Install polyfill when upgrade is not a function

webcomponents · Oct 17, 2023 · f8382fe · f8382fe
1 parent f91938f
commit f8382fe
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/packages/custom-elements/ts_src/custom-elements.ts b/packages/custom-elements/ts_src/custom-elements.ts
@@ -56,7 +56,8 @@ if (
   !priorCustomElements ||
   priorCustomElements['forcePolyfill'] ||
   typeof priorCustomElements['define'] != 'function' ||
-  typeof priorCustomElements['get'] != 'function'
+  typeof priorCustomElements['get'] != 'function' ||
+  typeof priorCustomElements['upgrade'] != 'function'
 ) {
   installPolyfill();
 }