Bangle.js emulator running out of memory

Ahh, yes, the issue is with the way Espruino doesn't handle let with scoping - and unhelpfully the minifier tends to overlap variable names whenever it can. It came up somewhere else recently, and using var is definitely the best bet.

As far as I know the Emulator has as much RAM as a real Bangle, so if you're hitting memory errors then it's probably a sign that your code just won't work on a real Bangle.

It's rare that normal code has issues like this especially on Bangle.js 2. Have you seen http://www.espruino.com/Code+Style#other-suggestions

Are you doing something like trying to transpile code?