Update type annotations

9 files changed, 24 insertions, 17 deletions

diff --git a/sphinx/application.py b/sphinx/application.py
index c4fc9c212..b5cc44268 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -130,6 +130,9 @@ class Sphinx:
     :ivar outdir: Directory for storing build documents.
     """
 
+    warningiserror: bool
+    _warncount: int
+
     def __init__(self, srcdir: str, confdir: Optional[str], outdir: str, doctreedir: str,
                  buildername: str, confoverrides: Dict = None,
                  status: IO = sys.stdout, warning: IO = sys.stderr,
diff --git a/sphinx/deprecation.py b/sphinx/deprecation.py
index 1d602fa82..aeefcc61f 100644
--- a/sphinx/deprecation.py
+++ b/sphinx/deprecation.py
@@ -30,7 +30,7 @@ RemovedInNextVersionWarning = RemovedInSphinx50Warning
 
 
 def deprecated_alias(modname: str, objects: Dict[str, object],
-                     warning: "Type[Warning]", names: Dict[str, str] = None) -> None:
+                     warning: "Type[Warning]", names: Dict[str, str] = {}) -> None:
     module = import_module(modname)
     sys.modules[modname] = _ModuleWrapper(  # type: ignore
         module, modname, objects, warning, names)
diff --git a/sphinx/locale/__init__.py b/sphinx/locale/__init__.py
index bedd9e1cb..28dda2e1a 100644
--- a/sphinx/locale/__init__.py
+++ b/sphinx/locale/__init__.py
@@ -106,7 +106,7 @@ class _TranslationProxy(UserString):
 translators = defaultdict(NullTranslations)  # type: Dict[Tuple[str, str], NullTranslations]
 
 
-def init(locale_dirs: List[Optional[str]], language: str,
+def init(locale_dirs: List[Optional[str]], language: Optional[str],
          catalog: str = 'sphinx', namespace: str = 'general') -> Tuple[NullTranslations, bool]:
     """Look for message catalogs in `locale_dirs` and *ensure* that there is at
     least a NullTranslations catalog set in `translators`. If called multiple
@@ -123,9 +123,11 @@ def init(locale_dirs: List[Optional[str]], language: str,
 
     if language and '_' in language:
         # for language having country code (like "de_AT")
-        languages = [language, language.split('_')[0]]
-    else:
+        languages = [language, language.split('_')[0]]  # type: Optional[List[str]]
+    elif language:
         languages = [language]
+    else:
+        languages = None
 
     # loading
     for dir_ in locale_dirs:
diff --git a/sphinx/pycode/ast.py b/sphinx/pycode/ast.py
index b9fbfc83d..e4e773b25 100644
--- a/sphinx/pycode/ast.py
+++ b/sphinx/pycode/ast.py
@@ -108,7 +108,7 @@ class _UnparseVisitor(ast.NodeVisitor):
         return name
 
     def visit_arguments(self, node: ast.arguments) -> str:
-        defaults = list(node.defaults)
+        defaults = list(node.defaults)  # type: List[Optional[ast.expr]]
         positionals = len(node.args)
         posonlyargs = 0
         if hasattr(node, "posonlyargs"):  # for py38+
@@ -117,7 +117,7 @@ class _UnparseVisitor(ast.NodeVisitor):
         for _ in range(len(defaults), positionals):
             defaults.insert(0, None)
 
-        kw_defaults = list(node.kw_defaults)
+        kw_defaults = list(node.kw_defaults)  # type: List[Optional[ast.expr]]
         for _ in range(len(kw_defaults), len(node.kwonlyargs)):
             kw_defaults.insert(0, None)
 
diff --git a/sphinx/util/i18n.py b/sphinx/util/i18n.py
index 3a5aca58e..d647d6d05 100644
--- a/sphinx/util/i18n.py
+++ b/sphinx/util/i18n.py
@@ -12,7 +12,7 @@ import os
 import re
 from datetime import datetime, timezone
 from os import path
-from typing import TYPE_CHECKING, Callable, Generator, List, NamedTuple, Tuple, Union
+from typing import TYPE_CHECKING, Callable, Generator, List, NamedTuple, Optional, Tuple, Union
 
 import babel.dates
 from babel.messages.mofile import write_mo
@@ -170,7 +170,7 @@ date_format_mappings = {
 date_format_re = re.compile('(%s)' % '|'.join(date_format_mappings))
 
 
-def babel_format_date(date: datetime, format: str, locale: str,
+def babel_format_date(date: datetime, format: str, locale: Optional[str],
                       formatter: Callable = babel.dates.format_date) -> str:
     if locale is None:
         locale = 'en'
@@ -191,7 +191,7 @@ def babel_format_date(date: datetime, format: str, locale: str,
         return format
 
