Readonly Wat

components.input-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  foo: true,
  bar: false
});

templates.application.hbs

{{input-component readOnly=true disabled=true}}
{{input-component readOnly=true disabled=false}}
{{input-component readOnly=false disabled=true}}
{{input-component readOnly=false disabled=false}}

templates.components.input-component.hbs

<input readonly={{readOnly}} disabled={{disabled}} />

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}