diff --git a/src/notebook/controller/serializer-types.ts b/src/notebook/controller/serializer-types.ts
new file mode 100644
index 0000000..41687cb
--- /dev/null
+++ b/src/notebook/controller/serializer-types.ts
@@ -0,0 +1,25 @@
+import type { ohq } from "@hpcc-js/observablehq-compiler";
+
+export interface WUOutput {
+    configuration: string;
+    wuid: string;
+    results: { [id: string]: object };
+}
+
+export interface OJSCell {
+    nodeId: string | number;
+    ojsSource: string;
+}
+
+export interface OJSOutput {
+    notebookId: string;
+    folder: string;
+    files: ohq.File[], // notebook: ohq.Notebook;
+    cell: OJSCell;
+    otherCells: OJSCell[];
+}
+
+export interface Meta {
+    notebook: { [id: string]: ohq.Notebook },
+    node: { [id: string | number]: ohq.Node }
+}