Add WebOb urljoin

Author: jackwalkerlabs

stubs/WebOb/@tests/test_cases/check_util.py

@@ -0,0 +1,8 @@
+from typing_extensions import assert_type
+
+from webob.util import urljoin
+
+assert_type(urljoin("https://example.com/a/", "b"), str)
+assert_type(urljoin("https://example.com/a/", None), str)
+assert_type(urljoin(None, "b"), str)
+assert_type(urljoin(None, None), None)

stubs/WebOb/webob/util.pyi

@@ -1,7 +1,15 @@
 from collections.abc import Callable
-from typing import AnyStr
+from typing import AnyStr, overload
 
 def html_escape(s: object) -> str: ...
+
+@overload
+def urljoin(base: str, url: str | None) -> str: ...
+@overload
+def urljoin(base: None, url: str) -> str: ...
+@overload
+def urljoin(base: None, url: None) -> None: ...
+
 def header_docstring(header: str, rfc_section: str) -> str: ...
 def warn_deprecation(text: str, version: str, stacklevel: int) -> None: ...