diff --git a/js/common/Transpiler.js b/js/common/Transpiler.js
index 7c26868ef..45ee149cd 100644
--- a/js/common/Transpiler.js
+++ b/js/common/Transpiler.js
@@ -19,6 +19,7 @@ const CacheLayer = require( './CacheLayer' );
 const wgslMinify = require( './wgslMinify' );
 const wgslPreprocess = require( './wgslPreprocess' );
 const wgslStripComments = require( './wgslStripComments' );
+const webpackGlobalLibraries = require( './webpackGlobalLibraries' );
 const core = require( '@babel/core' );
 const assert = require( 'assert' );
 const _ = require( 'lodash' );
@@ -315,8 +316,10 @@ class Transpiler {
 
       // Our sims load this as a module rather than a preload, so we must transpile it
       this.visitFile( Transpiler.join( '..', repo, 'lib', 'game-up-camera-1.0.0.js' ) );
-      this.visitFile( Transpiler.join( '..', repo, 'lib', 'peggy-3.0.2.js' ) );
-      this.visitFile( Transpiler.join( '..', repo, 'lib', 'himalaya-1.1.0.js' ) );
+      Object.keys( webpackGlobalLibraries ).forEach( key => {
+        const libraryFilePath = webpackGlobalLibraries[ key ];
+        this.visitFile( Transpiler.join( '..', ...libraryFilePath.split( '/' ) ) );
+      } );
     }
     else if ( repo === 'brand' ) {
       this.visitDirectory( Transpiler.join( '..', repo, 'phet' ) );
diff --git a/js/common/webpackGlobalLibraries.js b/js/common/webpackGlobalLibraries.js
index f97c36ec3..ea389c2c7 100644
--- a/js/common/webpackGlobalLibraries.js
+++ b/js/common/webpackGlobalLibraries.js
@@ -1,14 +1,25 @@
 // Copyright 2023, University of Colorado Boulder
 
 /**
- * webpackGlobalLibraries defined the third party library files that load with a global.
+ * webpackGlobalLibraries define the third party library files that load with a global. These must be here to support
+ * building sims through webpack.
+ * When adding to this file, note that it is most likely tested against the resource located in chipper/dist, so
+ * full paths are less than ideal.
  *
  * @author Michael Kauzmann (PhET Interactive Simulations)
  */
 
-
-// TODO: regex is less than ideal here, but Rule.test is a bit finicky, see https://github.com/phetsims/chipper/issues/1409
-module.exports = {
-  peggy: /sherpa[\\/]lib[\\/]peggy-3\.0\.2\.js$/, // `sherpa/lib/peggy-3.0.2.js` with windows path support
-  himalaya: /sherpa[\\/]lib[\\/]himalaya-1\.1\.0\.js$/ // `sherpa/lib/himalaya-1.1.0.js` with windows path support
+const assert = require( 'assert' );
+const webpackGlobalLibraries = {
+  peggy: 'sherpa/lib/peggy-3.0.2.js',
+  himalaya: 'sherpa/lib/himalaya-1.1.0.js'
 };
+
+Object.keys( webpackGlobalLibraries ).forEach( key => {
+  const filePath = webpackGlobalLibraries[ key ];
+
+  // If you need to support from another repo, just add to this assertion
+  assert( filePath.startsWith( 'sherpa' ), 'Path must start with the repo to support transpiling, see Transpiler' );
+} );
+
+module.exports = webpackGlobalLibraries;
diff --git a/js/grunt/webpackBuild.js b/js/grunt/webpackBuild.js
index 6c53fc9cc..75bc36647 100644
--- a/js/grunt/webpackBuild.js
+++ b/js/grunt/webpackBuild.js
@@ -33,7 +33,9 @@ for ( const repo of activeRepos ) {
 const getModuleRules = function getModuleRules() {
   return Object.keys( webpackGlobalLibraries ).map( globalKey => {
     return {
-      test: webpackGlobalLibraries[ globalKey ],
+
+      // path.join to normalize on the right path separator, perhaps there is another way?!
+      test: fileName => fileName.includes( path.join( webpackGlobalLibraries[ globalKey ] ) ),
       loader: '../chipper/node_modules/expose-loader',
       options: {
         exposes: globalKey