Extending global types (e.g. “Window”) inside a typescript module

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Yes, you just need to wrap the interface into global declaration:

declare global {
    interface Window {
        myCounter: number;
    }
}

Global scope can be augmented from modules using a declare global declarations

More info here

** Make sure the file is treated as a module (has import or export statement, if not – you can add empty export {})

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