factory.js

// factory-registry.js

export default FactoryRegistry {
  static register(name, klass) {
   this._factories = this._factories || {};
   this._factories[name] = klass;
  }
}

// factory instance

import Factory from './factory-registry.js';

export default FactoryInstance {
  
  build(){
    // DOIT 
  }
   
}

// The problem, in dev this gets invoked, but in production
// it doesn't, is this an ember-cli build optimization to lazily evaluate
// classes?
FactoryRegistry.register('factoryInstance', FactoryInstance)