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4260 - AllCombinations #18249

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CaoXueLiang opened this issue Oct 29, 2022 · 0 comments

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CaoXueLiang commented Oct 29, 2022

// 将字符串转化为`Union`类型
type StringToUnion<S extends string> = S extends `${infer F}${infer R}`
  ? F | StringToUnion<R>
  : "";

type Combinations<T extends string, U = T> = U extends T
  ? U | `${U}${Combinations<Exclude<T, U>>}`
  : never;
type AllCombinations<S extends string> = Combinations<StringToUnion<S>>;

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