t.coffee

#iced = require('iced-coffee-script').iced
  
fs = require("fs")  
class T
  constructor: (cb) ->
    console.log "asdf"
    await fs.readFile __filename, "utf8", defer(err,res)
    cb(err,res)

module.exports = T

ta.coffee

T = require "./t.js"

await t = new T defer(err,res)
console.log err 
console.log res

I generally do not use await/defer in constructors, but I guess your system can work.

I got your example to work as you have it, but I changed line 1 of ta.coffee to T = require './t' --- that is, I dropped the .js suffix.

Which version of ICS do you have? I have 1.6.3-g

I am also on IcedCoffeeScript version 1.6.3-g

I dropped the ".js" and still got the same error.

I was trying to think of a way to avoid the callback in the constructor, but haven't yet.
The real code is (the bare beginnings of) a DB framework, and I want to get a list of all the tables and their columns to populate an instance variable. await in the constructor seems to be the way to do it so far.