 
-def format_date(format: str, date: datetime = None, language: str = None) -> str:
+def format_date(format: str, date: datetime = None, language: Optional[str] = None) -> str:
     if date is None:
         # If time is not specified, try to use $SOURCE_DATE_EPOCH variable
         # See https://wiki.debian.org/ReproducibleBuilds/TimestampsProposal
diff --git a/sphinx/util/images.py b/sphinx/util/images.py
index 8c32e3414..a2a31f55b 100644
--- a/sphinx/util/images.py
+++ b/sphinx/util/images.py
@@ -12,7 +12,7 @@ import base64
 import imghdr
 from collections import OrderedDict
 from os import path
-from typing import IO, NamedTuple, Optional, Tuple
+from typing import IO, BinaryIO, NamedTuple, Optional, Tuple
 
 import imagesize
 
@@ -103,7 +103,7 @@ def parse_data_uri(uri: str) -> Optional[DataURI]:
     return DataURI(mimetype, charset, image_data)
 
 
-def test_svg(h: bytes, f: IO) -> Optional[str]:
+def test_svg(h: bytes, f: Optional[BinaryIO]) -> Optional[str]:
     """An additional imghdr library helper; test the header is SVG's or not."""
     try:
         if '<svg' in h.decode().lower():
diff --git a/sphinx/util/logging.py b/sphinx/util/logging.py
index 1c480e017..dd04b3f23 100644
--- a/sphinx/util/logging.py
+++ b/sphinx/util/logging.py
@@ -12,7 +12,7 @@ import logging
 import logging.handlers
 from collections import defaultdict
 from contextlib import contextmanager
-from typing import IO, TYPE_CHECKING, Any, Dict, Generator, List, Tuple, Type, Union
+from typing import IO, TYPE_CHECKING, Any, Dict, Generator, List, Optional, Tuple, Type, Union
 
 from docutils import nodes
 from docutils.nodes import Node
@@ -353,6 +353,8 @@ def is_suppressed_warning(type: str, subtype: str, suppress_warnings: List[str])
     if type is None:
         return False
 
+    subtarget: Optional[str]
+
     for warning_type in suppress_warnings:
         if '.' in warning_type:
             target, subtarget = warning_type.split('.', 1)
@@ -506,7 +508,7 @@ class WarningLogRecordTranslator(SphinxLogRecordTranslator):
     LogRecordClass = SphinxWarningLogRecord
 
 
-def get_node_location(node: Node) -> str:
+def get_node_location(node: Node) -> Optional[str]:
     (source, line) = get_source_line(node)
     if source and line:
         return "%s:%s" % (source, line)
diff --git a/sphinx/util/matching.py b/sphinx/util/matching.py
index d33ae0333..2ed804677 100644
--- a/sphinx/util/matching.py
+++ b/sphinx/util/matching.py
@@ -9,7 +9,7 @@
 """
 
 import re
-from typing import Callable, Dict, Iterable, List, Match, Pattern
+from typing import Callable, Dict, Iterable, List, Match, Optional, Pattern
 
 from sphinx.util.osutil import canon_path
 
@@ -60,7 +60,7 @@ def _translate_pattern(pat: str) -> str:
     return res + '$'
 
 
-def compile_matchers(patterns: List[str]) -> List[Callable[[str], Match[str]]]:
+def compile_matchers(patterns: List[str]) -> List[Callable[[str], Optional[Match[str]]]]:
     return [re.compile(_translate_pattern(pat)).match for pat in patterns]
 
 
@@ -89,7 +89,7 @@ DOTFILES = Matcher(['**/.*'])
 _pat_cache = {}  # type: Dict[str, Pattern]
 
 
-def patmatch(name: str, pat: str) -> Match[str]:
+def patmatch(name: str, pat: str) -> Optional[Match[str]]:
     """Return if name matches pat.  Adapted from fnmatch module."""
     if pat not in _pat_cache:
         _pat_cache[pat] = re.compile(_translate_pattern(pat))
diff --git a/sphinx/util/tags.py b/sphinx/util/tags.py
index c50231220..cf3d53400 100644
--- a/sphinx/util/tags.py
+++ b/sphinx/util/tags.py
@@ -22,7 +22,7 @@ class BooleanParser(Parser):
     """
 
     def parse_compare(self) -> Node:
-        node = None  # type: Node
+        node: Node
         token = self.stream.current
         if token.type == 'name':
             if token.value in ('true', 'false', 'True', 'False'):