flatiron/winston — pull request #119 by dhendo (2012-03-21 14:59:51+00:00)
Title: Add stringify support to the file transport

Allow a customised stringify implementation to be provided to the file transport.
- Allows tuning of what JSON data is logged to file (e.g. removing / renaming fields if present)
- Can transform the JSON to a non-JSON representation in the logfile if necessary.