What is the problem?

Currently, the failure response for an API Gateway REST API Step Functions Integration is not valid JSON. It is missing a comma between the error and cause properties.

Reproduction Steps

Use a StepFunctionsRestApi and have it return a Fail in the synchronous express step function.

What did you expect to happen?

A valid JSON payload should be returned:

{ 
  "error": "error",
  "cause": "cause"
}

What actually happened?

Invalid JSON payload is returned, missing a comma:

{ 
  "error": "error"
  "cause": "cause"
}

CDK CLI Version

2.15.0

Framework Version

No response

Node.js Version

v14.18.1

OS

MacOS

Language

Typescript

Language Version

No response

Other information

No response