Properties missing from `APP` property of `application-name/config/environment`

Say this is my application-name/config/environment

/* jshint node: true */

module.exports = function(environment) {
  var ENV = {
    modulePrefix: 'app-name',
    environment: environment,
    rootURL: '/',
    locationType: 'auto',

    pageTitle: {
      separator: ' - ',
      // we want to append the nested title as suffix
      prepend: false,
      // replace completely replaces the outer title we don't want that
      replace: false,
    },

    EmberENV: {
      FEATURES: {
        // Here you can enable experimental features on an ember canary build
        // e.g. 'with-controller': true
      },
      EXTEND_PROTOTYPES: {
        // Prevent Ember Data from overriding Date.parse.
        Date: false
      }
    },

    APP: {
      // Here you can pass flags/options to your application instance
      // when it is created
    },

    i18n: {
      defaultLocale: 'en',
    },
  };

  if (environment === 'test') {
    // Testem prefers this...
    ENV.locationType = 'none';

    // keep test console output quieter
    ENV.APP.LOG_ACTIVE_GENERATION = false;
    ENV.APP.LOG_VIEW_LOOKUPS = false;

    ENV.APP.rootElement = '#ember-testing';
    ENV.APP.API_HOST = 'http://ift.tt/2o1uYLi';
  }
  else if (environment === 'production') {

  }
  else {
    ENV.APP.API_HOST = 'http://ift.tt/2o1uYLi';
  }

  return ENV;
};

It's pretty much the default generated one, except there is an API_HOST in the APP sub property in dev & test mode.

Say in a random module I do this

import ENV from 'application-name/config/environment';
console.log(ENV.APP.API_HOST); 

What I expect is the value put in .APP.API_HOST to logged, except I see undefined... If I log ENV.APP this is what i see

note the application name has been removed.

However checking the global object works?

console.log(ApplicationName.API_HOST);

Now I do not want to access the global object, because it's kinda hacky. It's 2017 and we have es modules now...

What I've tried

1. made sure I used the right environment, we haven't tried prod yet, because we don't have a prod build...
2. This specific plugin, only to get the same result
3. I did ask this question on the help channel on the Ember slack, but I didn't quite have that much success there :/