check for ServiceWorker (#42)

deephaven · Jun 5, 2024 · 657b497 · 657b497
1 parent 5229be7
commit 657b497
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/widget.ts b/src/widget.ts
@@ -117,7 +117,8 @@ export class DeephavenView extends DOMWidgetView {
     if (
       source == null ||
       source instanceof MessagePort ||
-      source instanceof ServiceWorker ||
+      (typeof ServiceWorker !== 'undefined' &&
+        source instanceof ServiceWorker) ||
       source !== this.iframe.contentWindow
     ) {
       log.debug('Ignore message, invalid event source', source);