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25747 - IsNegativeNumber #26851

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Hfutsora opened this issue Apr 26, 2023 · 0 comments

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25747 answer en

Hfutsora commented Apr 26, 2023 •

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type IsUnion<T, U extends T = T> =
  (T extends any ?
    (U extends T ? false : true)
    : never) extends false ? false : true

type IsNegativeNumber<T extends number> = IsUnion<T> extends true 
  ? never 
  : number extends T 
    ? never 
    : `${T}` extends `-${string}` 
      ? true 
      : false

Hfutsora added answer en labels

github-actions bot added the 25747 label

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