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13580 - Replace Union #22543

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teamchong opened this issue Jan 26, 2023 · 0 comments

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13580 answer en

teamchong commented Jan 26, 2023 •

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type UnionReplace<T, U extends [unknown, unknown][]> = 
  U extends [[infer Subject, infer Replacement], ...infer Rest extends [unknown, unknown][]] ? (
    UnionReplace<
      (T extends Subject ? never : T) |           // remove Subject
      (Subject extends T ? Replacement : never),  // add Replacement
      Rest
    >
  ) : T

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