How to specify "Transform: AWS::SecretsManager-2020-07-23" in CDK（L1）.

[naokimakino]

I would like to use cron to specify the time of rotation of the secret in the secret manager.
When I tried to implement this in cdk, I decided to use the L1 constructor because the L2 constructor cannot specify the time in a cron expression.

However, when I try to deploy it, I get an error because I have not specified "Transform: AWS::SecretsManager-2020-07-23".

If I use the L1 constructor, do I have to rewrite the template after it is generated?

CREATE_FAILED        | AWS::SecretsManager::RotationSchedule       | RotationSchedule To use the HostedRotationLambda property, you must use the AWS::SecretsManager transform

example

    const secret = new CfnSecret(this, 'Secret', {
      generateSecretString: {
        generateStringKey: 'password',
        secretStringTemplate: JSON.stringify({
          username: 'example username',
        })
      }
    });

    new CfnSecretTargetAttachment(this, 'SecretTargetAttachment', {
      secretId: secrets.ref,
      targetId: 'example clusterIdentifier',
      targetType: 'AWS::RDS::DBCluster'
    });

    new CfnRotationSchedule(this, 'RotationSchedule', {
      secretId: secret.ref,
      hostedRotationLambda: {
        rotationType: 'PostgreSQLSingleUser',
      },
      rotationRules: {
        scheduleExpression: 'cron(0 9 1 * ? *)'
      }
    });

[naokimakino]

I solved the problem by doing the following

stack.addTransform('AWS::SecretsManager-2020-07-23');

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.