UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3147.0 Safari/537.36

Steps to reproduce the problem:
Please consider to support ES Modules in Web Worker.

What is the expected behavior?
work as below.
https://html.spec.whatwg.org/multipage/workers.html#module-worker-example

What went wrong?
no work.

Did this work before? N/A 

Chrome version: 61.0.3147.0  Channel: n/a
OS Version: 10.0
Flash Version: