KeyOf

Same as keyof, but works with unions.

import { KeyOf } from 'crustack/types'

type MyObject =
  | {
      a: number
      b: string
    }
  | {
      b: string
      c?: boolean
    }

type T = KeyOf<MyObject>
// 'a' | 'b' | 'c'

type U = keyof MyObject
// 'b'