TYP: hardcode self._uri_reference s type for mypy

httpx/_urls.py

@@ -6,7 +6,7 @@
 import idna
 
 from ._types import QueryParamTypes
-from ._urlparse import urlparse
+from ._urlparse import ParseResult, urlparse
 from ._utils import primitive_value_to_str
 
 __all__ = ["URL", "QueryParams"]
@@ -113,6 +113,7 @@ def __init__(self, url: URL | str | typing.Any = "", **kwargs: typing.Any) -> No
                 params = kwargs.pop("params")
                 kwargs["query"] = None if not params else str(QueryParams(params))
 
+        self._uri_reference: ParseResult
         if isinstance(url, URL):
             self._uri_reference = url._uri_reference.copy_with(**kwargs)
         else: