AWS SAM CLI Adds CloudFormation Language Extensions Support
infraawsengineer
feature
AWS SAM CLI now supports CloudFormation Language Extensions, allowing developers to define reusable resource templates locally. This eliminates the need to choose between reducing IaC duplication and using SAM CLI's local development workflow, accelerating iteration and reducing debugging time by processing extensions in memory. Developers working with serverless applications on AWS and utilizing SAM CLI for local development will benefit from this update.
Read the original announcement →
https://aws.amazon.com/about-aws/whats-new/2026/05/aws-sam-cli-cloudformation/