> The real problem is the core NodeJS libraries aren't promise compliant. I don't know if there's a module that cleanly wraps all of these in their promise analogs but that'd be the best thing here.

There's a few of these in npm, but I think the best one is probably the pr package [1], which lets you do e.g. var fs = require("pr/fs") and then use Bluebird-promise returning versions of the fs methods.

[1]: https://npmjs.org/package/pr