSize': ['${pageSize}'],
    if (pageToken != null) 'pageToken': [pageToken],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1/' + core.Uri.encodeFull('$parent') + '/serviceClasses';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return ListServiceClassesResponse.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}