1 files changed, 18 insertions, 0 deletions
diff --git a/src/new_fields/ObjectField.ts b/src/new_fields/ObjectField.ts
new file mode 100644
index 000000000..f276bfa67
--- /dev/null
+++ b/src/new_fields/ObjectField.ts
@@ -0,0 +1,18 @@
+import { Doc } from "./Doc";
+import { RefField } from "./RefField";
+
+export const OnUpdate = Symbol("OnUpdate");
+export const Parent = Symbol("Parent");
+export const Copy = Symbol("Copy");
+
+export abstract class ObjectField {
+    protected [OnUpdate](diff?: any) { };
+    private [Parent]?: RefField | ObjectField;
+    abstract [Copy](): ObjectField;
+}
+
+export namespace ObjectField {
+    export function MakeCopy<T extends ObjectField>(field: T) {
+        return field[Copy]();
+    }
+}