would be nice: Ember.computed

[stefanpenner]

in the future we will want to import this from ember it would be nice if we then also added support for this to watson.

for example:

import computed from 'ember/computed';

@rwjblue do you remember which module computed came from, I don't remember where the spreadsheet has gone.

We can also emulate this, by updating: https://github.com/ember-cli/ember-cli-shims accordingly