diff --git a/src/json-crdt/__demos__/issue-801.ts b/src/json-crdt/__demos__/issue-801.ts
new file mode 100644
index 0000000000..62ff82c2cd
--- /dev/null
+++ b/src/json-crdt/__demos__/issue-801.ts
@@ -0,0 +1,45 @@
+/* tslint:disable no-console */
+
+/**
+ * Run this demo with:
+ *
+ *     npx nodemon -q -x ts-node src/json-crdt/__demos__/issue-801.ts
+ * 
+ * @see issue: https://github.com/streamich/json-joy/issues/801
+ */
+
+// Original source:
+//
+// interface SimpleObjectI {
+//   text: string
+// }
+// const SimpleObjectSchema = s.obj({
+//   text: s.con(''),
+// })
+// const model = Model.create().setSchema(SimpleObjectSchema)
+// const root: SimpleObjectI = {
+//   text: 'foo'
+// }
+// model.api.root(root)
+// type SimpleObjectNodeType =  ObjNode<{
+//   text: ConNode<string>
+// }>
+// function foo(_node: ObjApi<SimpleObjectNodeType>) {}
+// foo(model.api.node)
+
+
+import {JsonNodeView, Model} from '..';
+import {s} from '../../json-crdt-patch';
+import {SchemaToJsonNode} from '../schema/types';
+
+const SimpleObjectSchema = s.obj({
+  text: s.con<string>('foo'),
+});
+
+const model = Model.create(SimpleObjectSchema);
+
+type SimpleObjectNodeType = SchemaToJsonNode<typeof SimpleObjectSchema>;
+type SimpleObjectI = JsonNodeView<SimpleObjectNodeType>;
+// type SimpleObjectI = ReturnType<(typeof model)['view']>;
+
+console.log(model + '');