Index: tools/webpack/packages.js
===================================================================
--- tools/webpack/packages.js	(revision 47290)
+++ tools/webpack/packages.js	(working copy)
@@ -220,6 +220,7 @@
 				'token-list',
 				'server-side-render',
 				'shortcode',
+				'warning',
 			].map( camelCaseDash ) ),
 			new CustomTemplatedPathPlugin( {
 				basename( path, data ) {