https://aws.amazon.com/cloudformation/ is an Infrastructure as Code (IaC) service that allows you to model your cloud resources in template files that can be authored or generated in a variety of languages. CloudFormation helps customers to quickly and consistently deploy and manage cloud resources, but like all IaC tools, it faced challenges keeping up with the rapid pace of innovation of AWS services.
At launch, CloudFormation supported 13 out of 15 available AWS services with 48 total resource types.
The open source resource model that customers and partners use to publish third-party registry extensions is the same model used by AWS service teams to provide CloudFormation support for their features.
The developer experience for creating registry extensions has some rough edges, particularly for languages other than Java, which is the language of choice on AWS service teams for their resource types.