diff --git a/src/utils/unwrapWritableDraft.ts b/src/utils/unwrapWritableDraft.ts
new file mode 100644
index 0000000..70f2576
--- /dev/null
+++ b/src/utils/unwrapWritableDraft.ts
@@ -0,0 +1,11 @@
+import type * as immerTypesExternal from "immer/dist/types/types-external";
+
+export type { immerTypesExternal };
+
+export type UnwrapWritableDraft<T> = T extends immerTypesExternal.WritableDraft<infer U> ? U : never;
+
+export function unwrapWritableDraft<T extends immerTypesExternal.WritableDraft<any>>(
+    wrapped: T
+): UnwrapWritableDraft<T> {
+    return wrapped as any;
+}