javascript - Ember.js mixin/object internals -

i'm trying build little extension ember have been set though helper function, computed/observer/on. far understand, helper function adds property function object: https://github.com/emberjs/ember.js/blob/2fefde66fd7a06bf1f0121c1e1bcdbb6ddbe455e/packages/ember-metal/lib/events.js#l304-l309

the question how find property on mixin initialization. related logic in mixin prototype looks pretty complicated , can't understand how retrieve properties , check if __ember_listens/observes__ set stuff right properties.

some easy (and efficient) way enumerate through properties of object?