messagebus.js

function MessageBus() {
    var self = this;
    var subscribable = new ko.subscribable();
    self.publish = function (bus, message) {
        subscribable.notifySubscribers(message, bus);
    };
    self.subscribe = function (bus, callback, callbackTarget) {
        subscribable.subscribe(function (message) {
            callback(ko.toJS(message));
        }, callbackTarget || this, bus);
    };
}

//how to use it?
var mb = new MessageBus();
mb.publish('way2.message-name', {
    prop1: 'value1'
});
mb.subscribe('way2.message-name', function (message) {
    console.log(message.prop1);
});