1 files changed, 10 insertions, 1 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index cce578b60..bd10e5474 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -4,7 +4,7 @@ import { autoObject, SerializationHelper, Deserializable } from "../client/util/
 import { Utils } from "../Utils";
 import { DocServer } from "../client/DocServer";
 import { setter, getter, getField } from "./util";
-import { Cast, ToConstructor, PromiseValue } from "./Types";
+import { Cast, ToConstructor, PromiseValue, FieldValue } from "./Types";
 
 export type FieldId = string;
 export const HandleUpdate = Symbol("HandleUpdate");
@@ -93,6 +93,15 @@ export namespace Doc {
             proto[key] = value;
         }
     }
+    export function GetAllPrototypes(doc: Doc): Doc[] {
+        const protos: Doc[] = [];
+        let d: Opt<Doc> = doc;
+        while (d) {
+            protos.push(d);
+            d = FieldValue(d.proto);
+        }
+        return protos;
+    }
     export function assign<K extends string>(doc: Doc, fields: Partial<Record<K, Opt<Field>>>) {
         for (const key in fields) {
             if (fields.hasOwnProperty(key)) {