add "console.log <class>.<method>" to top of function

I'm trying to add logging to methods much like I could do with esprima (code [here](https://gist.github.com/50e1901c66971a9ab0a4562607479e06)), but esprima doesn't like arrow constructs. recast parses the [source](https://gist.github.com/a25c3069b3cef507b7fc9009e4e8860f) no problem but I don't know how to add code to the AST.

Start with the linked esprima and recast source examples to understand the requested transformation and how arrow constructs are represented. Determine how a console.log entry naming the class and method could be added to the AST, then verify that the transformed source preserves the requested logging behavior.

Written by the indexing model from the issue text.