ember-cli-typescript with Route mixins

route-bad1.ts

// Almost works, but it still complains about a few missing properties with this approach
export default class ProtectedRoute extends Ember.Route.extend(AuthenticatedRouteMixin) {
    public actions: null;
    public activate: null;
    public afterModel: null;
    public beforeModel: null;
    public controller: null;
    public controllerFor: null;
    public controllerName: null;
    public deactivate: null;
    public didTransition: null;
    public disconnectOutlet: null;
    public error: null;
    public get: null;
    public getProperties: null;
    public has: null;
    public loading: null;
    public model: null;
    public modelFor: null;
    public notifyPropertyChange: null;
    public off: null;
    public on: null;
    public one: null;
    public paramsFor: null;
    public queryParams: null;
    public redirect: null;
    public refresh: null;
    public render: null;
    public renderTemplate: null;
    public replaceWith: null;
    public resetController: null;
    public routeName: null;
    public send: null;
    public serialize: null;
    public set: null;
    public setProperties: null;
    public setupController: null;
    public store: null;
    public templateName: null;
    public transitionTo: null;
    public trigger: null;
    public willTransition: null;
}

route-bad2.ts

// Works, but no mixin. :/
export default class ProtectedRoute extends Ember.Route.extend() {
}