00472-hard-tuple-to-enum-object.ts

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

const OperatingSystem = ['macOS', 'Windows', 'Linux'] as const
const Command = ['echo', 'grep', 'sed', 'awk', 'cut', 'uniq', 'head', 'tail', 'xargs', 'shift'] as const

type cases = [
  Expect<Equal<Enum<[]>, {}>>,
  Expect<Equal<
  Enum<typeof OperatingSystem>,
  {
    readonly MacOS: 'macOS'
    readonly Windows: 'Windows'
    readonly Linux: 'Linux'
  }
  >>,
  Expect<Equal<
  Enum<typeof OperatingSystem, true>,
  {
    readonly MacOS: 0
    readonly Windows: 1
    readonly Linux: 2
  }
  >>,
  Expect<Equal<
  Enum<typeof Command>,
  {
    readonly Echo: 'echo'
    readonly Grep: 'grep'
    readonly Sed: 'sed'
    readonly Awk: 'awk'
    readonly Cut: 'cut'
    readonly Uniq: 'uniq'
    readonly Head: 'head'
    readonly Tail: 'tail'
    readonly Xargs: 'xargs'
    readonly Shift: 'shift'
  }
  >>,
  Expect<Equal<
  Enum<typeof Command, true>,
  {
    readonly Echo: 0
    readonly Grep: 1
    readonly Sed: 2
    readonly Awk: 3
    readonly Cut: 4
    readonly Uniq: 5
    readonly Head: 6
    readonly Tail: 7
    readonly Xargs: 8
    readonly Shift: 9
  }
  >>,
]

/******************************************************************************
* Answer
******************************************************************************/

type Enum<T extends readonly string[], N extends boolean = false> = any