ES6 import doesn't work with 'zipkin-context-cls'

[NuclleaR]

I have typescript project.
When I try to use import CLSContext from 'zipkin-context-cls' it returns undefined
but require('zipkin-context-cls') works as expected

[jcchavezs]

Thanks for reaching out @NuclleaR could you reproduce the failure in some CI test?