describeRoleAlias method
Describes a role alias.
May throw InvalidRequestException. May throw ThrottlingException. May throw UnauthorizedException. May throw ServiceUnavailableException. May throw InternalFailureException. May throw ResourceNotFoundException.
Parameter roleAlias :
The role alias to describe.
Implementation
Future<DescribeRoleAliasResponse> describeRoleAlias({
  required String roleAlias,
}) async {
  ArgumentError.checkNotNull(roleAlias, 'roleAlias');
  _s.validateStringLength(
    'roleAlias',
    roleAlias,
    1,
    128,
    isRequired: true,
  );
  final response = await _protocol.send(
    payload: null,
    method: 'GET',
    requestUri: '/role-aliases/${Uri.encodeComponent(roleAlias)}',
    exceptionFnMap: _exceptionFns,
  );
  return DescribeRoleAliasResponse.fromJson(response);
}