GraphQLScalarType: default 'parse_literal' should handle variables

Replicates graphql/graphql-js@e3727fc

Author: Cito

src/graphql/type/definition.py

@@ -406,14 +406,14 @@ def parse_value(value: Any) -> Any:
         return value
 
     def parse_literal(
-        self, node: ValueNode, _variables: Optional[Dict[str, Any]] = None
+        self, node: ValueNode, variables: Optional[Dict[str, Any]] = None
     ) -> Any:
         """Parses an externally provided literal value to use as an input.
 
         This default method uses the parse_value method and should be replaced
         with a more specific version when creating a scalar type.
         """
-        return self.parse_value(value_from_ast_untyped(node))
+        return self.parse_value(value_from_ast_untyped(node, variables))
 
     def to_kwargs(self) -> Dict[str, Any]:
         return dict(

tests/type/test_definition.py

@@ -140,6 +140,10 @@ def use_parse_value_for_parsing_literals_if_parse_literal_omitted():
             scalar.parse_literal(parse_value('{foo: "bar"}'))
             == "parse_value: {'foo': 'bar'}"
         )
+        assert (
+            scalar.parse_literal(parse_value("{foo: { bar: $var } }"), {"var": "baz"})
+            == "parse_value: {'foo': {'bar': 'baz'}}"
+        )
 
     def accepts_a_scalar_type_with_ast_node_and_extension_ast_nodes():
         ast_node = ScalarTypeDefinitionNode()