Problem with es6 import

[trading-peter]

When I try to import version ^4.0.0 in chrome like shown in the readme, I get an error:
Uncaught SyntaxError: The requested module './node_modules/moment-range/dist/moment-range.js' does not provide an export named 'extendMoment'

When I try version ^3.0.0 I get:
Uncaught SyntaxError: The requested module '../../es6-symbol/index.js' does not provide an export named 'default'

Here is a glitch project that shows the error. I'm on Chrome 71.

https://spring-leopon.glitch.me

[depyronick]

import Moment from 'moment';
import MomentRange from "moment-range";

const moment = MomentRange.extendMoment(Moment);