"Render state machine graph from CDK application" always fails

[anentropic]

Problem

I have defined two Step Functions state machines in my CDK (Python) application.

When I try to use the render option the preview panel opens but with this error:

Errors detected. Cannot preview.

Steps to reproduce the issue

Open my project then either use the AWS browser and click preview icon:

or Cmd+Shift+P and select "AWS: Render state machine graph from CDK application"

Expected behavior

See a graph

System details (run the AWS: About Toolkit command)

• OS: macOS 14.3.1
• Visual Studio Code version: 1.87.2 (Universal)
• AWS Toolkit version: v2.15.0

[wong-a]

Can you share an example the CDK code causing errors? Is this happening for any CDK generated state machines or just some?

[wong-a]

Unable to reproduce using the python cdk example here: https://github.com/aws-samples/aws-cdk-examples/tree/master/python/stepfunctions

Even after updating the dependency of aws-cdk-lib to the latest version (2.133.0) I am able to visualize the state machine. Maybe the generated definition is invalid, or the extension is unable to parse certain construct generated ASL.