How do you explicitly set a new property on `window` in TypeScript?

Question

I setup global namespaces for my objects by explicitly setting a property on window.

window.MyNamespace = window.MyNamespace || {};

Answer 1

The accepted answer is what I used to use, but with TypeScript 0.9.* it no longer works. The new definition of the Window interface seems to completely replace the built-in definition, instead of augmenting it.

I have taken to doing this instead:

interface MyWindow extends Window {
    myFunction(): void;
}

declare var window: MyWindow;

UPDATE: With TypeScript 0.9.5 the accepted answer is working again.