Cannot use hasListeners(), _listeners instead

[jdelafon]

I cannot use this:

import * as chromeMock from 'sinon-chrome'

chromeMock.webRequest.onBeforeRequest.hasListeners()

TypeError: chromeMock.webRequest.onBeforeRequest.hasListeners is not a function

But I can do this instead (which my IDE and myself don't like much):

import * as chromeMock from 'sinon-chrome'

chromeMock.webRequest.onBeforeRequest._listeners

[[Function ...]]

Looks like a bug to me, is it?