Upstream http://cl/420889188

Polymer · Apr 27, 2022 · d0d39b8 · d0d39b8
1 parent ec36597
commit d0d39b8
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/lib/legacy/legacy-data-mixin.js b/lib/legacy/legacy-data-mixin.js
@@ -180,7 +180,10 @@ const TemplatizeMixin =
     return TemplateLegacy;
   });
 
-templatize.mixin = TemplatizeMixin;
+const existingTemplatizeMixin = templatize.mixin;
+templatize.mixin = existingTemplatizeMixin ?
+    (s) => TemplatizeMixin(existingTemplatizeMixin(s)) :
+    TemplatizeMixin;
 
 console.info('LegacyDataMixin will be applied to all legacy elements.\n' +
               'Set `_legacyUndefinedCheck: true` on element class to enable.');