I want to set up a custom event class in javascript. How can that be done in Unity?

Can someone please point me to some documentation or examples of implementing custom event classes in Unity. Basically I want classes that are instantiated by other classes to be able to communicate to their parents even if they are not attached to a game object. I have seen some examples of C# but can someone help me with a javascript implementation. Just custom events that classes can register to and parameters passed with the event.