小编Aml*_*lau的帖子

export type MyTuple = ["test", "othertest"];

type NotWorking = {
    [K in keyof MyTuple]: { value: MyTuple[K]};
};

type NotWorkingLengthType = NotWorking["length"]; // { value: 2 }

type Working<T>= {
    [P in keyof T]: { value: T[P] };
};

type MappedWorking = Working<MyTuple>;
type MappedWorkingLengthType = MappedWorking["length"]; // 2

为什么在这种情况下它的行为有所不同？这让我很困惑。