Ask HN: Exporting AWS Lambda?

I'm designing a web app and I'm considering using AWS Lambda. My concern is that I'm going to need to offer an enterprise version of my app to be able to be run on premises, but that I won't be able to export AWS Lambda functions into a self contained image of some sort the way I could with an AMI to hand over to the customer. I couldn't find an answer to this on the Lambda site. Any insight would be appreciated.

Thanks in advance.