event-emitter3

event-emitter3 fork of EventEmitter3

EventEmitter3 is a high performance EventEmitter. It has been micro-optimized for various of code paths making this, one of, if not the fastest EventEmitter available for Node.js. The module is API compatible with the EventEmitter that ships by default with Node.js but there are some slight differences:

• Domain support has been removed.
• We do not throw an error when you emit an error event and nobody is listening.
• The newListener event is removed as the use-cases for this functionality are really just edge cases.
• No setMaxListeners and its pointless memory leak warnings. If you want to add end listeners you should be able to do that without modules complaining.
• No listenerCount method. Use EE.listeners(event).length instead.
• The listeners method can do existence checking instead of returning only arrays.
• The removeListener method removes all matching listeners, not only the first.

It's a drop in replacement for existing EventEmitters, but just faster. Free performance, who wouldn't want that? The EventEmitter is written in EcmaScript 3 so it will work in the oldest browsers and node versions that you need to support.

Installation

$ npm install --save event-emitter3

Usage

After installation the only thing you need to do is require the module:

var EventEmitter = require('event-emitter3');

And you're ready to create your own EventEmitter instances. For the API documentation, please follow the official Node.js documentation:

http://nodejs.org/api/events.html

Existence

To check if there is already a listener for a given event you can supply the listeners method with an extra boolean argument. This will transform the output from an array, to a boolean value which indicates if there are listeners in place for the given event:

var EE = new EventEmitter();
EE.once('event-name', function () {});
EE.on('another-event', function () {});
 
EE.listeners('event-name', true); // returns true
EE.listeners('unknown-name', true); // returns false

Tests and benchmarks

This module is well tested. You can run:

• npm test to run the tests under Node.js.

We also have a set of benchmarks to compare EventEmitter3 with some available alternatives. To run the benchmarks run npm run benchmark.

Tests and benchmarks are not included in the npm package. If you want to play with them you have to clone the GitHub repository.

License

MIT