reopen()

components.base-table.js

import Ember from 'ember';

const { computed } = Ember;

export default Ember.Component.extend({
  value: computed(function() {
    return 'BASE';
  })
});

components.derived-table.js

import Ember from 'ember';
import BaseTable from './base-table';

const { computed } = Ember;

BaseTable.reopen({
  value: computed(function() {
    return 'DERIVED';
  })
});

export default BaseTable;

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

Base: {{base-table}}
Derived: {{derived-table}}
Base: {{base-table}}

{{outlet}}
<br>
<br>

templates.components.base-table.hbs

{{value}}

templates.components.derived-table.hbs

{{value}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}