Here is my sample code:

    const AUSTRIA = ['Vienna', 'Raiding'] as const;
    const testCountries = { Austria: AUSTRIA } as const;

    type CountryType = typeof testCountries;
    type CountryStateType<T extends CountryType> = [keyof T, T[keyof T][number]];
    const countryAndState: CountryStateType<CountryType> = ['Austria', 'Raiding'];

This is working, and this is the expected behavior for countryAndState[1] referencing the CountryStateType:

Here is the image: TypeScriptLintError Image

    const StateBasedOnCountry: CountryType['Austria'][number] = 'Raiding';