_clientShouldEmit = function(event) {
    if (!(event && event.type)) {
      return false;
    }
    if (event.client && event.client !== this) {
      return false;
    }
    var meta = _clientMeta[this.id];
    var clippedEls = meta && meta.elements;
    var hasClippedEls = !!clippedEls && clippedEls.length > 0;
    var goodTarget = !event.target || hasClippedEls && clippedEls.indexOf(event.target) !== -1;
    var goodRelTarget = event.relatedTarget && hasClippedEls && clippedEls.indexOf(event.relatedTarget) !== -1;
    var goodClient = event.client && event.client === this;
    if (!meta || !(goodTarget || goodRelTarget || goodClient)) {
      return false;
    }
    return true;
  }
Inspect an Event to see if the Client (`this`) should honor it for emission.
@private