It's not so hard to do this with conditional types now in TypeScript 4.1!
type TupleOf<T, Length extends number> = number extends Length ? T[] : TupleOfHelper<[], T, Length> type TupleOfHelper<Arr extends unknown[], T, Length extends number> = Arr["length"] extends Length ? Arr : TupleOfHelper<[T, ...Arr], T, Length>; type Yadda = TupleOf<string, 2>
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It's not so hard to do this with conditional types now in TypeScript 4.1!