fix(platform): avoid errors if ShadowRoot is not defined (angular#19124)

Fixes potential errors if the `ShadowRoot` global is undefined.
karanpopat · Apr 23, 2020 · 46babbd · 46babbd
1 parent eba622a
commit 46babbd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/cdk/platform/features/shadow-dom.ts b/src/cdk/platform/features/shadow-dom.ts
@@ -23,7 +23,9 @@ export function _getShadowRoot(element: HTMLElement): Node | null {
   if (_supportsShadowDom()) {
     const rootNode = element.getRootNode ? element.getRootNode() : null;
 
-    if (rootNode instanceof ShadowRoot) {
+    // Note that this should be caught by `_supportsShadowDom`, but some
+    // teams have been able to hit this code path on unsupported browsers.
+    if (typeof ShadowRoot !== 'undefined' && ShadowRoot && rootNode instanceof ShadowRoot) {
       return rootNode;
     }
   }