Unexpected bug with Evented trigger

@dandan wrote:

I’m having troubles with Evented throwing an odd bug when used with a Promise.

I’ve made a simple service to subscribe to events in my components. It just extends Evented, so we can trigger and listen to events.

import Service from "@ember/service";
import Evented from "@ember/object/evented";
export default Service.extend(Evented);

When used with the following:

return new RSVP.Promise(resolve => {
    service.trigger("transitionStart");
    resolve();
  })

I get the following error:

 Cannot read property 'apply' of undefined
    at sendEvent (vendor.js:20489)
    ... which is: method.apply(target, params);
    at Class.trigger (vendor.js:32860)

Even if I rewrite the Service to be more explicit, I get the same error:

export default Service.extend(Evented, {
  transitionStart: function() {
    this.trigger("transitionStart");
  },
  transitionEnd: function() {
    this.trigger("transitionEnd");
  },
  init() {
    this._super(...arguments);
    this.on("transitionStart", function() {
      //for testing, listen to the event here
      console.log("we received the transition Start event");
    });
  }
});

and call it via:

return new RSVP.Promise(resolve => {
    service.transitionStart();
    resolve();
  })

Why isn’t sendEvent working for me in this context?

trigger(name, ...args) {
    sendEvent(this, name, args);
  },

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