list method
Lists the drafts in the user's mailbox.
Request parameters:
userId - The user's email address. The special value me can be used to
indicate the authenticated user.
includeSpamTrash - Include drafts from SPAM and TRASH in the
results.
maxResults - Maximum number of drafts to return. This field defaults to
100. The maximum allowed value for this field is 500.
pageToken - Page token to retrieve a specific page of results in the
list.
q - Only return draft messages matching the specified query. Supports
the same query format as the Gmail search box. For example,
"from:someuser@example.com rfc822msgid: is:unread".
$fields - Selector specifying which fields to include in a partial
response.
Completes with a ListDraftsResponse.
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<ListDraftsResponse> list(
  core.String userId, {
  core.bool? includeSpamTrash,
  core.int? maxResults,
  core.String? pageToken,
  core.String? q,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (includeSpamTrash != null) 'includeSpamTrash': ['${includeSpamTrash}'],
    if (maxResults != null) 'maxResults': ['${maxResults}'],
    if (pageToken != null) 'pageToken': [pageToken],
    if (q != null) 'q': [q],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'gmail/v1/users/' + commons.escapeVariable('$userId') + '/drafts';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return ListDraftsResponse.fromJson(
    response_ as core.Map<core.String, core.dynamic>,
  );
}