Answer by milgner for how to use WinRT C# Singleton in Javascript

Language projection will slightly change the name of properties to conform to the patterns used in the consuming language. So when you define a property MyClass::Instance in C#, you should have MyClass.instance (lowercase 'i') in JavaScript.

Also, you can browse the available functions and properties in the JavaScript debugger (using Shift+F9 and entering "MyClass" for example is one way).