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AWS serverless-application-model documentation change

Service: serverless-application-model · 2026-05-19 · Documentation low

File: serverless-application-model/latest/developerguide/doc-history.md

Summary

Added documentation about AWS SAM CLI support for AWS::LanguageExtensions transform

Security assessment

Change documents new feature support for CloudFormation language extensions. No security vulnerabilities or security features mentioned.

Diff

diff --git a/serverless-application-model/latest/developerguide/doc-history.md b/serverless-application-model/latest/developerguide/doc-history.md
index 82ebf01ca..af5e336a8 100644
--- a//serverless-application-model/latest/developerguide/doc-history.md
+++ b//serverless-application-model/latest/developerguide/doc-history.md
@@ -17,0 +18 @@ Change| Description| Date
+Added AWS SAM CLI support for the AWS::LanguageExtensions transform| The AWS SAM CLI now expands `Fn::ForEach`, `Fn::Length`, `Fn::ToJsonString`, and `Fn::FindInMap` with `DefaultValue` locally, so `sam build`, `sam package`, `sam deploy`, `sam sync`, `sam validate`, and the `sam local` commands work with templates that use the `AWS::LanguageExtensions` transform. To learn more, see [CloudFormation language extensions support](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-language-extensions.html).| May 13, 2026