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

Using create-react-app v3.3 I found the easiest way to achieve this was to extend the Window type in the auto-generated react-app-env.d.ts:

interface Window {
    MyNamespace: any;
}