Error

rsvp.js:23 Uncaught TypeError: selfthis.redirectTo is not a function
    at marcas-form.js:14
    at tryCatcher (rsvp.js:335)
    at invokeCallback (rsvp.js:506)
    at publish (rsvp.js:492)
    at rsvp.js:16
    at invoke (backburner.js:335)
    at Queue.flush (backburner.js:226)
    at DeferredActionQueues.flush (backburner.js:423)
    at Backburner._end (backburner.js:957)
    at Backburner.end (backburner.js:707)

marcas-form.js

app/components/marcas/marcas-form.js
import Component from '@glimmer/component';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class MarcasFormComponent extends Component{
  @tracked redirectTo;
  //https://guides.emberjs.com/v3.3.0/components/triggering-changes-with-actions/
  //https://github.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/closure-actions.md

  @action
  saveMarca(marca) {
    let selfthis = this;
    marca.save().then( function() {
      selfthis.redirectTo();
    });
  }
}

new.hbs

app/templates/marcas/new.hbs
<h2>Criar nova marca</h2>
{{!-- https://github.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/closure-actions.md --}}

<Marcas::MarcasForm @model={{model}} @redirectTo={{action "redirectTo"}} />

new.js

app/controllers/marcas/new.js
import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class MarcasNewController extends Controller {
  @action
  redirectTo() {
    this.transitionToRoute("/marcas");
  }
}