Did you try running the code with the change you suggested? The lattermost closure in your snippet (`key => { ... }`) needs to be able to reference `message`, but you've moved it out of scope.

This and similar subthreads in this Show HN entry are a good example of pointless, hostile, obnoxiously-pedantic-without-even-being-technically-correct wankery that makes HN an often terrible place for conversations.