diff --git a/packages/webamp/js/resizeUtils.ts b/packages/webamp/js/resizeUtils.ts
index 5c71a9c3..d2d4bd9c 100644
--- a/packages/webamp/js/resizeUtils.ts
+++ b/packages/webamp/js/resizeUtils.ts
@@ -79,7 +79,7 @@ interface Edges {
   right?: WindowId;
 }
 
-interface Graph {
+export interface Graph {
   // TODO: Ensure this is a WindowId
   [id: string]: Edges;
 }