How to check that a lambda layer has been added before adding it

[jabalsad]

If I read the source code correctly, there is no way to check whether a lambda function layer already exists before adding it.

The lambda.Function Construct only allows you to either:

• supply a list of layers to add as part of the construct props lambda.FunctionProps
• call the fn.addLayers(...) function defined here

How would I check to see if a layer already exists on a function before adding it (after a function construct has already been created)? It doesn't seem like I should be accessing _layers variable directly.

[indrora]

Since the CDK is a wrapper around CloudFormation, I don't know that this is possible until CloudFormation deployment time.