diff --git a/libs/hashable.py b/libs/hashable.py
new file mode 100644
index 0000000..ab9aa71
--- /dev/null
+++ b/libs/hashable.py
@@ -0,0 +1,38 @@
+import json
+from functools import total_ordering
+
+from bundlewrap.metadata import MetadataJSONEncoder
+
+
+@total_ordering
+class Hashable():
+    def _json(self):
+        return json.dumps(
+            self,
+            sort_keys=True,
+            cls=MetadataJSONEncoder,
+        )
+
+    def __lt__(self, other):
+        return self._json() < other._json()
+
+    def __eq__(self, other):
+        return self._json() == other._json()
+
+    def __hash__(self):
+        return hash(self._json())
+
+
+class HashableDict(Hashable, dict):
+    pass
+
+
+class HashableSet(Hashable, set):
+    pass
+
+
+def hashable(object):
+    return {
+        dict: HashableDict,
+        set: HashableSet,
+    }[type(object)](object)