Emitter

A modern event emitter implementation.

Emitter.js is an event emitter based on the nodejs EventEmitter but utilizing some of the new features in ECMAScript 6.

Installation

Git

git clone https://github.com/jeffrose/emitter emitter

NPM

npm install emitter-js

Bower

bower install emitter-js

Documentation

• API
• CHANGES
• ROADMAP
• UPGRADE

Usage

Emitter.js provides both an ES5 and ES6 version as part of the distribution.

Additional examples can be found in the API docs and unit tests.

ECMAScript 6

// Depending on the scenario the /index may not be necessary
import Emitter from '../node_modules/emitter-js/dist/emitter';

let greeter = new Emitter();

greeter.on( 'hello', ( name ) => console.log( `Hello, ${ name }!` ) );
greeter.emit( 'hello', 'World' );
// Hello, World!

ECMAScript 5

var Emitter = require( 'emitter-js' ),

    greeter = new Emitter();

greeter.on( 'hello', function( name ){
    console.log( 'Hello, ' + name + '!' ) );
} );
greeter.emit( 'hello', 'World' );
// Hello, World!

Differences from EventEmitter

Emitter.js...

• Lacks domain support.
• Has a succint API with no backward compatibility aliases, e.g. clear() instead of removeAllListeners().
• Has namespaced lifecycle event types, e.g. :off instead of removeListener.
• Does not use console.log().