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59 - Get Optional #24357

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yolilufei opened this issue Mar 1, 2023 · 0 comments

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yolilufei commented Mar 1, 2023

type GetOptional<T extends Record<string, any>> = matchOptionalKey<T, GetKeys<T>>;

type GetKeys<T> = {
  [k in keyof T]: k;
};

type matchOptionalKey<T extends Record<string, any>, U extends Record<string, any>, k = keyof U> = k extends keyof U ? undefined extends U[k] ? {
  [m in k]?: m extends keyof T ? T[m] : never;
} : never : never;

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