00015-medium-last.ts

// ============= Test Cases =============
import type { Equal, Expect } from './test-utils'

type cases = [
  Expect<Equal<Last<[3, 2, 1]>, 1>>,
  Expect<Equal<Last<[() => 123, { a: string }]>, { a: string }>>,
]


// ============= Your Code Here =============
type Last<T extends any[]> = T extends [infer Head, ...infer Tail] ?
  (
    Tail extends [] ? Head
    : Last<Tail>
  ) : never