micro-events

A very, very simple event emitter implementation.

Features

• no dependencies
• very small (~ 80 LoC)
• smart memory leak detection
• lighting fast
• unopinionated and minimal
• works in the browser and on Node.JS
• checks arguments
• emits useful events

How can I use this?

    var EventEmitter = require('micro-events');
    var myEventEmitter = new EventEmitter();

    // Maximum number of listeners (used to prevent memory leaks and dumb code)
    // - defaults to 10
    myEventEmitter.maxListeners = 20;

    // Implement listener
    var onRun = function (explosion) {
        console.log(explosion);
    };

    // Register onRun event listener
    myEventEmitter.on('explosion', onRun);

    setTimeout(function () {
        // Deregister event listener after 5 seconds
        myEventEmitter.off('explosion', onRun);
    }, 5000);

    setInterval(function () {
        if (Math.random() < 0.1) {
            // Emit explosion event
            myEventEmitter.emit('explosion', {
                t: new Date().getTime()
            });
        } else {
            // Emit noExplosion event
            myEventEmitter.emit('noExplosion', {
                t: new Date().getTime()
            });
        }
    }, 100);

How can I extend this?

Just like you would extend any other "class".

    var EventEmitter = require('micro-events');

    var MyEventEmitter = function () {
        EventEmitter.call(this);
    };

    MyEventEmitter.prototype = Object.create(EventEmitter.prototype);
    MyEventEmitter.prototype.constructor = MyEventEmitter;

If possible, it is recommended to use/ mix in individual methods as opposed to extending the super class.