Enable Terraform function version validation by default (drop the validateTerraformFunctionVersions gate) in 0.24 #352

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1. so0k commented on Jul 30, 2026

   

   so0k

   on Jul 30, 2026

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   PR #362 implements this, together with #342 (same flag, same work).

   Correction: the key name in this issue's title doesn't exist

   This issue refers to validateTerraformFunctionVersions, but that string appears nowhere in the tree — repo-wide search, node_modules excluded, zero hits. The real context key is validateFunctionVersions, declared in packages/cdktn/src/features.ts and read in packages/cdktn/src/terraform-stack.ts.

   Flagging it rather than silently fixing it, because the wrong name is the kind of thing that propagates into changelogs and migration notes — and a migration note telling users to remove a key they never set would be worse than no note. #342 quotes the real code, so that issue was used as the source of truth for the implementation.

   Worth renaming this issue's title if you want the history to read cleanly.

   What landed

   The flag is deleted outright, not kept as an accepted-but-ignored no-op, following the repo's existing precedent 3c323e76d. Deletion already gives the backwards-compatible behaviour: cdktf.json's context is an untyped passthrough map with no unknown-key validation, so a stale "validateFunctionVersions": "true" simply becomes inert rather than erroring.

   ValidateFunctionVersionSupport is now registered on every TerraformStack unconditionally, alongside ValidateProviderPresence and ValidateProviderFunctionTargetSupport.

   Behaviour change to be aware of: setting the key to a falsy value no longer opts out. Projects using one of the 7 version-constrained functions (base64gunzip, cidrcontains, convert, ephemeralasnull, issensitive, templatestring, urldecode) outside their declared targetVersions will now fail synth — raise targetVersions in cdktf.json, or pass skipValidation: true to the App.

   Full details and verification in #362.
2. so0k

   closed this as completedin #362on Jul 30, 2026
3. jsteinich

   added a commit that references this issue on Aug 1, 2026

   feat(lib)!: validate Terraform function versions by default (open-con…

   ...

   This issue will close once commit 4ac0736 is merged into the 'main' branch.

   4ac0736
4. X-Guardian

   added a commit that references this issue on Aug 10, 2026

   feat(lib)!: validate Terraform function versions by default (open-con…

   ...

   This issue will close once commit 8b5a667 is merged into the 'main' branch.

   8b5a667
5. github-actions commented on Aug 30, 2026

   

   github-actionsBot

   on Aug 30, 2026 – with GitHub Actions

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   I'm going to lock this issue because it has been closed for 30 days. This helps our maintainers find and focus on the active issues. If you've found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.
6. github-actions

   locked as resolved and limited conversation to collaborators on Aug 30, 2026