EventEmitter (es4x 0.19.0 API)

All Known Implementing Classes:

EventEmitterImpl, Runtime
```
public interface EventEmitter
```
Simple EventEmitter

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`emit(String eventName, Object... args)`	Will trigger the event callback if any on the given event.
`void`	`on(String eventName, org.graalvm.polyglot.Value callback)`	Register a callback for an event.

- Method Detail
  - on
```
void on(String eventName,
        org.graalvm.polyglot.Value callback)
```
    Register a callback for an event.
    
    Parameters:
    
    eventName - the event name
    
    callback - the action to perform
  - emit
```
int emit(String eventName,
         Object... args)
```
    Will trigger the event callback if any on the given event.
    
    Parameters:
    
    eventName - the event.
    
    args - arguments to be passed
    
    Returns:
    
    callback arity