Add event.composedPath()

Events dispatched through jsdom seem to be missing the path property: https://dom.spec.whatwg.org/#event-path

An event has an associated path. A path is a list of tuples, each of which consists of an item (an EventTarget object) and a target (null or an EventTarget object). A tuple is formatted as (item, target). A path is initially the empty list.

Not quite sure what it would require to support this, but if you could give me some pointers, I can attempt an implementation.

Is there any other API jsdom provides that would help determine the path an event is bubbling through?

[amsul]

Okay, for anyone wondering, this seems to be a decent enough workaround for now:

function getEventPath(event) {

  if (event.path) {
    return event.path
  }

  let path = []
  let target = event.target

  while (target.parentNode) {
    path.push(target)
    target = target.parentNode
  }

  path.push(document, window)

  return path

}

@domenic feel free to close this as it is beyond the scope of jsdom atm.

[tomalec]

Just to update, it seems latest Chrome supports composedPath http://jsbin.com/vepohu/3/edit?html,console,output