list method
Returns the list of all transition route groups in the specified flow.
Request parameters:
parent - Required. The flow to list all transition route groups for.
Format: `projects//locations//agents//flows/` or
`projects//locations//agents/.
Value must have pattern
^projects/\[^/\]+/locations/\[^/\]+/agents/\[^/\]+$.
languageCode - The language to list transition route groups for. The
following fields are language dependent: *
TransitionRouteGroup.transition_routes.trigger_fulfillment.messages *
TransitionRouteGroup.transition_routes.trigger_fulfillment.conditional_cases
If not specified, the agent's default language is used.
Many languages
are supported. Note: languages must be enabled in the agent before they
can be used.
pageSize - The maximum number of items to return in a single page. By
default 100 and at most 1000.
pageToken - The next_page_token value returned from a previous list
request.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a GoogleCloudDialogflowCxV3ListTransitionRouteGroupsResponse.
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<GoogleCloudDialogflowCxV3ListTransitionRouteGroupsResponse> list(
  core.String parent, {
  core.String? languageCode,
  core.int? pageSize,
  core.String? pageToken,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (languageCode != null) 'languageCode': [languageCode],
    if (pageSize != null) 'pageSize': ['${pageSize}'],
    if (pageToken != null) 'pageToken': [pageToken],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v3/' + core.Uri.encodeFull('$parent') + '/transitionRouteGroups';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return GoogleCloudDialogflowCxV3ListTransitionRouteGroupsResponse.fromJson(
    response_ as core.Map<core.String, core.dynamic>,
  );
}