Fix mypy violations

sphinx/environment/__init__.py

@@ -52,6 +52,7 @@ from sphinx.environment.adapters.toctree import TocTree
 if False:
     # For type annotation
     from typing import Any, Callable, Dict, IO, Iterator, List, Pattern, Set, Tuple, Type, Union  # NOQA
+    from docutils import nodes  # NOQA
     from sphinx.application import Sphinx  # NOQA
     from sphinx.builders import Builder  # NOQA
     from sphinx.config import Config  # NOQA

sphinx/transforms/post_transforms.py

@@ -19,8 +19,9 @@ from sphinx.util import logging
 
 if False:
     # For type annotation
-    from typing import Any, Dict  # NOQA
+    from typing import Any, Dict, List, Tuple  # NOQA
     from sphinx.application import Sphinx  # NOQA
+    from sphinx.domains import Domain  # NOQA
 
 
 logger = logging.getLogger(__name__)