You might like the make_esc/errify pattern [0]. You can apply the same function to any number of error callbacks in order to unify error handling. Works great with Iced CoffeeScript but also works well without. I can provide more examples but I think you'll get it.

[0]: https://github.com/nextorigin/el-borracho/blob/master/src/re...

P.S. Iced3 compiles to ES6 await so all of this has been working together for quite a while.