extend SomeClass.build() fails in ES6

[issa-tseng]

TypeError: Cannot call a class constructor without |new|

where SomeClass is some ES6-generated Model.build classdef, for example.

this happens because ES6 constructors cannot be called without keyword new, but coffeescript 1.x does not know this.

hmmm.

[issa-tseng]

so far i have not found any solution that preserves both of:

• solving the problem so that eg ES6 extends Model.build does not break on second inheritance, and
• preserves IE support.

this is a mess.