fix(runtime-dom): fix shadowRoot instanceof check in unsupported browsers (#4238)

diff --git a/packages/runtime-dom/src/index.ts b/packages/runtime-dom/src/index.ts
index f6f0cf322c4f611132d0b7ed7ee3488f8762ecd1..ed35e1293f8fe0faf38303d0813167f5e2583b3d 100644 (file)
--- a/packages/runtime-dom/src/index.ts
+++ b/packages/runtime-dom/src/index.ts
@@ -184,6 +184,7 @@ function normalizeContainer(
   }
   if (
     __DEV__ &&
+    window.ShadowRoot &&
     container instanceof window.ShadowRoot &&
     container.mode === 'closed'
   ) {