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Append Argument

提出詳細

type AppendArgument<Fn, A> = Fn extends (...args: infer Args) => infer Ret
  ? (...args: [...Args, A]) => Ret
  : never
提出日時2023-09-09 03:23:27
問題Append Argument
ユーザーsnaka
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type Case1 = AppendArgument<(a: number, b: string) => number, boolean>
type Result1 = (a: number, b: string, x: boolean) => number

type Case2 = AppendArgument<() => void, undefined>
type Result2 = (x: undefined) => void

type cases = [
  Expect<Equal<Case1, Result1>>,
  Expect<Equal<Case2, Result2>>,
]