Use typing.TYPE_CHECKING for typehints

1 files changed, 2 insertions, 3 deletions

diff --git a/sphinx/config.py b/sphinx/config.py
index 1f80ab366..4f8bf969d 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -12,7 +12,7 @@
 import re
 import traceback
 from os import path, getenv
-from typing import Any, NamedTuple, Union
+from typing import TYPE_CHECKING, Any, NamedTuple, Union
 
 from six import PY2, PY3, iteritems, string_types, binary_type, text_type, integer_types
 
@@ -23,8 +23,7 @@ from sphinx.util.i18n import format_date
 from sphinx.util.osutil import cd
 from sphinx.util.pycompat import execfile_, NoneType
 
-if False:
-    # For type annotation
+if TYPE_CHECKING:
     from typing import Any, Callable, Dict, Iterable, Iterator, List, Tuple, Union  # NOQA
     from sphinx.util.tags import Tags  # NOQA