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

Create a file called global.d.ts e.g /src/@types/global.d.ts then define an interface like:

interface Window {
  myLib: any
}

ref: https://www.typescriptlang.org/docs/handbook/declaration-files/templates/global-d-ts.html