title: AWS StepFunction CDK resultpath set to null
body: <p>I am not able to find a way to specify 'null' to result path.</p>
  <p>As pointed out here:
  <a href="https://docs.aws.amazon.com/step-functions/latest/dg/input-output-resultpath.html" rel="nofollow noreferrer">https://docs.aws.amazon.com/step-functions/latest/dg/input-output-resultpath.html</a></p>
  <p>I want to implement, in CDK, this: &quot;Discard the Result and Keep the Original Input&quot;</p>
  <p>I have read this discussion:
  <a href="https://github.com/aws/aws-cdk/issues/1805" rel="nofollow noreferrer">https://github.com/aws/aws-cdk/issues/1805</a></p>
  <p>but there is no final answer although it has been closed.
  Below a code snip:</p>
  <pre><code>const verifyDeviceJob = new tasks.LambdaInvoke(this, 'VerifyDeviceJobTask', {
        lambdaFunction: verifyConditionDeviceFn,
        inputPath: '$.detail',      
        resultPath: //HOW TO DECLARE IT TO NULL??
  });
  </code></pre>