feat: Add CloudFormation Language Extensions support (Fn::ForEach)#8637

Open

bnusunny wants to merge 58 commits intodevelopfrom

feat-language-extension

Commits on Apr 20, 2026

feat: add CloudFormation Language Extensions processing library
bnusunny
committed
feat: integrate language extensions into SAM CLI
bnusunny
committed
feat: add language extensions support to sam build
bnusunny
committed
feat: add language extensions support to sam package and deploy
bnusunny
committed
test: add validate, local invoke, and start-api integration tests
bnusunny
committed
feat: add telemetry tracking for CloudFormation Language Extensions
bnusunny
committed
test: trim language extensions integration tests to essential cases
bnusunny
committed
fix: Fn::Equals uses string comparison to match CloudFormation behavior
bnusunny
committed
fix: scope intrinsic resolution to Resources, Conditions, and Outputs only
bnusunny
committed
refactor: rename iter_resources to iter_regular_resources
bnusunny
committed
refactor: deduplicate _to_boolean and fix TOCTOU in expansion cache
bnusunny
committed
test: remove integration tests referencing deleted test data
bnusunny
committed
refactor: address PR review comments on style and test quality
bnusunny
committed
feat: add &{identifier} syntax support in Fn::ForEach expansion
bnusunny
committed
fix: remove unsupported list-of-lists identifier format from Fn::ForEach
bnusunny
committed
fix: use proper type annotation for intrinsic_resolver parameter
bnusunny
committed
fix: correct _process_section docstring about which sections it handles
bnusunny
committed
test: add tier1_extra markers and replace NamedTemporaryFile
bnusunny
committed
fix: narrow exception handling and bound expansion cache size
bnusunny
committed
test: add tests for cache eviction and narrowed exception handling
bnusunny
committed
fix: improve error visibility and add UTF-8 encoding for file reads
bnusunny
committed
fix: update test mocks to expect encoding='utf-8' parameter
bnusunny
committed
fix: MissingMappingKeyError now extends DeployFailedError
bnusunny
committed
fix: catch unexpected exceptions in child template expansion gracefully
bnusunny
committed
fix: deep-copy original_template consistently in expand_language_extensions
bnusunny
committed
test: verify original_template is independent from caller's input
bnusunny
committed

Commits on Apr 21, 2026

Commits on Apr 22, 2026