The checked property returns the value of the native element.checked property.

// <input id="foo" value="foo" type="radio"/>
// <input id="bar" value="bar" type="radio" checked/>
new Interactor('#foo').checked //=> false
new Interactor('#bar').checked //=> true

The property creator can be used with custom interactors to reflect the value of a nested element, and to make assertions against.

import interactor, { checked } from 'interactor.js';

@interactor class AgreementInteractor {
  checked = checked('[type="checkbox"]');

// <fieldset id="agreement">
//   <input type="checkbox" checked/>
// </fieldset>

new AgreementInteractor('#agreement').checked //=> true

await new AgreementInteractor('#agreement')