type-challenges-judge

Type Challenges Judge

Problems

Progress

Tuple to Nested Object

提出詳細

type TupleToNestedObject<T extends readonly unknown[], U> = T extends [infer Head extends PropertyKey, ...infer Rest] ?
  {[P in Head]: TupleToNestedObject<Rest, U> } : U

提出日時	2025-09-16 15:43:35
問題	Tuple to Nested Object
ユーザー	balckowl
ステータス	Accepted

テストケース

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

type cases = [
  Expect<Equal<TupleToNestedObject<['a'], string>, { a: string }>>,
  Expect<Equal<TupleToNestedObject<['a', 'b'], number>, { a: { b: number } }>>,
  Expect<Equal<TupleToNestedObject<['a', 'b', 'c'], boolean>, { a: { b: { c: boolean } } }>>,
  Expect<Equal<TupleToNestedObject<[], boolean>, boolean>>,
]