Call original method from within a mock function

[Pavel910]

Hi! Is it possible to execute the original implementation of the method from within the mock? It would help simulate events which are otherwise performed in the cloud (like DynamoDB Streams, etc.). I'm using Dynalite to run tests against DynamoDB and the ability to call the original method would help a lot.

Here's an example:

AWS.mock("DynamoDB", "putItem", function(params, callback, original) {
   // Call original implementation
   const result = original(params);
   // Now insert data to Elasticsearch (which is otherwise performed in a lambda triggered by DynamoDB)
   elastic.index(result)
   // And finally execute mock callback
   callback(result);
});

There are other use cases as well, like conditionally returning a mocked result, and executing original otherwise...

Thanks for any info!
Cheers 🍻