Serverless Rules currently support checking infrastructure-as-code templates from CloudFormation/SAM, and Terraform. It also supports frameworks that synthesizes to CloudFormation or Terraform, such as CDK or Serverless Framework.
This issue is to track interest for other frameworks, or native support for frameworks that synthesizes to CloudFormation/Terraform.
Please note that other frameworks won't be supported natively until at least version 1! But sharing your feedback here will help prioritize afterwards.