Aliases are still a half solution to this problem though, you would still need logic in your code to say "if alias == PROD then ... else ..." for configuration, something I'd rather do without.

EDIT: by configuration I mean configuration that's specific to an environment. Imagine you had a Lambda that wrote data to an S3 bucket, you wouldn't want to accidentally mix TEST/LIVE data in the same location, so you would use a configuration property to inform the Lambda where to write.