From 33a30c38c95906395b397eaf75acc1c21d1e3f96 Mon Sep 17 00:00:00 2001
From: Michael Kauzmann <michael.kauzmann@colorado.edu>
Date: Thu, 22 Aug 2024 15:40:45 -0600
Subject: [PATCH] Reapply "referenceIO.toStateObject asserts instrumentation,
 https://github.com/phetsims/tandem/issues/312"

This reverts commit 2fbf982207875b05d3441a8da059b0a8e7930097.
---
 js/types/ReferenceIO.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/js/types/ReferenceIO.ts b/js/types/ReferenceIO.ts
index acc47f55..afccddd5 100644
--- a/js/types/ReferenceIO.ts
+++ b/js/types/ReferenceIO.ts
@@ -15,6 +15,7 @@ import IOType from './IOType.js';
 import StringIO from './StringIO.js';
 import { PhetioID } from '../TandemConstants.js';
 import IOTypeCache from '../IOTypeCache.js';
+import Tandem from '../Tandem.js';
 
 // Cache each parameterized ReferenceIO so that it is only created once
 const cache = new IOTypeCache();
@@ -41,6 +42,7 @@ const ReferenceIO = ( parameterType: IOType ): IOType => {
        * directly to use this implementation.
        */
       toStateObject( phetioObject ): ReferenceIOState {
+        assert && Tandem.VALIDATION && assert( phetioObject.isPhetioInstrumented(), 'Cannot reference an uninstrumented object', phetioObject );
 
         // NOTE: We cannot assert that phetioObject.phetioState === false here because sometimes ReferenceIO is used statically like
         // ReferenceIO( Vector2IO ).toStateObject( myVector );