merge enum typescript
enum Mammals {
    Humans = 'Humans',
    Bats = 'Bats',
    Dolphins = 'Dolphins',
}
enum Reptiles {
  Snakes = 'Snakes',
  Alligators = 'Alligators',
  Lizards = 'Lizards',
}
const Animals = {
   ...Mammals,
   ...Reptiles,
}
type Animals = Mammals | Reptiles