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application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

application.template.hbs

<span style='background-color: yellow;'>Page 1 is a normal route, linking to it works fine. Page 2 does a `transition.abort()` after a 1 second delay. Notice how the `ember-transitioning-in` class isn't removed correctly.</span>

<hr />

<style>
 .active { color: green; }
 .ember-transitioning-in { color: red; }
 .ember-transitioning-out { color: black; }
</style>


[{{#link-to 'index'}}Home{{/link-to}}]
[{{#link-to 'page1'}}Page 1{{/link-to}}]
[{{#link-to 'page2'}}Page 2{{/link-to}}]

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('page1');
  this.route('page2');
});

export default Router;

routes.page2.js

import Ember from 'ember';

var delay = function(milliseconds) {
  return new Ember.RSVP.Promise(function(resolve) {
    Ember.run.later(this, resolve, milliseconds);
  });
};

export default Ember.Route.extend({
  beforeModel: function(transition) {
    return delay(1000).then(function() {
      transition.abort();   
    });
  }
});

routes.route.js

import Ember from 'ember';

export default Ember.Route.extend({
});

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}