Obscure deprecation warning

If i use `new WebSocket` (hxnodejs-ws) that depends on `Url` (from hxnodejs), i get deprecation warning about `Url` function that is not used, but has deprecated typedef in overload. There is no information how that `Url.format` is called from user code.
```haxe
import haxe.extern.EitherType;

class Main {
static function main() {
final ws = new WebSocket("");
}
}

class WebSocket {
public function new(address:EitherType) {};
}

class Url {
// (WDeprecated) This typedef is deprecated in favor of { }
@:overload(function(urlObject:UrlObject):String {})
static function format(url:String):String {
return "";
}
}

@:deprecated
typedef UrlObject = {};
```

Start with the minimal Haxe reproduction in the issue and confirm when `new WebSocket("")` triggers the deprecation warning through the `EitherType` overload. Trace how the `Url.format` overload and deprecated `UrlObject` typedef are analyzed, then verify the warning no longer reports an unused or indirectly referenced deprecation incorrectly.

Written by the indexing model from the issue text.