diff --git a/js/demo/sim-like-components/model/Ball.js b/js/demo/sim-like-components/model/Ball.js
index a6e7e194..8eedfc8d 100644
--- a/js/demo/sim-like-components/model/Ball.js
+++ b/js/demo/sim-like-components/model/Ball.js
@@ -1,5 +1,5 @@
 // Copyright 2018-2021, University of Colorado Boulder
-
+// @ts-nocheck
 /**
  * simple model of a ball
  */