Lambda "build" assets

We would like to leverage the aws-lambda-builders project (part of SAM CLI) in order to allow CDK users to build AWS Lambda bundles.

Requirement (API sketch):

new lambda.Function(this, 'MyFunction', {
  code: lambda.Code.build('/path/to/lambda/handler'),
  runtime: lambda.Runtime.Xxx,
  handler: 'foo.bar'
});

Ideally, this is all the user should need to specify. The lambda.Code.build class should be able to deduce most of the information needed in order to tell the toolkit to invoke aws-lambda-builders via it’s JSON RPC protocol when assets are prepared (similar to any other asset).

Notes:

• Installation experience: it might okay if users would have to manually install aws-lambda-builders through pip install. We should consider if the toolkit can do this automatically upon first use?
• SAM CLI uses heuristics to determine various options. The CDK should be able to use similar heuristics.

[eladb]

I think at a minimum we should provide guidance on how to use the SAM build capabilities as a pre synthesis step in order to produce lambda bundle zip files that can later be referenced as file assets for Lambda code.

[zoonman]

Hey guys, is there any progress on the issue for typescript version?