From @hshristov on March 11, 2015 13:44

The purpose of this is to collect most commonly used UI modules into one module, so that they are "required" more easily. For example:

import ui = require("ui"); 

var btn = new ui.Button();
var lbl = new ui.Label();
var stack = new ui.StackPanel();
stack.orientation = ui.Orientation.horizontal;

Copied from original issue: NativeScript/cross-platform-modules#164