diff --git a/js/demo/sim-like-components/model/BoxOfBalls.js b/js/demo/sim-like-components/model/BoxOfBalls.js
index 238f220b..f2873472 100644
--- a/js/demo/sim-like-components/model/BoxOfBalls.js
+++ b/js/demo/sim-like-components/model/BoxOfBalls.js
@@ -1,5 +1,7 @@
 // Copyright 2018-2022, University of Colorado Boulder
 
+// @ts-nocheck
+
 /**
  * model of a box containing moving balls that bounce off the walls
  */