Interface IEventHandler<T>

Declare an event as a property in your class like this

public class MyCLass {
    public EventHandler<string> someEvent = new EventHandler<string>();
}

Subscribe to the event like this

const myClass = new MyClass();
myClass.subscribe((event) => {
   console.log(event);
});

Publish an event like this

const myClass = new MyClass();
myClass.raiseEvent("Hi there!");