If an API expects the outside world to hand it an instance of a specific library, all bets are off. Maybe it gets `null` or the `window` object, who knows? But

If an API expects the outside world to hand it an instance of a specific library, all bets are off. Maybe it gets `null` or the `window` object, who knows? But a library can at least declare what dependencies it wants. If you take that away, it ratchets up the uncertainty factor that much more.