This optionally exposes the developer to some global utility functions on google chrome dev console: routes(), route(), model(), service('$serviceName') etc.

devtools.js

import Service from '@ember/service';
import ENV from 'frontend/config/environment';
import { getOwner } from '@ember/application';

export default class DevToolService extends Service {
  owner = getOwner(this);

  constructor() {
    super(...arguments);

    if (ENV.devTools && ENV.devTools.global) {
      window.devTools = this;

      const self = this;

      ['route', 'controller', 'model', 'service', 'router', 'routes', 'currentRouteName', 'lookup']
        .forEach((property) => {
          window[property] = function () {
            return self[property].apply(self, arguments);
          }
        });
    }
  }

  app(name = 'main') {
    return this.lookup(`application:${name}`);
  }

  route(param) {
    return this.lookup(`route:${param || this.currentRouteName()}`);
  }

  controller(param) {
    return this.lookup(`controller:${param || this.currentRouteName()}`);
  }

  model(name) {
    const controller = this.controller(name);

    return controller && controller.get('model');
  }

  service(name) {
    return this.lookup(`service:${name}`);
  }

  router() {
    return this.lookup('service:router');
  }

  routes() {
    return Object.keys(this.router()._router._routerMicrolib.recognizer.names);
  }

  currentRouteName() {
    return this.service('router').currentRouteName;
  }

  lookup(name) {
    return this.owner.lookup(name);
  }
}