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String to Union

提出詳細

type StringToUnion<T extends string, C extends readonly string[] = []> = T extends `${infer F}${infer Tail}` ?
  StringToUnion<Tail, [...C, F]>:
  C[number]

提出日時	2022-06-27 23:22:32
問題	String to Union
ユーザー	waki285
ステータス	Accepted

テストケース

import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<StringToUnion<''>, never>>,
  Expect<Equal<StringToUnion<'t'>, 't'>>,
  Expect<Equal<StringToUnion<'hello'>, 'h' | 'e' | 'l' | 'l' | 'o'>>,
  Expect<Equal<StringToUnion<'coronavirus'>, 'c' | 'o' | 'r' | 'o' | 'n' | 'a' | 'v' | 'i' | 'r' | 'u' | 's'>>,
]