Using of Ecma 2015 export/import throws error

[shacharsol]

i'm trying to use postscrib in an sdk i'm creating , it works very good, but when i try to add export class or import statements it fails, i overcome this by using other way of export, but i'm loosing all the power of class in ecma 2015, is there away to over come this?
This the error i get: Uncaught SyntaxError: Unexpected token export
the trace:
Uncaught Error: Script error. - : 0
at Object.error (cro:170)
at active.win.onerror (cro:244)

[kirkbushell]

It's really hard to help with no code provided.