ember-cli-babel/lib/find-app.js

Ember CLI addon for Babel

'use strict';

module.exports = function findApp(addon) {
  let current = addon;
  let app;

  // Keep iterating upward until we don't have a grandparent.
  // Has to do this grandparent check because at some point we hit the project.
  do {
    app = current.app || app;
  } while (current.parent.parent && (current = current.parent));

  return app;
}