EventEmitter3 focuses on performance while maintaining a Node.js AND browser compatible interface.
EventEmitter3 is a faster alternative to EventEmitter2 and the built-in EventEmitter that ships within Node.js. It removes some features that you might not need:
- Domain support.
- Thrown errors when there are no error listeners specified.
- That a
newListenerevent is emitted when an event is emitted.
- No silly
setMaxListeners, the function exists, but does nothing.
- No silly
listenerCountfunction.. Just do
And adds some features you want:
- Emit events with a custom context without binding:
EE.on(event, fn, context)which also works with once
EE.once(event, fn, context)
It's a drop in replacement of your existing EventEmitters, but just faster. Free performance, who wouldn't want that?
The source of the EventEmitter is compatible for browser usage, no fancy pancy
work IE5 if you want to.
$ npm install --save eventemitter3
or as a component
$ component install eventemitter3
var EventEmitter = require'eventemitter3';// orvar EventEmitter = require'eventemitter3'EventEmitter;
For API methods see the official Node.js documentation: