Add typing to URL

.coveragerc

@@ -10,7 +10,7 @@ source =
   */Lib/site-packages/yarl
 
 [report]
-fail_under = 98.97
+fail_under = 98.95
 skip_covered = true
 skip_empty = true
 show_missing = true

CHANGES/1084.contrib.rst

@@ -0,0 +1 @@
+Covered the :class:`~yarl.URL` object with types -- by :user:`bdraco`.

CHANGES/1084.feature.rst

@@ -0,0 +1 @@
+1084.contrib.rst

tests/test_url.py

@@ -9,7 +9,7 @@
 def test_inheritance():
     with pytest.raises(TypeError) as ctx:
 
-        class MyURL(URL):  # type: ignore[misc]
+        class MyURL(URL):
             pass
 
     assert (

yarl/_helpers.py

@@ -1,5 +1,6 @@
 import os
 import sys
+from typing import TYPE_CHECKING
 
 __all__ = ("cached_property",)
 
@@ -10,7 +11,11 @@
 
 
 # isort: off
-if not NO_EXTENSIONS:  # pragma: no branch
+if TYPE_CHECKING:
+    from ._helpers_py import cached_property as cached_property_py
+
+    cached_property = cached_property_py
+elif not NO_EXTENSIONS:  # pragma: no branch
     try:
         from ._helpers_c import cached_property as cached_property_c  # type: ignore[attr-defined, unused-ignore] # noqa: E501
 

yarl/_quoting_c.pyi

@@ -9,10 +9,10 @@ class _Quoter:
         qs: bool = ...,
         requote: bool = ...
     ) -> None: ...
-    def __call__(self, val: Optional[str] = ...) -> Optional[str]: ...
+    def __call__(self, val: str = ...) -> str: ...
 
 class _Unquoter:
     def __init__(
         self, *, ignore: str = ..., unsafe: str = ..., qs: bool = ...
     ) -> None: ...
-    def __call__(self, val: Optional[str] = ...) -> Optional[str]: ...
+    def __call__(self, val: str = ...) -> str: ...

yarl/_quoting_py.py

@@ -1,7 +1,7 @@
 import codecs
 import re
 from string import ascii_letters, ascii_lowercase, digits
-from typing import Optional, cast
+from typing import cast
 
 BASCII_LOWERCASE = ascii_lowercase.encode("ascii")
 BPCT_ALLOWED = {f"%{i:02X}".encode("ascii") for i in range(256)}
@@ -33,7 +33,7 @@ def __init__(
         self._qs = qs
         self._requote = requote
 
-    def __call__(self, val: Optional[str]) -> Optional[str]:
+    def __call__(self, val: str) -> str:
         if val is None:
             return None
         if not isinstance(val, str):
@@ -123,7 +123,7 @@ def __init__(self, *, ignore: str = "", unsafe: str = "", qs: bool = False) -> N
         self._quoter = _Quoter()
         self._qs_quoter = _Quoter(qs=True)
 
-    def __call__(self, val: Optional[str]) -> Optional[str]:
+    def __call__(self, val: str) -> str:
         if val is None:
             return None
         if not isinstance(val, str):