NativeScript/tests/app/ui/bindingContext_testPage1.ts

import * as observable from "tns-core-modules/data/observable";
import * as pageModule from "tns-core-modules/ui/page";

function loadViewModel() {
    viewModel.set("testProperty", "Alabala");
}

var viewModel = new observable.Observable();

loadViewModel();

export function pageLoaded(args: observable.EventData) {
    var page = <pageModule.Page>args.object;
    page.bindingContext = viewModel;
}