feat: return type predicate

[privatenumber]

I read this blogpost by @ddprrt that offered a solution to making a custom hasOwnProperty that returns a type predicate:

function hasOwnProperty<X extends {}, Y extends PropertyKey>
  (obj: X, prop: Y): obj is X & Record<Y, unknown> {
  return obj.hasOwnProperty(prop)
}

The type will diverge from TypeScript's native hasOwnProperty type, but what do you think of this enhancement?

[sindresorhus]

👍 PR welcome.

[ddprrt]

Cool! 👏