With macros, you can perform custom processing on templates, from simple actions like find-and-replace operations to extensive transformations of entire templates.
To get an idea of the breadth of possibilities, consider the AWS::Include and AWS::Serverless transforms, which are macros hosted by CloudFormation:
When a macro runs, the owner of the Lambda function is billed for any charges related to the execution of that function.
The AWS::Include and AWS::Serverless transforms are macros hosted by CloudFormation. There is no charge for using them.
In addition to the examples in this section, you can find example macros, including source code and templates, in our GitHub repository. These examples are provided 'as-is' for instructional purposes.
Update request for CloudFormation custom resources
Macros overview
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