Nativescript with javascript: Missing app/shared folder

I want to use Telerik Backend Services to hit my backend service, but the app/config folder requires the following module, which is missing.

module.exports = {
    apiUrl: ""

A list of files and folders found in app/config:

app.css  App_Resources  main-page.js   package.json  views(create by me)
app.js   images         main-page.xml

Does anyone have an idea how to fix this?