JSFiddle - React, Tailwind, and code Playground

JavaScript

var cls = new Class({
    Implements: [Events],
    doSomething: function() {
        this.fireEvent('complete', ['aa', 'bb ']);
    }
});

var ins = new cls();
ins.addEvent('complete', function(a, b) {
    console.log(a, b);
});

ins.doSomething();