Preserve strings inside Literal type annotations

Author: GeeTransit

autoapi/mappers/python/astroid_utils.py

@@ -416,7 +416,20 @@ def _resolve_annotation(annotation):
         # astroid.Index was removed in astroid v3
         if hasattr(astroid, "Index") and isinstance(slice_node, astroid.Index):
             slice_node = slice_node.value
-        if isinstance(slice_node, astroid.Tuple):
+        if value == "Literal":
+            if isinstance(slice_node, astroid.Tuple):
+                elts = slice_node.elts
+            else:
+                elts = [slice_node]
+            slice_ = ", ".join(
+                (
+                    elt.as_string()
+                    if isinstance(elt, astroid.Const)
+                    else _resolve_annotation(elt)
+                )
+                for elt in elts
+            )
+        elif isinstance(slice_node, astroid.Tuple):
             slice_ = ", ".join(_resolve_annotation(elt) for elt in slice_node.elts)
         else:
             slice_ = _resolve_annotation(slice_node)

docs/changes/423.bugfix

@@ -0,0 +1 @@
+Preserve strings inside Literal type annotations

tests/test_astroid_utils.py

@@ -209,6 +209,9 @@ def func(
             ),
             ("a: int, *args, b: str, **kwargs", "a: int, *args, b: str, **kwargs"),
             ("a: 'A'", "a: A"),
+            ("a: Literal[1]", "a: Literal[1]"),
+            ("a: Literal['x']", "a: Literal['x']"),
+            ("a: Literal['x', 'y', 'z']", "a: Literal['x', 'y', 'z']"),
         ],
     )
     def test_format_args(self, signature, expected):