This extension focuses on reference errors in Cloudformation YAML files and their sub-stack resources. It is best used together with a linting plugin like vscode-cfn-lint, which can warn you about errors specific to AWS resources.
Here are some things this extension will warn you about:
!Refs to nonexistent values!Subs with references to nonexistent values!Ifs referencing conditions that do not exist!FindInMaps referencing maps that do not existAWS::CloudFormation::Stackparameters (with and without default values) missing values
The extension should be triggered automatically when loading YAML or YML files and it should avoid parsing non-cloudformation YAML files.
To run it manually, open the command pallet and select "Cloud Formation YAML Validator: Validate YAML"
To recursively search in sub stacks, open the command pallet and select "Cloud Formation YAML Validator: Validate YAML, recurse into sub stacks"
Known issues can be found here: https://github.com/champgm/cloudformation-yaml-validator/issues
Please log more if you find any.
