1 files changed, 10 insertions, 1 deletions
diff --git a/sphinx/util/jsonimpl.py b/sphinx/util/jsonimpl.py
index 215dfe44d..08df7f570 100644
--- a/sphinx/util/jsonimpl.py
+++ b/sphinx/util/jsonimpl.py
@@ -14,28 +14,37 @@ import json
 from six import text_type
 from six.moves import UserString
 
+if False:
+    # For type annotation
+    from typing import Any, IO  # NOQA
+
 
 class SphinxJSONEncoder(json.JSONEncoder):
     """JSONEncoder subclass that forces translation proxies."""
     def default(self, obj):
+        # type: (Any) -> unicode
         if isinstance(obj, UserString):
             return text_type(obj)
         return json.JSONEncoder.default(self, obj)
 
 
 def dump(obj, fp, *args, **kwds):
+    # type: (Any, IO, Any, Any) -> None
     kwds['cls'] = SphinxJSONEncoder
-    return json.dump(obj, fp, *args, **kwds)
+    json.dump(obj, fp, *args, **kwds)
 
 
 def dumps(obj, *args, **kwds):
+    # type: (Any, Any, Any) -> unicode
     kwds['cls'] = SphinxJSONEncoder
     return json.dumps(obj, *args, **kwds)
 
 
 def load(*args, **kwds):
+    # type: (Any, Any) -> Any
     return json.load(*args, **kwds)
 
 
 def loads(*args, **kwds):
+    # type: (Any, Any) -> Any
     return json.loads(*args, **kwds)