Unable to create a Lambda Alias to version $LATEST

[igilham]

CloudFormation supports an AWS::Lambda::Alias with a FunctionVersion of $LATEST.

"LambdaAlias": {
        "Properties": {
            "FunctionName": {
                "Ref": "LambdaFunction"
            },
            "FunctionVersion": "$LATEST",
            "Name": "PROD"
        },
        "Type": "AWS::Lambda::Alias"
    }
}

I can find no way to achieve the same using the abstractions provided by the AWS CDK using either lambda.Alias or lambda.CfnAlias (which has no documentation at present).

new lambda.Alias(this, 'FunctionAlias', {
    aliasName: environmentParam.ref,
    version: '$LATEST', // error
})

The CDK seems to assume that I need to build a lambda.Version, but this is not what I want for my use case.