gistfile1.txt

var appModel = function () {
  var self = this;
  this.myVar = ko.observable('kebab');
  this.module = ko.observable(new module(self));
}

var module = function (parent) {
  var self = this;
  this.widget = ko.observable(new widget(self));
}

var widget = function (parent) {
  var self = this;
  this.var = ko.observable(parent.parent.myVar());
  this.var = ko.observable(parent.parent().myVar());
}