Streamline error: To use 'arguments' inside streamlined function, read the doc and set the 'ninja' option

model_.coffee

module.exports = class Model

    toString: (raw) ->
        return super if raw
        'test 1 2 3'

model_.js

// Generated by CoffeeScript 1.3.1
var Model;

module.exports = Model = (function() {

  Model.name = 'Model';

  function Model() {}

  Model.prototype.toString = function(raw) {
    if (raw) {
      return Model.__super__.toString.apply(this, arguments);
    }
    return 'test 1 2 3';
  };

  return Model;

})();

This was my mistake -- I was compiling CoffeeScript twice by accident.