Add referencing.jsonschema.EMPTY_REGISTRY.

It's just Registry() but with a SchemaRegistry annotation.

Author: Julian

docs/changes.rst

@@ -2,6 +2,11 @@
 Changelog
 =========
 
+v0.31.0
+-------
+
+* Add ``referencing.jsonschema.EMPTY_REGISTRY`` (which simply has a convenient type annotation, but otherwise is just ``Registry()``).
+
 v0.30.2
 -------
 

pyproject.toml

@@ -120,6 +120,8 @@ ignore = [
   "D407",
   # Plz spaces after section headers
   "D412",
+  # Not sure what heuristic this uses, but it seems easy for it to be wrong.
+  "SIM300",
   # We support 3.8 + 3.9
   "UP007",
 ]

referencing/jsonschema.py

@@ -21,6 +21,9 @@
 #: A JSON Schema Registry
 SchemaRegistry = Registry[Schema]
 
+#: The empty JSON Schema Registry
+EMPTY_REGISTRY: SchemaRegistry = Registry()
+
 
 @frozen
 class UnknownDialect(Exception):

referencing/tests/test_jsonschema.py

@@ -376,3 +376,7 @@ def test_multiple_lookup_recursive_ref_with_nonrecursive_ref():
     resolver = second.resolver.lookup("bar").resolver
     fourth = referencing.jsonschema.lookup_recursive_ref(resolver=resolver)
     assert fourth.contents == two.contents
+
+
+def test_empty_registry():
+    assert referencing.jsonschema.EMPTY_REGISTRY == Registry()