Shield constructor
      
      Shield({ 
    
    
- required String region,
 - AwsClientCredentials? credentials,
 - AwsClientCredentialsProvider? credentialsProvider,
 - Client? client,
 - String? endpointUrl,
 
Implementation
Shield({
  required String region,
  _s.AwsClientCredentials? credentials,
  _s.AwsClientCredentialsProvider? credentialsProvider,
  _s.Client? client,
  String? endpointUrl,
}) : _protocol = _s.JsonProtocol(
        client: client,
        service: _s.ServiceMetadata(
          endpointPrefix: 'shield',
        ),
        region: region,
        credentials: credentials,
        credentialsProvider: credentialsProvider,
        endpointUrl: endpointUrl,
      );