A union-like type with a large amount of items in TypeScript?

Question

Is it possible to define in an interface that a variable can only equal to a string from an array of strings, when an array is quite large and using union types don't seem to be feasible?

I have a list of country codes like ['US','GB','CY', 'PL'] and so on, about 200 in total.

Is it possible to do it something like

interface ICountryInfo {
    countryCode: CountryCodes;
}

Where CountryCodes is an array of codes?

Answer 1

You can use enume type to defines CountryCodes.

enum CountryCodes{
    US,
    GB,
    CY,
    PL
}

interface ICountryInfo {
    countryCode: CountryCodes;
}