Fix NewType first argument is reference

Signed-off-by: Bernát Gábor <bgabor8@bloomberg.net>

Author: gaborbernat

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 1.13.1
+
+- Fixed ``NewType`` inserts a reference as first argument instead of a string
+
 ## 1.13.0
 
 - Dropped Python 3.6 support

src/sphinx_autodoc_typehints/__init__.py

@@ -126,7 +126,7 @@ def format_annotation(annotation, fully_qualified: bool = False, simplify_option
 
     # Some types require special handling
     if full_name == "typing.NewType":
-        args_format = f"\\(:py:data:`~{annotation.__name__}`, {{}})"
+        args_format = f"\\(``{annotation.__name__}``, {{}})"
         role = "class" if sys.version_info >= (3, 10) else "func"
     elif full_name == "typing.Optional":
         args = tuple(x for x in args if x is not type(None))  # noqa: E721

tests/test_sphinx_autodoc_typehints.py

@@ -182,7 +182,7 @@ def test_parse_annotation(annotation, module, class_name, args):
         (D, ":py:class:`~%s.D`" % __name__),
         (E, ":py:class:`~%s.E`" % __name__),
         (E[int], ":py:class:`~%s.E`\\[:py:class:`int`]" % __name__),
-        (W, f':py:{"class" if PY310_PLUS else "func"}:' f"`~typing.NewType`\\(:py:data:`~W`, :py:class:`str`)"),
+        (W, f':py:{"class" if PY310_PLUS else "func"}:' f"`~typing.NewType`\\(``W``, :py:class:`str`)"),
     ],
 )
 def test_format_annotation(inv, annotation, expected_result):