fix: prevent crash on jsdom when preloading CSSOM (#3754)

* fix: prevent crash on jsdom - cssom package does not implement StyleSheet.media * trigger build? Co-authored-by: Steven Lambert <steven.lambert@deque.com>
dequelabs · Nov 1, 2022 · b1f0c6b · b1f0c6b
1 parent b74c5d4
commit b1f0c6b
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/lib/core/utils/preload-cssom.js b/lib/core/utils/preload-cssom.js
@@ -187,9 +187,13 @@ function getStylesheetsFromDocumentFragment(rootNode, convertDataToStylesheet) {
  * @returns {Array<Object>}
  */
 function getStylesheetsFromDocument(rootNode) {
-  return Array.from(rootNode.styleSheets).filter(sheet =>
-    filterMediaIsPrint(sheet.media.mediaText)
-  );
+  return Array.from(rootNode.styleSheets).filter(sheet => {
+    if (!sheet.media) {
+      return false;
+    }
+
+    return filterMediaIsPrint(sheet.media.mediaText);
+  });
 }
 
 /**